在固定区域弹跳的小球代码

#include <glut.h> #include <stdlib.h> #include<stdio.h> #include<math.h> #define p 3.1415926 float x,y,dx,dy; float s,c; void init(void) { glClearColor (0.0, 1.0, 1.0, 0.0); glShadeModel (GL_FLAT); } ///该函数用于设置渲染状态 void SetupRC(void) { glClearColor(1.0f, 0.0f, 1.0f,1.0f); //设置背景的颜色 } void display(void){ s=p*c/180; if(c<=45){ dx=0.002; dy=0.002*tan(s); while(x<3&&x>-3&&y<3&&y>-3){ glClear (GL_COLOR_BUFFER_BIT); glColor3f (1.0, 0.0, 1.0); glPushMatrix(); if((x-0.2)<(-2.86)) {dx=0.002;} if((y-0.2)<(-2.86)) {dy=0.002*tan(s);} if((x+0.2)>2.86){ dx=-0.002;} if((y+0.2)>2.86) {dy=-0.002*tan(s);} x=x+dx; y=y+dy; glTranslatef (x, y, 0.0); glRotatef ((GLfloat) 0.0, 0.0, 0.0, 0.0); glutWireSphere(0.2, 100, 100); /* draw smaller planet */ glPopMatrix(); glutSwapBuffers(); } } else{ dy=0.002; dx=0.002/tan(s); while(y<3&&y>-3&&x<3&&x>-3){ glClear (GL_COLOR_BUFFER_BIT); glColor3f (1.0, 0.0, 1.0); glPushMatrix(); if((y+0.2)>2.86){ dy=-0.002;} if((x+0.2)>2.86) {dx=-0.002/tan(s);} if((y-0.2)<-2.86) {dy=0.002;} if((x-0.2)<-2.86) {dx=0.002/tan(s);} x=x+dx; y=y+dy; glTranslatef (x, y, 0.0); glRotatef ((GLfloat) 0.0, 0.0, 0.0, 0.0); glutWireSphere(0.2, 100, 100); /* draw smaller planet */ glPopMatrix(); glutSwapBuffers(); } } } void reshape (int w, int h) { glViewport (0, 0, (GLsizei) w, (GLsizei) h); glMatrixMode (GL_PROJECTION); glLoadIdentity (); gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); } int main(int argc, char** argv){ printf("请输入小球弹射的角度(0~90):"); scanf("%f",&c); glutInit(&argc, argv); glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize (500, 500); glutInitWindowPosition (100, 100); glutCreateWindow (argv[0]); init (); glutDisplayFunc(display); glutReshapeFunc(reshape); glutMainLoop(); return 0; }