OpenG实现画线段与折线.doc

#include #include #define NUM 100 /折线的最大折线段 int Flag = 0; /标记是否已经开始绘制折线 int RFlag = 0; /标记是否已经完成一个矩形 int Function = 1; /标记选择的功能是画折线还是矩形 int winWidth = 800, winHeight = 600; /窗口的宽度和高度 int x, y; /用于记录当前鼠标的位置 int n = 0; /用于记录折线有几段 int m = 0; /用于记录矩形个数 /线性结构体 struct LineNode int x1; int y1; int x2; int y2; LineNUM; /矩形结构体 struct Rectangle int x1; int y1; int x2; int y2; RectNUM; static GLsizei iMode = 1; void Initial(void) glClearColor(1.0f, 1.0f, 1.0f, 1.0f); /设置窗口背景颜色 void ChangeSize(int w, int h) /保存当前窗口的大小 winWidth = w; winHeight = h; glViewport(0, 0, w, h); /指定窗口显示区域 glMatrixMode(GL_PROJECTION); /指定设置投影参数 glLoadIdentity(); /调用单位矩阵，去掉以前的投影参数设置 gluOrtho2D(0.0, winWidth, 0.0, winHeight); /设置投影参数 void rightClik(int value) Function = value; n = 0; Flag = 0; m = 0; RFlag = 0; glutPostRedisplay(); void Display() int i, j; glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); /线性模式画图 glClear(GL_COLOR_BUFFER_BIT); /用当前背景色填充窗口 glColor3f(1.0f, 0.0f, 0.0f); /指定当前的绘图颜色 switch(Function)case 3: glClear(GL_COLOR_BUFFER_BIT); if (Function = 1) for (i = 0; i n; i+) glBegin(GL_LINES); /绘制直线段 glVertex2i(Linei.x1, Linei.y1); glVertex2i(Linei.x2, Linei.y2); glEnd(); if (Flag = 1) glBegin(GL_LINES); glVertex2i(Linei.x1, Linei.y1); glVertex2i(x, y); glEnd(); else /绘制矩形 for (j = 0; j m; j+) glRecti(Rectj.x1, Rectj.y1, Rectj.x2, Rectj.y2); /动态绘制鼠标动作 if (RFlag = 1) glRecti(Rectj.x1, Rectj.y1, x, y); glutSwapBuffers(); /交换缓冲区 void MousePlot(GLint button, GLint action, GLint xMouse, GLint yMouse) /线性 if (Function = 1) if (button = GLUT_LEFT_BUTTON & action = GLUT_DOWN) if (Flag = 0) Flag = 1; Linen.x1 = xMouse; Linen.y1 = winHeight - yMouse; else Linen.x2 = xMouse; Linen.y2 = winHeight - yMouse; n+; Linen.x1 = Linen-1.x2; Linen.y1 = Linen-1.y2; else /矩形 if (button = GLUT_LEFT_BUTTON & action = GLUT_DOWN) if (RFlag = 0) Rectm.x1 = xMouse; Rectm.y1 = winHeight - yMouse; else RFlag = 0; Rectm.x2 = xMouse; Rectm.y2 = winHeight - yMouse; m+; glutPostRedisplay(); void PassiveMouseMove(GLint xMouse, GLint yMouse) x = xMouse; y = winHeight - yMouse; glutPostRedisplay(); int main(int argc, char *argv) glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); /使用双缓存及RGB模型 glutInitWindowSize(400, 300); /指定窗口的尺寸 glutInitWindowPosition(100, 100); /指定窗口在屏幕上的位置 glutCreateWindow(橡皮筋技术); int nFunctionMenu=glutCreateMenu(rightClik); glutAddMenuEntry(画折线, 1); glutAddMenuEntry(画矩形, 2); int nMainMenu = glutCreateMenu(rightClik); glutAddSubMenu(功能,nFunctionMenu); glutAttachMenu(GLUT_RIGHT_BUTTON); /右键 glutDisplayFunc(Display); glutReshapeFunc(ChangeSize); /指定窗口再整形回调函数 glutMo