OpenGL实现四次次Bezier曲线

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

#include <GL/glut.h> #include <cmath><br> 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); }<br> void  myDisplay() {     float x0 = 50, y0 = 50;     float x1 = 100, y1 = 400;     float x2 = 300, y2 = 400;     float x3 = 400, y3 = 50;     float x4 = 450, y4 = 450;       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);     glVertex2f(x4, y4);     glEnd();       //四次次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), 4) + 4 * x1*pow((1 - t), 3)*t + 6 * x2*(1 - t)*(1 - t)*t*t + 4 * x3*(1 - t)*pow(t, 3) + x4*pow(t, 4);         y = y0 * pow((1 - t), 4) + 4 * y1*pow((1 - t), 3)*t + 6 * y2*(1 - t)*(1 - t)*t*t + 4 * y3*(1 - t)*pow(t, 3) + y4*pow(t, 4);         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("四次Bezier曲线");     init();     glutDisplayFunc(myDisplay);     glutMainLoop();     return 0; }