OpenGL制作会旋转的矩形

来源：互联网发布：圆形头像制作软件编辑：程序博客网时间：2024/06/05 22:39

#include<Windows.h>

#include<GL\glut.h>

static GLfloat spin = 0.0;/*旋转度数*/
BOOL state = false;/*鼠标按键标志*/
static GLfloatroate = 2.99; /*旋转度数增量*/

void init()
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glShadeModel(GL_FLAT);
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();/*矩阵压栈*/
glRotatef(spin, 0.0, 0.0, -1.0);/*绕着z轴旋转每次旋转spin度正：逆时针*/
glColor3f(1.0, 1.0, 1.0);
glRectf(-250.0, -250.0, 250.0, 250.0);/*画矩形参数：对角线*/
glPopMatrix();/*矩阵出栈*/
glutSwapBuffers();/*双缓冲*/
}

void spinDisplay()
{
spin = spin + roate;
if (spin > 360.0)
{
spin = spin - 360.0;
}
glutPostRedisplay();/*每一次移动都显示到窗口中，如果没有就看不到动画，即每一次移动都调用一次display函数*/
}

void reshape(int w, int h)
{
glViewport(0, 0, (GLsizei)w, (GLsizei)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-350.0, 350.0, -350.0, 350.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}

void mouse(int button, int state, int x, int y)
{
switch(button)
{
case GLUT_LEFT_BUTTON:/*鼠标左键开始旋转*/
if (state == GLUT_UP);
glutIdleFunc(spinDisplay);
break;
case GLUT_RIGHT_BUTTON:/*鼠标右键停止旋转*/
if (state == GLUT_DOWN)
glutIdleFunc(NULL);
default:break;
}
}

void keybord(unsigned char key, int x, int y)
{
switch (key)
{
case 'f': /*按f开始旋转*/
glutIdleFunc(spinDisplay);/*在没有新的指令到达之前glutIdleFunction一直调用spinDisplay*/
break;
case 'd': /*按d停止旋转*/
glutIdleFunc(NULL);/*NULL禁用其函数回调*/
break;
case '-': /*减小旋转速度*/
roate--;
break;
case '+': /*增加旋转速度*/
roate++;
break;
default:
break;
}
}

int main(int argc, char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutInitWindowSize(600, 600);
glutInitWindowPosition(100, 100);
glutCreateWindow(argv[0]);
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(keybord);
glutMouseFunc(mouse);
glutMainLoop();
return 0;

}

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