Class: Magick::Draw

Inherits:
Object
  • Object
show all
Defined in:
lib/RMagick.rb,
ext/RMagick/rmmain.c

Constant Summary collapse

ALIGN_TYPE_NAMES =

Thse hashes are used to map Magick constant values to the strings used in the primitives.

{
LeftAlign.to_i => 'left',
RightAlign.to_i => 'right',
CenterAlign.to_i => 'center'
}.freeze
ANCHOR_TYPE_NAMES = 
{
StartAnchor.to_i => 'start',
MiddleAnchor.to_i => 'middle',
EndAnchor.to_i => 'end'
}.freeze
DECORATION_TYPE_NAMES = 
{
NoDecoration.to_i => 'none',
UnderlineDecoration.to_i => 'underline',
OverlineDecoration.to_i => 'overline',
LineThroughDecoration.to_i => 'line-through'
}.freeze
FONT_WEIGHT_NAMES = 
{
AnyWeight.to_i => 'all',
NormalWeight.to_i => 'normal',
BoldWeight.to_i => 'bold',
BolderWeight.to_i => 'bolder',
LighterWeight.to_i => 'lighter',
}.freeze
GRAVITY_NAMES = 
{
NorthWestGravity.to_i => 'northwest',
NorthGravity.to_i => 'north',
NorthEastGravity.to_i => 'northeast',
WestGravity.to_i => 'west',
CenterGravity.to_i => 'center',
EastGravity.to_i => 'east',
SouthWestGravity.to_i => 'southwest',
SouthGravity.to_i => 'south',
SouthEastGravity.to_i => 'southeast'
}.freeze
PAINT_METHOD_NAMES = 
{
PointMethod.to_i => 'point',
ReplaceMethod.to_i => 'replace',
FloodfillMethod.to_i => 'floodfill',
FillToBorderMethod.to_i => 'filltoborder',
ResetMethod.to_i => 'reset'
}.freeze
STRETCH_TYPE_NAMES = 
{
NormalStretch.to_i => 'normal',
UltraCondensedStretch.to_i => 'ultra-condensed',
ExtraCondensedStretch.to_i => 'extra-condensed',
CondensedStretch.to_i => 'condensed',
SemiCondensedStretch.to_i => 'semi-condensed',
SemiExpandedStretch.to_i => 'semi-expanded',
ExpandedStretch.to_i => 'expanded',
ExtraExpandedStretch.to_i => 'extra-expanded',
UltraExpandedStretch.to_i => 'ultra-expanded',
AnyStretch.to_i => 'all'
}.freeze
STYLE_TYPE_NAMES = 
{
NormalStyle.to_i => 'normal',
ItalicStyle.to_i => 'italic',
ObliqueStyle.to_i => 'oblique',
AnyStyle.to_i => 'all'
}.freeze

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Object

Method: Draw#initialize <{ info initializers }> Purpose: Initialize Draw object



1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
 
# File 'ext/RMagick/rmdraw.c', line 1191

VALUE
Draw_initialize(VALUE self)
{
    Draw *draw, *draw_options;
    volatile VALUE options;

    Data_Get_Struct(self, Draw, draw);

    options = new_DrawOptions();
    Data_Get_Struct(options, Draw, draw_options);
    draw->info = draw_options->info;
    draw_options->info = NULL;

    return self;
}

Instance Method Details

#affine(sx, rx, ry, sy, tx, ty) ⇒ Object

Apply coordinate transformations to support scaling (s), rotation ®, and translation (t). Angles are specified in radians.



211
212
213
 
# File 'lib/RMagick.rb', line 211

def affine(sx, rx, ry, sy, tx, ty)
    primitive "affine " + sprintf("%g,%g,%g,%g,%g,%g", sx, rx, ry, sy, tx, ty)
end

#annotate(image_arg, width_arg, height_arg, x_arg, y_arg, text) ⇒ Object

Method: Draw#annotate(img, w, h, x, y, text) <parms> Purpose: annotates an image with text Returns: self Notes: Additional Draw attribute methods may be called in the

optional block, which is executed in the context of an
Draw object.



745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
 
# File 'ext/RMagick/rmdraw.c', line 745

VALUE Draw_annotate(
                   VALUE self,
                   VALUE image_arg,
                   VALUE width_arg,
                   VALUE height_arg,
                   VALUE x_arg,
                   VALUE y_arg,
                   VALUE text)
{
    Draw *draw;
    Image *image;
    unsigned long width, height;
    long x, y;
    AffineMatrix keep;
    char geometry_str[50];

    // Save the affine matrix in case it is modified by
    // Draw#rotation=
    Data_Get_Struct(self, Draw, draw);
    keep = draw->info->affine;

    image_arg = rm_cur_image(image_arg);
    image = rm_check_frozen(image_arg);

    // If we have an optional parm block, run it in self's context,
    // allowing the app a chance to modify the object's attributes
    if (rb_block_given_p())
    {
        (void)rb_obj_instance_eval(0, NULL, self);
    }

    // Translate & store in Draw structure
    draw->info->text = InterpretImageProperties(NULL, image, StringValuePtr(text));
    if (!draw->info->text)
    {
        rb_raise(rb_eArgError, "no text");
    }

    // Create geometry string, copy to Draw structure, overriding
    // any previously existing value.
    width  = NUM2ULONG(width_arg);
    height = NUM2ULONG(height_arg);
    x      = NUM2LONG(x_arg);
    y      = NUM2LONG(y_arg);

    if (width == 0 && height == 0)
    {
        sprintf(geometry_str, "%+ld%+ld", x, y);
    }

    // WxH is non-zero
    else
    {
        sprintf(geometry_str, "%lux%lu%+ld%+ld", width, height, x, y);
    }

    magick_clone_string(&draw->info->geometry, geometry_str);

    (void) AnnotateImage(image, draw->info);

    magick_free(draw->info->text);
    draw->info->text = NULL;
    draw->info->affine = keep;

    rm_check_image_exception(image, RetainOnError);

    return self;
}

#arc(startX, startY, endX, endY, startDegrees, endDegrees) ⇒ Object

Draw an arc.



216
217
218
219
 
# File 'lib/RMagick.rb', line 216

def arc(startX, startY, endX, endY, startDegrees, endDegrees)
    primitive "arc " + sprintf("%g,%g %g,%g %g,%g",
                startX, startY, endX, endY, startDegrees, endDegrees)
end

#bezier(*points) ⇒ Object

Draw a bezier curve.



222
223
224
225
226
227
228
229
 
# File 'lib/RMagick.rb', line 222

def bezier(*points)
    if points.length == 0
        Kernel.raise ArgumentError, "no points specified"
    elsif points.length % 2 != 0
        Kernel.raise ArgumentError, "odd number of arguments specified"
    end
    primitive "bezier " + points.join(',')
end

#circle(originX, originY, perimX, perimY) ⇒ Object

Draw a circle



232
233
234
 
# File 'lib/RMagick.rb', line 232

def circle(originX, originY, perimX, perimY)
    primitive "circle " + sprintf("%g,%g %g,%g", originX, originY, perimX, perimY)
end

#clip_path(name) ⇒ Object

Invoke a clip-path defined by def_clip_path.



237
238
239
 
# File 'lib/RMagick.rb', line 237

def clip_path(name)
    primitive "clip-path #{name}"
end

#clip_rule(rule) ⇒ Object

Define the clipping rule.



242
243
244
245
246
247
 
# File 'lib/RMagick.rb', line 242

def clip_rule(rule)
    if ( not ["evenodd", "nonzero"].include?(rule.downcase) )
        Kernel.raise ArgumentError, "Unknown clipping rule #{rule}"
    end
    primitive "clip-rule #{rule}"
end

#clip_units(unit) ⇒ Object

Define the clip units



250
251
252
253
254
255
 
# File 'lib/RMagick.rb', line 250

def clip_units(unit)
    if ( not ["userspace", "userspaceonuse", "objectboundingbox"].include?(unit.downcase) )
        Kernel.raise ArgumentError, "Unknown clip unit #{unit}"
    end
    primitive "clip-units #{unit}"
end

#clone ⇒ Object

Method: Draw#clone Notes: see dup, init_copy



819
820
821
822
823
824
825
826
827
828
829
830
831
 
# File 'ext/RMagick/rmdraw.c', line 819

VALUE
Draw_clone(VALUE self)
{
    volatile VALUE clone;

    clone = Draw_dup(self);
    if (OBJ_FROZEN(self))
    {
        OBJ_FREEZE(clone);
    }

    return clone;
}

#color(x, y, method) ⇒ Object

Set color in image according to specified colorization rule. Rule is one of point, replace, floodfill, filltoborder,reset



259
260
261
262
263
264
 
# File 'lib/RMagick.rb', line 259

def color(x, y, method)
    if ( not PAINT_METHOD_NAMES.has_key?(method.to_i) )
        Kernel.raise ArgumentError, "Unknown PaintMethod: #{method}"
    end
    primitive "color #{x},#{y},#{PAINT_METHOD_NAMES[method.to_i]}"
end

#composite(*args) ⇒ Object

Method: Draw#composite(x,y,width,height,img,operator=OverCompositeOp) Purpose: Implement the “image” drawing primitive Notes: The “img” argument can be either an ImageList object

or an Image argument.



840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
 
# File 'ext/RMagick/rmdraw.c', line 840

VALUE
Draw_composite(int argc, VALUE *argv, VALUE self)
{
    Draw *draw;
    const char *op = "Over";
    double x, y, width, height;
    CompositeOperator cop = OverCompositeOp;
    volatile VALUE image;
    Image *comp_img;
    struct TmpFile_Name *tmpfile_name;
    char name[MaxTextExtent];
    // Buffer for "image" primitive
    char primitive[MaxTextExtent];

    if (argc < 5 || argc > 6)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 5 or 6)", argc);
    }

    // Retrieve the image to composite
    image = rm_cur_image(argv[4]);
    (void) rm_check_destroyed(image);

    x = NUM2DBL(argv[0]);
    y = NUM2DBL(argv[1]);
    width  = NUM2DBL(argv[2]);
    height = NUM2DBL(argv[3]);

    // The default composition operator is "Over".
    if (argc == 6)
    {
        VALUE_TO_ENUM(argv[5], cop, CompositeOperator);

        switch (cop)
        {
            case AddCompositeOp:
                op = "Add";
                break;
            case AtopCompositeOp:
                op = "Atop";
                break;
            case BlendCompositeOp:
                op = "Blend";
                break;
#if defined(HAVE_ENUM_BLURCOMPOSITEOP)
            case BlurCompositeOp:
                op = "Blur";
                break;
#endif
            case BumpmapCompositeOp:
                op = "Bumpmap";
                break;
            case ChangeMaskCompositeOp:
                op = "ChangeMask";
                break;
            case ClearCompositeOp:
                op = "Clear";
                break;
            case ColorBurnCompositeOp:
                op = "ColorBurn";
                break;
            case ColorDodgeCompositeOp:
                op = "ColorDodge";
                break;
            case ColorizeCompositeOp:
                op = "Colorize";
                break;
            case CopyCompositeOp:
                op = "Copy";
                break;
            case CopyBlackCompositeOp:
                op = "CopyBlack";
                break;
            case CopyBlueCompositeOp:
                op = "CopyBlue";
                break;
            case CopyCyanCompositeOp:
                op = "CopyCyan";
                break;
            case CopyGreenCompositeOp:
                op = "CopyGreen";
                break;
            case CopyMagentaCompositeOp:
                op = "CopyMagenta";
                break;
            case CopyOpacityCompositeOp:
                op = "CopyOpacity";
                break;
            case CopyRedCompositeOp:
                op = "CopyRed";
                break;
            case CopyYellowCompositeOp:
                op = "CopyYellow";
                break;
            case DarkenCompositeOp:
                op = "Darken";
                break;
#if defined(HAVE_ENUM_DISTORTCOMPOSITEOP)
            case DistortCompositeOp:
                op = "Distort";
                break;
#endif
            case DivideCompositeOp:
                op = "Divide";
                break;
            case DstCompositeOp:
                op = "Dst";
                break;
            case DstAtopCompositeOp:
                op = "DstAtop";
                break;
            case DstInCompositeOp:
                op = "DstIn";
                break;
            case DstOutCompositeOp:
                op = "DstOut";
                break;
            case DstOverCompositeOp:
                op = "DstOver";
                break;
            case DifferenceCompositeOp:
                op = "Difference";
                break;
            case DisplaceCompositeOp:
                op = "Displace";
                break;
            case DissolveCompositeOp:
                op = "Dissolve";
                break;
            case ExclusionCompositeOp:
                op = "Exclusion";
                break;
            case HardLightCompositeOp:
                op = "HardLight";
                break;
            case HueCompositeOp:
                op = "Hue";
                break;
            case InCompositeOp:
                op = "In";
                break;
            case LightenCompositeOp:
                op = "Lighten";
                break;
            case LinearLightCompositeOp:
                op = "LinearLight";
                break;
            case LuminizeCompositeOp:
                op = "Luminize";
                break;
            case MinusCompositeOp:
                op = "Minus";
                break;
            case ModulateCompositeOp:
                op = "Modulate";
                break;
            case MultiplyCompositeOp:
                op = "Multiply";
                break;
            case OutCompositeOp:
                op = "Out";
                break;
            case OverCompositeOp:
                op = "Over";
                break;
            case OverlayCompositeOp:
                op = "Overlay";
                break;
            case PlusCompositeOp:
                op = "Plus";
                break;
            case ReplaceCompositeOp:
                op = "Replace";
                break;
            case SaturateCompositeOp:
                op = "Saturate";
                break;
            case ScreenCompositeOp:
                op = "Screen";
                break;
            case SoftLightCompositeOp:
                op = "SoftLight";
                break;
            case SrcCompositeOp:
                op = "Src";
                break;
            case SrcAtopCompositeOp:
                op = "SrcAtop";
                break;
            case SrcInCompositeOp:
                op = "SrcIn";
                break;
            case SrcOutCompositeOp:
                op = "SrcOut";
                break;
            case SrcOverCompositeOp:
                op = "SrcOver";
                break;
            case SubtractCompositeOp:
                op = "Subtract";
                break;
            case ThresholdCompositeOp:
                op = "Threshold";
                break;
            case XorCompositeOp:
                op = "Xor";
                break;
            default:
                rb_raise(rb_eArgError, "unknown composite operator (%d)", cop);
                break;
        }
    }

    Data_Get_Struct(self, Draw, draw);

    // Create a temp copy of the composite image
    Data_Get_Struct(image, Image, comp_img);
    rm_write_temp_image(comp_img, name);

    // Add the temp filename to the filename array.
    // Use Magick storage since we need to keep the list around
    // until destroy_Draw is called.
    tmpfile_name = magick_malloc(sizeof(struct TmpFile_Name)+strlen(name));
    strcpy(tmpfile_name->name, name);
    tmpfile_name->next = draw->tmpfile_ary;
    draw->tmpfile_ary = tmpfile_name;

    // Form the drawing primitive
    (void) sprintf(primitive, "image %s %g,%g,%g,%g '%s'", op, x, y, width, height, name);


    // Send "primitive" to self.
    (void) rb_funcall(self, rb_intern("primitive"), 1, rb_str_new2(primitive));

    return self;
}

#decorate(decoration) ⇒ Object

Specify EITHER the text decoration (none, underline, overline, line-through) OR the text solid background color (any color name or spec)



268
269
270
271
272
273
274
 
# File 'lib/RMagick.rb', line 268

def decorate(decoration)
    if ( DECORATION_TYPE_NAMES.has_key?(decoration.to_i) )
        primitive "decorate #{DECORATION_TYPE_NAMES[decoration.to_i]}"
    else
        primitive "decorate #{enquote(decoration)}"
    end
end

#define_clip_path(name) ⇒ Object

Define a clip-path. A clip-path is a sequence of primitives bracketed by the “push clip-path <name>” and “pop clip-path” primitives. Upon advice from the IM guys, we also bracket the clip-path primitives with “push(pop) defs” and “push (pop) graphic-context”.



281
282
283
284
285
286
287
288
289
290
291
292
 
# File 'lib/RMagick.rb', line 281

def define_clip_path(name)
    begin
        push('defs')
        push('clip-path', name)
        push('graphic-context')
        yield
    ensure
        pop('graphic-context')
        pop('clip-path')
        pop('defs')
    end
end

#draw(image_arg) ⇒ Object

Method: Draw#draw(i) Purpose: Execute the stored drawing primitives on the current image

image



1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
 
# File 'ext/RMagick/rmdraw.c', line 1083

VALUE
Draw_draw(VALUE self, VALUE image_arg)
{
    Draw *draw;
    Image *image;

    image_arg = rm_cur_image(image_arg);
    image = rm_check_frozen(image_arg);

    Data_Get_Struct(self, Draw, draw);
    if (draw->primitives == 0)
    {
        rb_raise(rb_eArgError, "nothing to draw");
    }

    // Point the DrawInfo structure at the current set of primitives.
    magick_clone_string(&(draw->info->primitive), StringValuePtr(draw->primitives));

    (void) DrawImage(image, draw->info);
    rm_check_image_exception(image, RetainOnError);

    magick_free(draw->info->primitive);
    draw->info->primitive = NULL;

    return self;
}

#dup ⇒ Object

Methods: Draw#dup Purpose: Copy a Draw object Notes: Constructs a new Draw object, then calls initialize_copy



1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
 
# File 'ext/RMagick/rmdraw.c', line 1116

VALUE
Draw_dup(VALUE self)
{
    Draw *draw;
    volatile VALUE dup;

    draw = ALLOC(Draw);
    memset(draw, 0, sizeof(Draw));
    dup = Data_Wrap_Struct(CLASS_OF(self), mark_Draw, destroy_Draw, draw);
    if (rb_obj_tainted(self))
    {
        (void)rb_obj_taint(dup);
    }
    return rb_funcall(dup, rm_ID_initialize_copy, 1, self);
}

#ellipse(originX, originY, width, height, arcStart, arcEnd) ⇒ Object

Draw an ellipse



295
296
297
298
 
# File 'lib/RMagick.rb', line 295

def ellipse(originX, originY, width, height, arcStart, arcEnd)
    primitive "ellipse " + sprintf("%g,%g %g,%g %g,%g",
                    originX, originY, width, height, arcStart, arcEnd)
end

#encoding(encoding) ⇒ Object

Let anything through, but the only defined argument is “UTF-8”. All others are apparently ignored.



302
303
304
 
# File 'lib/RMagick.rb', line 302

def encoding(encoding)
    primitive "encoding #{encoding}"
end

#fill(colorspec) ⇒ Object Also known as: fill_color, fill_pattern

Specify object fill, a color name or pattern name



307
308
309
 
# File 'lib/RMagick.rb', line 307

def fill(colorspec)
    primitive "fill #{enquote(colorspec)}"
end

#fill_opacity(opacity) ⇒ Object

Specify fill opacity (use “xx%” to indicate percentage)



314
315
316
 
# File 'lib/RMagick.rb', line 314

def fill_opacity(opacity)
    primitive "fill-opacity #{opacity}"
end

#fill_rule(rule) ⇒ Object 



318
319
320
321
322
323
 
# File 'lib/RMagick.rb', line 318

def fill_rule(rule)
    if ( not ["evenodd", "nonzero"].include?(rule.downcase) )
        Kernel.raise ArgumentError, "Unknown fill rule #{rule}"
    end
    primitive "fill-rule #{rule}"
end

#font(name) ⇒ Object

Specify text drawing font



326
327
328
 
# File 'lib/RMagick.rb', line 326

def font(name)
    primitive "font #{name}"
end

#font_family(name) ⇒ Object 



330
331
332
 
# File 'lib/RMagick.rb', line 330

def font_family(name)
    primitive "font-family \'#{name}\'"
end

#font_stretch(stretch) ⇒ Object 



334
335
336
337
338
339
 
# File 'lib/RMagick.rb', line 334

def font_stretch(stretch)
    if ( not STRETCH_TYPE_NAMES.has_key?(stretch.to_i) )
        Kernel.raise ArgumentError, "Unknown stretch type"
    end
    primitive "font-stretch #{STRETCH_TYPE_NAMES[stretch.to_i]}"
end

#font_style(style) ⇒ Object 



341
342
343
344
345
346
 
# File 'lib/RMagick.rb', line 341

def font_style(style)
    if ( not STYLE_TYPE_NAMES.has_key?(style.to_i) )
        Kernel.raise ArgumentError, "Unknown style type"
    end
    primitive "font-style #{STYLE_TYPE_NAMES[style.to_i]}"
end

#font_weight(weight) ⇒ Object

The font weight argument can be either a font weight constant or [100,200,…,900]



350
351
352
353
354
355
356
 
# File 'lib/RMagick.rb', line 350

def font_weight(weight)
    if ( FONT_WEIGHT_NAMES.has_key?(weight.to_i) )
        primitive "font-weight #{FONT_WEIGHT_NAMES[weight.to_i]}"
    else
        primitive "font-weight #{weight}"
    end
end

#get_multiline_type_metrics(*args) ⇒ Object 



1151
1152
1153
1154
1155
1156
1157
1158
 
# File 'ext/RMagick/rmdraw.c', line 1151

VALUE
Draw_get_multiline_type_metrics(
                               int argc,
                               VALUE *argv,
                               VALUE self)
{
    return get_type_metrics(argc, argv, self, GetMultilineTypeMetrics);
}

#get_type_metrics(*args) ⇒ Object

Method: Draw#get_type_metrics([image, ]text)

Draw#get_multiline_type_metrics([image, ]text)

Purpose: returns measurements for a given font and text string Notes: If the image argument has been omitted, use a dummy

image, but make sure the text has none of the special
characters that refer to image attributes.



1141
1142
1143
1144
1145
1146
1147
1148
 
# File 'ext/RMagick/rmdraw.c', line 1141

VALUE
Draw_get_type_metrics(
                     int argc,
                     VALUE *argv,
                     VALUE self)
{
    return get_type_metrics(argc, argv, self, GetTypeMetrics);
}

#gravity(grav) ⇒ Object

Specify the text positioning gravity, one of: NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast



360
361
362
363
364
365
 
# File 'lib/RMagick.rb', line 360

def gravity(grav)
    if ( not GRAVITY_NAMES.has_key?(grav.to_i) )
        Kernel.raise ArgumentError, "Unknown text positioning gravity"
    end
    primitive "gravity #{GRAVITY_NAMES[grav.to_i]}"
end

#initialize_copy(orig) ⇒ Object

Method: Draw#initialize_copy Purpose: initialize clone, dup methods



1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
 
# File 'ext/RMagick/rmdraw.c', line 1165

VALUE Draw_init_copy(VALUE self, VALUE orig)
{
    Draw *copy, *original;

    Data_Get_Struct(orig, Draw, original);
    Data_Get_Struct(self, Draw, copy);

    copy->info = CloneDrawInfo(NULL, original->info);
    if (!copy->info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }

    if (original->primitives)
    {
        copy->primitives = rb_str_dup(original->primitives);
    }

    return self;
}

#inspect ⇒ Object

Method: inspect Purpose: display the primitives



1212
1213
1214
1215
1216
1217
1218
1219
 
# File 'ext/RMagick/rmdraw.c', line 1212

VALUE
Draw_inspect(VALUE self)
{
    Draw *draw;

    Data_Get_Struct(self, Draw, draw);
    return draw->primitives ? draw->primitives : rb_str_new2("(no primitives defined)");
}

#interword_spacing(space) ⇒ Object

IM 6.4.8-3 and later



368
369
370
371
372
373
374
375
376
377
 
# File 'lib/RMagick.rb', line 368

def interword_spacing(space)
    begin
        Float(space)
    rescue ArgumentError
        Kernel.raise ArgumentError, "invalid value for interword_spacing"
    rescue TypeError
        Kernel.raise TypeError, "can't convert #{space.class} into Float"
    end
    primitive "interword-spacing #{space}"
end

#kerning(space) ⇒ Object

IM 6.4.8-3 and later



380
381
382
383
384
385
386
387
388
389
 
# File 'lib/RMagick.rb', line 380

def kerning(space)
    begin
        Float(space)
    rescue ArgumentError
        Kernel.raise ArgumentError, "invalid value for kerning"
    rescue TypeError
        Kernel.raise TypeError, "can't convert #{space.class} into Float"
    end
    primitive "kerning #{space}"
end

#line(startX, startY, endX, endY) ⇒ Object

Draw a line



392
393
394
 
# File 'lib/RMagick.rb', line 392

def line(startX, startY, endX, endY)
    primitive "line " + sprintf("%g,%g %g,%g", startX, startY, endX, endY)
end

#marshal_dump ⇒ Object

Method: Draw#marshal_dump Purpose: Custom marshal for Draw objects Notes: Instead of trying to replicate Ruby’s support for cross-system

marshalling, exploit it. Convert the Draw fields to Ruby objects
and store them in a hash. Let Ruby marshal the hash.

Commented out code that dumps/loads fields that are used internally
by ImageMagick and shouldn't be marshaled. I left the code as
placeholders so I'll know which fields have been deliberately
omitted.

To do: Handle gradients when christy gets the new gradient support added (23Dec08)



418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
 
# File 'ext/RMagick/rmdraw.c', line 418

VALUE
Draw_marshal_dump(VALUE self)
{
    Draw *draw;
    VALUE ddraw;

    Data_Get_Struct(self, Draw, draw);

    // Raise an exception if the Draw has a non-NULL gradient or element_reference field
    if (draw->info->element_reference.type != UndefinedReference
        || draw->info->gradient.type != UndefinedGradient)
    {
        rb_raise(rb_eTypeError, "can't dump gradient definition");
    }

    ddraw = rb_hash_new();

    // rb_hash_aset(ddraw, CSTR2SYM("primitive"), MAGICK_STRING_TO_OBJ(draw->info->primitive)); internal
    // rb_hash_aset(ddraw, CSTR2SYM("geometry"), MAGICK_STRING_TO_OBJ(draw->info->geometry)); set by "text" primitive
    // rb_hash_aset(ddraw, CSTR2SYM("viewbox"), Import_RectangleInfo(&draw->info->viewbox)); internal
    rb_hash_aset(ddraw, CSTR2SYM("affine"), Import_AffineMatrix(&draw->info->affine));
    rb_hash_aset(ddraw, CSTR2SYM("gravity"), INT2FIX(draw->info->gravity));
    rb_hash_aset(ddraw, CSTR2SYM("fill"), Pixel_from_PixelPacket(&draw->info->fill));
    rb_hash_aset(ddraw, CSTR2SYM("stroke"), Pixel_from_PixelPacket(&draw->info->stroke));
    rb_hash_aset(ddraw, CSTR2SYM("stroke_width"), rb_float_new(draw->info->stroke_width));
    // rb_hash_aset(ddraw, CSTR2SYM("gradient"), Qnil);  // not used yet
    rb_hash_aset(ddraw, CSTR2SYM("fill_pattern"), image_to_str(draw->info->fill_pattern));
    rb_hash_aset(ddraw, CSTR2SYM("tile"), Qnil); // deprecated
    rb_hash_aset(ddraw, CSTR2SYM("stroke_pattern"), image_to_str(draw->info->stroke_pattern));
    rb_hash_aset(ddraw, CSTR2SYM("stroke_antialias"), draw->info->stroke_antialias ? Qtrue : Qfalse);
    rb_hash_aset(ddraw, CSTR2SYM("text_antialias"), draw->info->text_antialias ? Qtrue : Qfalse);
    // rb_hash_aset(ddraw, CSTR2SYM("fill_rule"), INT2FIX(draw->info->fill_rule)); internal
    // rb_hash_aset(ddraw, CSTR2SYM("linecap"), INT2FIX(draw->info->linecap));
    // rb_hash_aset(ddraw, CSTR2SYM("linejoin"), INT2FIX(draw->info->linejoin));
    // rb_hash_aset(ddraw, CSTR2SYM("miterlimit"), ULONG2NUM(draw->info->miterlimit));
    // rb_hash_aset(ddraw, CSTR2SYM("dash_offset"), rb_float_new(draw->info->dash_offset));
    rb_hash_aset(ddraw, CSTR2SYM("decorate"), INT2FIX(draw->info->decorate));
    // rb_hash_aset(ddraw, CSTR2SYM("compose"), INT2FIX(draw->info->compose)); set via "image" primitive
    // rb_hash_aset(ddraw, CSTR2SYM("text"), MAGICK_STRING_TO_OBJ(draw->info->text)); set via "text" primitive
    // rb_hash_aset(ddraw, CSTR2SYM("face"), Qnil);  internal
    rb_hash_aset(ddraw, CSTR2SYM("font"), MAGICK_STRING_TO_OBJ(draw->info->font));
    // rb_hash_aset(ddraw, CSTR2SYM("metrics"), Qnil);   internal
    rb_hash_aset(ddraw, CSTR2SYM("family"), MAGICK_STRING_TO_OBJ(draw->info->family));
    rb_hash_aset(ddraw, CSTR2SYM("style"), INT2FIX(draw->info->style));
    rb_hash_aset(ddraw, CSTR2SYM("stretch"), INT2FIX(draw->info->stretch));
    rb_hash_aset(ddraw, CSTR2SYM("weight"), ULONG2NUM(draw->info->weight));
    rb_hash_aset(ddraw, CSTR2SYM("encoding"), MAGICK_STRING_TO_OBJ(draw->info->encoding));
    rb_hash_aset(ddraw, CSTR2SYM("pointsize"), rb_float_new(draw->info->pointsize));
    rb_hash_aset(ddraw, CSTR2SYM("density"), MAGICK_STRING_TO_OBJ(draw->info->density));
    rb_hash_aset(ddraw, CSTR2SYM("align"), INT2FIX(draw->info->align));
    rb_hash_aset(ddraw, CSTR2SYM("undercolor"), Pixel_from_PixelPacket(&draw->info->undercolor));
    // rb_hash_aset(ddraw, CSTR2SYM("border_color"), Pixel_from_PixelPacket(&draw->info->border_color)); Montage and Polaroid
    // rb_hash_aset(ddraw, CSTR2SYM("server_name"), MAGICK_STRING_TO_OBJ(draw->info->server_name));
    // rb_hash_aset(ddraw, CSTR2SYM("dash_pattern"), dash_pattern_to_array(draw->info->dash_pattern)); internal
    // rb_hash_aset(ddraw, CSTR2SYM("clip_mask"), MAGICK_STRING_TO_OBJ(draw->info->clip_mask)); internal
    // rb_hash_aset(ddraw, CSTR2SYM("bounds"), Import_SegmentInfo(&draw->info->bounds)); internal
    rb_hash_aset(ddraw, CSTR2SYM("clip_units"), INT2FIX(draw->info->clip_units));
    rb_hash_aset(ddraw, CSTR2SYM("opacity"), QUANTUM2NUM(draw->info->opacity));
    // rb_hash_aset(ddraw, CSTR2SYM("render"), draw->info->render ? Qtrue : Qfalse); internal
    // rb_hash_aset(ddraw, CSTR2SYM("element_reference"), Qnil);     // not used yet
    // rb_hash_aset(ddraw, CSTR2SYM("debug"), draw->info->debug ? Qtrue : Qfalse);
#if defined(HAVE_ST_KERNING)
    rb_hash_aset(ddraw, CSTR2SYM("kerning"), rb_float_new(draw->info->kerning));
#endif
#if defined(HAVE_ST_INTERWORD_SPACING)
    rb_hash_aset(ddraw, CSTR2SYM("interword_spacing"), rb_float_new(draw->info->interword_spacing));
#endif

    // Non-DrawInfo fields
    rb_hash_aset(ddraw, CSTR2SYM("primitives"), draw->primitives);
    // rb_hash_aset(ddraw, CSTR2SYM("shadow_color"), Pixel_from_PixelPacket(&draw->shadow_color)); Polaroid-only

    return ddraw;
}

#marshal_load(ddraw) ⇒ Object

Method: Draw#marshal_load Purpose: Support Marsal.load Notes: On entry all fields are all-bits-0



499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
 
# File 'ext/RMagick/rmdraw.c', line 499

VALUE
Draw_marshal_load(VALUE self, VALUE ddraw)
{
    Draw *draw;
    Pixel *pixel;
    volatile VALUE val;

    Data_Get_Struct(self, Draw, draw);

    draw->info = magick_malloc(sizeof(DrawInfo));
    if (!draw->info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }
    GetDrawInfo(NULL, draw->info);

    OBJ_TO_MAGICK_STRING(draw->info->geometry, rb_hash_aref(ddraw, CSTR2SYM("geometry")));

    //val = rb_hash_aref(ddraw, CSTR2SYM("viewbox"));
    //Export_RectangleInfo(&draw->info->viewbox, val);

    val = rb_hash_aref(ddraw, CSTR2SYM("affine"));
    Export_AffineMatrix(&draw->info->affine, val);

    draw->info->gravity = (GravityType) FIX2INT(rb_hash_aref(ddraw, CSTR2SYM("gravity")));

    val = rb_hash_aref(ddraw, CSTR2SYM("fill"));
    Data_Get_Struct(val, Pixel, pixel);
    draw->info->fill =  *pixel;

    val = rb_hash_aref(ddraw, CSTR2SYM("stroke"));
    Data_Get_Struct(val, Pixel, pixel);
    draw->info->stroke = *pixel;

    draw->info->stroke_width = NUM2DBL(rb_hash_aref(ddraw, CSTR2SYM("stroke_width")));
    draw->info->fill_pattern = str_to_image(rb_hash_aref(ddraw, CSTR2SYM("fill_pattern")));
    draw->info->stroke_pattern = str_to_image(rb_hash_aref(ddraw, CSTR2SYM("stroke_pattern")));
    draw->info->stroke_antialias = RTEST(rb_hash_aref(ddraw, CSTR2SYM("stroke_antialias")));
    draw->info->text_antialias = RTEST(rb_hash_aref(ddraw, CSTR2SYM("text_antialias")));
    draw->info->decorate = (DecorationType) FIX2INT(rb_hash_aref(ddraw, CSTR2SYM("decorate")));
    OBJ_TO_MAGICK_STRING(draw->info->font, rb_hash_aref(ddraw, CSTR2SYM("font")));
    OBJ_TO_MAGICK_STRING(draw->info->family, rb_hash_aref(ddraw, CSTR2SYM("family")));

    draw->info->style = (StyleType) FIX2INT(rb_hash_aref(ddraw, CSTR2SYM("style")));
    draw->info->stretch = (StretchType) FIX2INT(rb_hash_aref(ddraw, CSTR2SYM("stretch")));
    draw->info->weight = NUM2ULONG(rb_hash_aref(ddraw, CSTR2SYM("weight")));
    OBJ_TO_MAGICK_STRING(draw->info->encoding, rb_hash_aref(ddraw, CSTR2SYM("encoding")));
    draw->info->pointsize = NUM2DBL(rb_hash_aref(ddraw, CSTR2SYM("pointsize")));
    OBJ_TO_MAGICK_STRING(draw->info->density, rb_hash_aref(ddraw, CSTR2SYM("density")));
    draw->info->align = (AlignType) FIX2INT(rb_hash_aref(ddraw, CSTR2SYM("align")));

    val = rb_hash_aref(ddraw, CSTR2SYM("undercolor"));
    Data_Get_Struct(val, Pixel, pixel);
    draw->info->undercolor = *pixel;

    draw->info->clip_units = FIX2INT(rb_hash_aref(ddraw, CSTR2SYM("clip_units")));
    draw->info->opacity = NUM2QUANTUM(rb_hash_aref(ddraw, CSTR2SYM("opacity")));
#if defined(HAVE_ST_KERNING)
    draw->info->kerning = NUM2DBL(rb_hash_aref(ddraw, CSTR2SYM("kerning")));
#endif
#if defined(HAVE_ST_INTERWORD_SPACING)
    draw->info->interword_spacing = NUM2DBL(rb_hash_aref(ddraw, CSTR2SYM("interword_spacing")));
#endif

    draw->primitives = rb_hash_aref(ddraw, CSTR2SYM("primitives"));

    return self;
}

#matte(x, y, method) ⇒ Object

Set matte (make transparent) in image according to the specified colorization rule



398
399
400
401
402
403
 
# File 'lib/RMagick.rb', line 398

def matte(x, y, method)
    if ( not PAINT_METHOD_NAMES.has_key?(method.to_i) )
        Kernel.raise ArgumentError, "Unknown paint method"
    end
    primitive "matte #{x},#{y} #{PAINT_METHOD_NAMES[method.to_i]}"
end

#opacity(opacity) ⇒ Object

Specify drawing fill and stroke opacities. If the value is a string ending with a %, the number will be multiplied by 0.01.



407
408
409
410
411
412
413
414
 
# File 'lib/RMagick.rb', line 407

def opacity(opacity)
    if (Numeric === opacity)
        if (opacity < 0 || opacity > 1.0)
            Kernel.raise ArgumentError, "opacity must be >= 0 and <= 1.0"
        end
    end
    primitive "opacity #{opacity}"
end

#path(cmds) ⇒ Object

Draw using SVG-compatible path drawing commands. Note that the primitive requires that the commands be surrounded by quotes or apostrophes. Here we simply use apostrophes.



419
420
421
 
# File 'lib/RMagick.rb', line 419

def path(cmds)
    primitive "path '" + cmds + "'"
end

#pattern(name, x, y, width, height) ⇒ Object

Define a pattern. In the block, call primitive methods to draw the pattern. Reference the pattern by using its name as the argument to the ‘fill’ or ‘stroke’ methods



426
427
428
429
430
431
432
433
434
435
436
437
 
# File 'lib/RMagick.rb', line 426

def pattern(name, x, y, width, height)
    begin
        push('defs')
        push("pattern #{name} #{x} #{y} #{width} #{height}")
        push('graphic-context')
        yield
    ensure
        pop('graphic-context')
        pop('pattern')
        pop('defs')
    end
end

#point(x, y) ⇒ Object

Set point to fill color.



440
441
442
 
# File 'lib/RMagick.rb', line 440

def point(x, y)
    primitive "point #{x},#{y}"
end

#pointsize(points) ⇒ Object Also known as: font_size

Specify the font size in points. Yes, the primitive is “font-size” but in other places this value is called the “pointsize”. Give it both names.



446
447
448
 
# File 'lib/RMagick.rb', line 446

def pointsize(points)
    primitive "font-size #{points}"
end

#polygon(*points) ⇒ Object

Draw a polygon



452
453
454
455
456
457
458
459
 
# File 'lib/RMagick.rb', line 452

def polygon(*points)
    if points.length == 0
        Kernel.raise ArgumentError, "no points specified"
    elsif points.length % 2 != 0
        Kernel.raise ArgumentError, "odd number of points specified"
    end
    primitive "polygon " + points.join(',')
end

#polyline(*points) ⇒ Object

Draw a polyline



462
463
464
465
466
467
468
469
 
# File 'lib/RMagick.rb', line 462

def polyline(*points)
    if points.length == 0
        Kernel.raise ArgumentError, "no points specified"
    elsif points.length % 2 != 0
        Kernel.raise ArgumentError, "odd number of points specified"
    end
    primitive "polyline " + points.join(',')
end

#pop(*what) ⇒ Object

Return to the previously-saved set of whatever pop(‘graphic-context’) (the default if no arguments) pop(‘defs’) pop(‘gradient’) pop(‘pattern’)



477
478
479
480
481
482
483
484
 
# File 'lib/RMagick.rb', line 477

def pop(*what)
    if what.length == 0
        primitive "pop graphic-context"
    else
        # to_s allows a Symbol to be used instead of a String
        primitive "pop " + what.map {|w| w.to_s}.join(' ')
    end
end

#primitive(primitive) ⇒ Object

Method: Draw#primitive Purpose: Add a drawing primitive to the list of primitives in the

Draw object



1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
 
# File 'ext/RMagick/rmdraw.c', line 1245

VALUE
Draw_primitive(VALUE self, VALUE primitive)
{
    Draw *draw;

    rb_check_frozen(self);
    Data_Get_Struct(self, Draw, draw);

    if (draw->primitives == (VALUE)0)
    {
        draw->primitives = primitive;
    }
    else
    {
        draw->primitives = rb_str_concat(draw->primitives, rb_str_new2("\n"));
        draw->primitives = rb_str_concat(draw->primitives, primitive);
    }

    return self;
}

#push(*what) ⇒ Object

Push the current set of drawing options. Also you can use push(‘graphic-context’) (the default if no arguments) push(‘defs’) push(‘gradient’) push(‘pattern’)



491
492
493
494
495
496
497
498
 
# File 'lib/RMagick.rb', line 491

def push(*what)
    if what.length == 0
        primitive "push graphic-context"
    else
        # to_s allows a Symbol to be used instead of a String
        primitive "push " + what.map {|w| w.to_s}.join(' ')
    end
end

#rectangle(upper_left_x, upper_left_y, lower_right_x, lower_right_y) ⇒ Object

Draw a rectangle



501
502
503
504
 
# File 'lib/RMagick.rb', line 501

def rectangle(upper_left_x, upper_left_y, lower_right_x, lower_right_y)
    primitive "rectangle " + sprintf("%g,%g %g,%g",
            upper_left_x, upper_left_y, lower_right_x, lower_right_y)
end

#rotate(angle) ⇒ Object

Specify coordinate space rotation. “angle” is measured in degrees



507
508
509
 
# File 'lib/RMagick.rb', line 507

def rotate(angle)
    primitive "rotate #{angle}"
end

#roundrectangle(center_x, center_y, width, height, corner_width, corner_height) ⇒ Object

Draw a rectangle with rounded corners



512
513
514
515
 
# File 'lib/RMagick.rb', line 512

def roundrectangle(center_x, center_y, width, height, corner_width, corner_height)
    primitive "roundrectangle " + sprintf("%g,%g,%g,%g,%g,%g",
        center_x, center_y, width, height, corner_width, corner_height)
end

#scale(x, y) ⇒ Object

Specify scaling to be applied to coordinate space on subsequent drawing commands.



518
519
520
 
# File 'lib/RMagick.rb', line 518

def scale(x, y)
    primitive "scale #{x},#{y}"
end

#skewx(angle) ⇒ Object 



522
523
524
 
# File 'lib/RMagick.rb', line 522

def skewx(angle)
    primitive "skewX #{angle}"
end

#skewy(angle) ⇒ Object 



526
527
528
 
# File 'lib/RMagick.rb', line 526

def skewy(angle)
    primitive "skewY #{angle}"
end

#stroke(colorspec) ⇒ Object Also known as: stroke_color, stroke_pattern

Specify the object stroke, a color name or pattern name.



531
532
533
 
# File 'lib/RMagick.rb', line 531

def stroke(colorspec)
    primitive "stroke #{enquote(colorspec)}"
end

#stroke_antialias(bool) ⇒ Object

Specify if stroke should be antialiased or not



538
539
540
541
 
# File 'lib/RMagick.rb', line 538

def stroke_antialias(bool)
    bool = bool ? '1' : '0'
    primitive "stroke-antialias #{bool}"
end

#stroke_dasharray(*list) ⇒ Object

Specify a stroke dash pattern



544
545
546
547
548
549
550
551
552
553
554
555
 
# File 'lib/RMagick.rb', line 544

def stroke_dasharray(*list)
    if list.length == 0
        primitive "stroke-dasharray none"
    else
        list.each { |x|
            if x <= 0 then
                Kernel.raise ArgumentError, "dash array elements must be > 0 (#{x} given)"
            end
        }
        primitive "stroke-dasharray #{list.join(',')}"
    end
end

#stroke_dashoffset(value = 0) ⇒ Object

Specify the initial offset in the dash pattern



558
559
560
 
# File 'lib/RMagick.rb', line 558

def stroke_dashoffset(value=0)
    primitive "stroke-dashoffset #{value}"
end

#stroke_linecap(value) ⇒ Object 



562
563
564
565
566
567
 
# File 'lib/RMagick.rb', line 562

def stroke_linecap(value)
    if ( not ["butt", "round", "square"].include?(value.downcase) )
        Kernel.raise ArgumentError, "Unknown linecap type: #{value}"
    end
    primitive "stroke-linecap #{value}"
end

#stroke_linejoin(value) ⇒ Object 



569
570
571
572
573
574
 
# File 'lib/RMagick.rb', line 569

def stroke_linejoin(value)
    if ( not ["round", "miter", "bevel"].include?(value.downcase) )
        Kernel.raise ArgumentError, "Unknown linejoin type: #{value}"
    end
    primitive "stroke-linejoin #{value}"
end

#stroke_miterlimit(value) ⇒ Object 



576
577
578
579
580
581
 
# File 'lib/RMagick.rb', line 576

def stroke_miterlimit(value)
    if (value < 1)
        Kernel.raise ArgumentError, "miterlimit must be >= 1"
    end
    primitive "stroke-miterlimit #{value}"
end

#stroke_opacity(value) ⇒ Object

Specify opacity of stroke drawing color

(use "xx%" to indicate percentage)



585
586
587
 
# File 'lib/RMagick.rb', line 585

def stroke_opacity(value)
    primitive "stroke-opacity #{value}"
end

#stroke_width(pixels) ⇒ Object

Specify stroke (outline) width in pixels.



590
591
592
 
# File 'lib/RMagick.rb', line 590

def stroke_width(pixels)
    primitive "stroke-width #{pixels}"
end

#text(x, y, text) ⇒ Object

Draw text at position x,y. Add quotes to text that is not already quoted.



595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
 
# File 'lib/RMagick.rb', line 595

def text(x, y, text)
    if text.to_s.empty?
        Kernel.raise ArgumentError, "missing text argument"
    end
    if text.length > 2 && /\A(?:\"[^\"]+\"|\'[^\']+\'|\{[^\}]+\})\z/.match(text)
        ; # text already quoted
    elsif !text['\'']
        text = '\''+text+'\''
    elsif !text['"']
        text = '"'+text+'"'
    elsif !(text['{'] || text['}'])
        text = '{'+text+'}'
    else
        # escape existing braces, surround with braces
        text = '{' +  text.gsub(/[}]/) { |b| '\\' + b } + '}'
    end
    primitive "text #{x},#{y} #{text}"
end

#text_align(alignment) ⇒ Object

Specify text alignment relative to a given point



615
616
617
618
619
620
 
# File 'lib/RMagick.rb', line 615

def text_align(alignment)
    if ( not ALIGN_TYPE_NAMES.has_key?(alignment.to_i) )
        Kernel.raise ArgumentError, "Unknown alignment constant: #{alignment}"
    end
    primitive "text-align #{ALIGN_TYPE_NAMES[alignment.to_i]}"
end

#text_anchor(anchor) ⇒ Object

SVG-compatible version of text_align



623
624
625
626
627
628
 
# File 'lib/RMagick.rb', line 623

def text_anchor(anchor)
    if ( not ANCHOR_TYPE_NAMES.has_key?(anchor.to_i) )
        Kernel.raise ArgumentError, "Unknown anchor constant: #{anchor}"
    end
    primitive "text-anchor #{ANCHOR_TYPE_NAMES[anchor.to_i]}"
end

#text_antialias(boolean) ⇒ Object

Specify if rendered text is to be antialiased.



631
632
633
634
 
# File 'lib/RMagick.rb', line 631

def text_antialias(boolean)
    boolean = boolean ? '1' : '0'
    primitive "text-antialias #{boolean}"
end

#text_undercolor(color) ⇒ Object

Specify color underneath text



637
638
639
 
# File 'lib/RMagick.rb', line 637

def text_undercolor(color)
    primitive "text-undercolor #{enquote(color)}"
end

#translate(x, y) ⇒ Object

Specify center of coordinate space to use for subsequent drawing commands.



643
644
645
 
# File 'lib/RMagick.rb', line 643

def translate(x, y)
    primitive "translate #{x},#{y}"
end