opengl中bezier曲线在xp系统上的问题

来源：互联网发布：linux mv 排除目录编辑：程序博客网时间：2024/05/21 22:46

今天，用opengl实现bezier曲线的绘制，但是当我将控制点增加到九个的时候，程序死活绘制不出图像。

后来经过一番折腾，终于知道，是xp系统的问题，程序在win7上可以正常运行。

下面我附上我的主要程序

第一段是利用

glEvalCoord1f()

函数先生成离散点，然后用直线链接。

glShadeModel(GL_FLAT);  glColor3f(1.0,0.0,0.0);GLfloat controlPoint[9][3] = {{-1.0f,0.0f,0.0f},{-0.75f,0.707f,0.0f},{-0.5f,1.0f,0.0f},{-0.25f,0.707f,0.0f},{0.0f,0.0f,0.0f},{0.25f,-0.707f,0.0f},{0.5f,-1.0f,0.0f},{0.75f,-0.707f,0.0f},{1.0f,0.0f,0.0f}};glMap1f(GL_MAP1_VERTEX_3,0.0,1.0,3,8,(const float*)controlPoint);glEnable(GL_MAP1_VERTEX_3);glBegin(GL_LINE_STRIP);for(int i = 0;i <= 100; i++)glEvalCoord1f((GLfloat)i/(GLfloat)100.0);glEnd();glDisable(GL_MAP1_VERTEX_3);

第二段是利用glMapGrid1d();对u参数进行自动等分。再用glEvalMesh1（）函数产生一系列的点并利用这些顶点坐标最终绘制一条曲线。

glShadeModel(GL_FLAT);  glColor3f(1.0,0.0,0.0);GLfloat controlPoint[9][3] = {{-1.0f,0.0f,0.0f},{-0.75f,0.707f,0.0f},{-0.5f,1.0f,0.0f},{-0.25f,0.707f,0.0f},{0.0f,0.0f,0.0f},{0.25f,-0.707f,0.0f},{0.5f,-1.0f,0.0f},{0.75f,-0.707f,0.0f},{1.0f,0.0f,0.0f}};glMap1f(GL_MAP1_VERTEX_3,0.0,1.0,3,8,(const float*)controlPoint);glEnable(GL_MAP1_VERTEX_3);glMapGrid1f(50,0.0f,1.0f);glEvalMesh1(GL_LINE,0,50);glDisable(GL_MAP1_VERTEX_3);