这篇文章主要为大家详细介绍了OpenGL绘制三次Bezier曲线,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
本文实例为大家分享了OpenGL绘制三次Bezier曲线的具体代码,供大家参考,具体内容如下
计算公式:
运行结果:
代码如下:
#include #include #include #include #include using namespace std; struct Point { int x, y; Point(){}; Point(int tx, int ty) { x = tx; y = ty; } }; vector p; double getRatio(double t,double a,double b,double c,double d) { return a * pow(t, 3) + b * pow(t, 2) + c * t + d; } void Bezier() { int n = 500; double derta = 1.0 / n; glPointSize(2); glColor3d(0, 0, 0); glBegin(GL_POINTS); for (int i = 1; i <n; i++) { double t = derta * i; double ratio[4]; rati<b style="color:transparent">来源gao@!dai!ma.com搞$$代^@码!网</b>o[0] = getRatio(t, -1, 3, -3, 1); ratio[1] = getRatio(t, 3, -6, 3, 0); ratio[2] = getRatio(t, -3, 3, 0, 0); ratio[3] = getRatio(t, 1, 0, 0, 0); double x=0, y=0; for (int j = 0; j <4; j++) { x += ratio[j] * p[j].x; y += ratio[j] * p[j].y; } glVertex2d(x, y); } glEnd(); } void myDisplay() { glClear(GL_COLOR_BUFFER_BIT); //清除颜色缓存和深度缓存 //画点 glPointSize(5); glColor3d(1, 0, 0); glBegin(GL_POINTS); for (int i = 0; i <p.size(); i++) glVertex2d(p[i].x, p[i].y); glEnd(); //画线 glLineWidth(2); glColor3d(0, 1, 0); glBegin(GL_LINE_STRIP); for (int i = 0; i <p.size(); i++) glVertex2d(p[i].x, p[i].y); glEnd(); if (p.size() == 4) Bezier(); glFlush(); } void mouse(int button, int state, int x, int y) { if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN && p.size() > 1, (GetSystemMetrics(SM_CYSCREEN) - height) >> 1); //指定窗口位置 glutInitWindowSize(width, height); //指定窗口大小 glutCreateWindow(title); glClearColor(1, 1, 1, 0); glShadeModel(GL_FLAT); } int main(int argc, char *argv[]) { initWindow(argc, argv, 600, 600, "四点画Bezier曲线"); puts("\n\t鼠标在窗口点击四次后自动绘制出Bezier曲线"); glutDisplayFunc(myDisplay); glutReshapeFunc(Reshape); glutMouseFunc(mouse); glutMainLoop(); return 0; }
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