Class: OpenGLCube
Instance Method Summary collapse
- #draw_gl_scene ⇒ Object
- #idle ⇒ Object
- #init_gl_window(width = 640, height = 480) ⇒ Object
-
#initialize ⇒ OpenGLCube
constructor
A new instance of OpenGLCube.
- #keyboard(key, x, y) ⇒ Object
- #motion(x, y) ⇒ Object
- #mouse(button, state, x, y) ⇒ Object
- #passive_motion(x, y) ⇒ Object
- #reshape(width, height) ⇒ Object
Constructor Details
#initialize ⇒ OpenGLCube
Returns a new instance of OpenGLCube.
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# File 'lib/opengl-cube.rb', line 8 def initialize @mouse_left_button_down = false @mouse_right_button_down = false @mouse_pos_x = 0 @mouse_pos_y = 0 @cube_angle_x = 0 @cube_angle_y = 0 @cube_angle_z = 0 # Initliaze our GLUT code glutInit # Setup a double buffer, RGBA color, alpha components and depth buffer glutInitDisplayMode GLUT_RGB | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH glutInitWindowSize 640, 480 glutInitWindowPosition 0, 0 @window = glutCreateWindow "OpenGL Cube" glutDisplayFunc :draw_gl_scene glutReshapeFunc :reshape glutIdleFunc :idle glutKeyboardFunc :keyboard glutMouseFunc :mouse glutMotionFunc :motion glutPassiveMotionFunc :passive_motion init_gl_window 640, 480 glutMainLoop end |
Instance Method Details
#draw_gl_scene ⇒ Object
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# File 'lib/opengl-cube.rb', line 71 def draw_gl_scene # Clear the screen and depth buffer glClear GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT # Reset the view glMatrixMode GL_MODELVIEW glLoadIdentity # Move right 3 units glTranslatef 0.0, 0.0, -7.0 # Draw a cube # Rotate the cube on the X, Y and Z axis glRotatef @cube_angle_y, 0.0, 1.0, 0.0 glRotatef @cube_angle_x, 1.0, 0.0, 0.0 glRotatef @cube_angle_z, 0.0, 0.0, 1.0 # Set it to a blue color one time only glBegin GL_QUADS do # Draw the top side in green glColor3f 0.0, 1.0, 0.0 glVertex3f 1.0, 1.0, -1.0 glVertex3f -1.0, 1.0, -1.0 glVertex3f -1.0, 1.0, 1.0 glVertex3f 1.0, 1.0, 1.0 # Draw the bottom side in orange glColor3f 1.0, 0.5, 0.0 glVertex3f 1.0, -1.0, 1.0 glVertex3f -1.0, -1.0, 1.0 glVertex3f -1.0, -1.0, -1.0 glVertex3f 1.0, -1.0, -1.0 # Draw the front side in red glColor3f 1.0, 0.0, 0.0 glVertex3f 1.0, 1.0, 1.0 glVertex3f -1.0, 1.0, 1.0 glVertex3f -1.0, -1.0, 1.0 glVertex3f 1.0, -1.0, 1.0 # Draw the back side in yellow glColor3f 1.0, 1.0, 0.0 glVertex3f 1.0, -1.0, -1.0 glVertex3f -1.0, -1.0, -1.0 glVertex3f -1.0, 1.0, -1.0 glVertex3f 1.0, 1.0, -1.0 # Draw the left side in blue glColor3f 0.0, 0.0, 1.0 glVertex3f -1.0, 1.0, 1.0 glVertex3f -1.0, 1.0, -1.0 glVertex3f -1.0, -1.0, -1.0 glVertex3f -1.0, -1.0, 1.0 # Draw the right side in violet glColor3f 1.0, 0.0, 1.0 glVertex3f 1.0, 1.0, -1.0 glVertex3f 1.0, 1.0, 1.0 glVertex3f 1.0, -1.0, 1.0 glVertex3f 1.0, -1.0, -1.0 end #@pyramid_angle += 0.2 #@cube_angle -= 0.15 # Swap buffers for display glutSwapBuffers end |
#idle ⇒ Object
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# File 'lib/opengl-cube.rb', line 133 def idle glutPostRedisplay end |
#init_gl_window(width = 640, height = 480) ⇒ Object
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# File 'lib/opengl-cube.rb', line 37 def init_gl_window width = 640, height = 480 # Background color to black glClearColor 0.0, 0.0, 0.0, 0 # Enables clearing of depth buffer glClearDepth 1.0 # Set type of depth test glDepthFunc GL_LEQUAL # Enable depth testing glEnable GL_DEPTH_TEST # Enable smooth color shading glShadeModel GL_SMOOTH glMatrixMode GL_PROJECTION glLoadIdentity # Calculate aspect ratio of the window gluPerspective 45.0, width / height, 0.1, 100.0 glMatrixMode GL_MODELVIEW draw_gl_scene end |
#keyboard(key, x, y) ⇒ Object
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# File 'lib/opengl-cube.rb', line 137 def keyboard key, x, y case key when ?\e glutDestroyWindow @window exit 0 when ?a @cube_angle_y -= 15.0 when ?d @cube_angle_y += 15.0 when ?w @cube_angle_x -= 15.0 when ?s @cube_angle_x += 15.0 end glutPostRedisplay end |
#motion(x, y) ⇒ Object
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# File 'lib/opengl-cube.rb', line 183 def motion x, y if @mouse_left_button_down @cube_angle_y = @mouse_pos_x - x @cube_angle_x = @mouse_pos_y - y elsif @mouse_right_button_down @cube_angle_z = @mouse_pos_x - x end end |
#mouse(button, state, x, y) ⇒ Object
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# File 'lib/opengl-cube.rb', line 154 def mouse , state, x, y case when GLUT_LEFT_BUTTON case state when GLUT_DOWN @mouse_pos_x = x @mouse_pos_y = y @mouse_left_button_down = true when GLUT_UP @cube_angle_x = @mouse_pos_x - x @cube_angle_y = @mouse_pos_y - y @mouse_pos_x = x @mouse_pos_y = y @mouse_left_button_down = false end when GLUT_RIGHT_BUTTON case state when GLUT_DOWN @mouse_pos_x = x @mouse_pos_y = y @mouse_right_button_down = true when GLUT_UP @cube_angle_z = @mouse_pos_x - x @mouse_right_button_down = false end end glutPostRedisplay end |
#passive_motion(x, y) ⇒ Object
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# File 'lib/opengl-cube.rb', line 192 def passive_motion x, y end |
#reshape(width, height) ⇒ Object
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# File 'lib/opengl-cube.rb', line 59 def reshape width, height height = 1 if height == 0 # Reset current viewpoint and perspective transformation glViewport 0, 0, width, height glMatrixMode GL_PROJECTION glLoadIdentity gluPerspective 45.0, width / height, 0.1, 100.0 end |