studies/grafik/Computergrafik-Code6/cgapplication.cpp
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9 #include "cgapplication.h"
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12 static CGApplication* activeApplication_ = 0;
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15 static int lastDragDropX_ = 0;
16 static int lastDragDropY_ = 0;
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19 CGApplication::CGApplication() {
20 assert(!activeApplication_);
21 activeApplication_ = this;
22 }
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24 CGApplication::~CGApplication() {
25 activeApplication_ = 0;
26 }
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29 void CGApplication::onInit() { }
30 void CGApplication::onButton(MouseButton button, int x, int y) { }
31 void CGApplication::onMove(int x, int y) { }
32 void CGApplication::onDrag(double dx, double dy) { }
33 void CGApplication::onKey(unsigned char key) { }
34 void CGApplication::onIdle() { }
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37 static void displayFunc() {
38 assert(activeApplication_);
39 activeApplication_->onDraw();
40 }
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43 static void reshapeFunc(int newWidth, int newHeight) {
44 assert(activeApplication_);
45 activeApplication_->onSize(newWidth, newHeight);
46 }
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49 static void mouseFunc(int button, int state, int x, int y) {
50 assert(activeApplication_);
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52 if(state == GLUT_DOWN) {
53 y = glutGet(GLenum(GLUT_WINDOW_HEIGHT)) - y;
54 if(button == GLUT_LEFT_BUTTON) {
55 activeApplication_->onButton(CGApplication::LeftMouseButton, x, y);
56 } else {
57 activeApplication_->onButton(CGApplication::RightMouseButton, x, y);
58 }
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60 lastDragDropX_ = x;
61 lastDragDropY_ = y;
62 }
63 }
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66 static void motionFunc(int x, int y) {
67 assert(activeApplication_);
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69 y = glutGet(GLenum(GLUT_WINDOW_HEIGHT)) - y;
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71 double distanceX = x - lastDragDropX_;
72 double distanceY = y - lastDragDropY_;
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74 activeApplication_->onMove(x, y);
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76 double relativeX = distanceX / GLenum(GLUT_WINDOW_WIDTH);
77 double relativeY = distanceY / GLenum(GLUT_WINDOW_HEIGHT);
78 cout << "Dragging the line: " << relativeX << "/" << relativeY << endl;
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80 activeApplication_->onDrag(relativeX, relativeY);
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82 lastDragDropX_ = x;
83 lastDragDropY_ = y;
84 }
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87 static void keyboardFunc(unsigned char key, int x, int y) {
88 assert(activeApplication_);
89 activeApplication_->onKey(key);
90 }
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94 static void idleFunc() {
95 assert(activeApplication_);
96 activeApplication_->onIdle();
97 }
98 void CGApplication::start(const char* windowTitle, bool doubleBuffering,
99 unsigned long width, unsigned long height) {
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101 glutInitDisplayMode(GLUT_RGB | (doubleBuffering ? GLUT_DOUBLE : GLUT_SINGLE));
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104 glutInitWindowSize(width, height);
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107 glutCreateWindow(windowTitle);
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111 glutDisplayFunc(displayFunc);
112 glutReshapeFunc(reshapeFunc);
113 glutMouseFunc(mouseFunc);
114 glutMotionFunc(motionFunc);
115 glutKeyboardFunc(keyboardFunc);
116 glutIdleFunc(idleFunc);
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119 glutShowWindow();
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122 onInit();
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125 glutMainLoop();
126 }
127
128 void CGApplication::swapBuffers() {
129 glutSwapBuffers();
130 }
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