opengl_1.rar_visual c

#include <gl/glut.h> GLsizei winWidth=300; GLsizei winHeight=300; GLint pnum=0; class Point { public: GLint x,y; }; void Init() { glClearColor(1,1,1,1); glMatrixMode(GL_PROJECTION); gluOrtho2D(0,200.0,0,150.0); } void MyDisplay() { glClear(GL_COLOR_BUFFER_BIT); } void drawline(Point p1,Point p2) { glColor3f(1,0,0); glBegin(GL_LINES); glVertex2i(p1.x,p1.y); glVertex2i(p2.x,p2.y); glEnd(); } void plotlines(GLint button,GLint action,GLint xMouse,GLint yMouse) { static Point p1,p2; if(pnum==0) { if(button==GLUT_LEFT_BUTTON&&action==GLUT_DOWN) { p1.x=xMouse; p1.y=winHeight-yMouse; pnum=1; } } else { if(button==GLUT_LEFT_BUTTON&&action==GLUT_DOWN) { p2.x=xMouse; p2.y=winHeight-yMouse; pnum=0; drawline(p1,p2); } } glFlush(); } void MyReshape(int newWidth,int newHeight) { glViewport(0,0,newWidth,newHeight); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0,(GLdouble)newWidth,0,(GLdouble)newHeight); winWidth=newWidth; winHeight=newHeight; } void main(int argc,char** argv) { glutInit(&argc,argv); glutInitDisplayMode(GLUT_RGB|GLUT_SINGLE); glutInitWindowPosition(100,100); glutInitWindowSize(winWidth,winHeight); int win1=glutCreateWindow("window1"); //int win2=glutCreateWindow("window2"); Init(); glutReshapeFunc(MyReshape); glutDisplayFunc(MyDisplay); glutMouseFunc(plotlines); glutMainLoop(); }