OpenGL实现三次Bezier曲线

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#include <GL/glut.h> #include <cmath> void init(void) {     glClearColor(0.0, 0.0, 0.0, 0.0);     glMatrixMode(GL_PROJECTION);     gluOrtho2D(0.0, 500.0, 0.0, 500.0);     glMatrixMode(GL_MODELVIEW); } void  myDisplay() {     float x0 = 50, y0 = 50;     float x1 = 100, y1 = 400;     float x2 = 300, y2 = 400;     float x3 = 400, y3 = 50;           glPointSize(3);     glColor3f(1.0, 0.0, 0.0);       //控制点     glBegin(GL_POINTS);     glVertex2f(x0, y0);     glVertex2f(x1, y1);     glVertex2f(x2, y2);     glVertex2f(x3, y3);     glEnd();       //三次Bezier曲线     float x, y;     glColor3f(0.0, 1.0, 0.0);     glBegin(GL_LINE_STRIP);     for (float t = 0; t <= 1; t+=0.01)     {         x = x0 * pow((1 - t), 3) + 3 * x1*t*(1 - t)*(1 - t) + 3 * x2*t*t*(1 - t) + x3 * pow(t, 3); //x分量         y = y0 * pow((1 - t), 3) + 3 * y1*t*(1 - t)*(1 - t) + 3 * y2*t*t*(1 - t) + y3 * pow(t, 3); //y分量         glVertex2f(x, y);     }     glEnd();     glFlush(); }     int main(int argc, char* argv[]) {     glutInit(&argc, argv);     glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);     glutInitWindowPosition(100, 100);     glutInitWindowSize(500, 500);     glutCreateWindow("三次Bezier曲线");     init();     glutDisplayFunc(myDisplay);     glutMainLoop();     return 0; }