#include <stdlib.h>
#include <time.h>
#include <GL/glut.h>
/* 控制点的坐标 */
GLfloat ctrlpoints[4][4][3] = {{ { -1.5, -1.5, 2.0 },{ -0.5, -1.5, 2.0 },{ 0.5, -1.5, -1.0 },{ 1.5, -1.5, 2.0 }},{ { -1.5, -0.5, 1.0 },{ -0.5, 1.5, 2.0 },{ 0.5, 0.5, 1.0 },{ 1.5, -0.5, -1.0 } },{ { -1.5, 0.5, 2.0 },{ -0.5, 0.5, 1.0 },{ 0.5, 0.5, 3.0 },{ 1.5, -1.5, 1.5 } },{ { -1.5, 1.5, -2.0 },{ -0.5, 1.5, -2.0 },{ 0.5, 0.5, 1.0 },{ 1.5, 1.5, -1.0 } } };void init(void)
{//背景色glClearColor(0.0, 0.0, 0.0, 1.0);glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, &ctrlpoints[0][0][0]);//允许二维映射glEnable(GL_MAP2_VERTEX_3);//二维映射：x、y方向U和V的参数[0, 1]，且中间插值数量为各20个glMapGrid2f(20, 0.0, 1.0, 20, 0.0, 1.0);//允许深度测试glEnable(GL_DEPTH_TEST);glEnable(GL_BLEND);glEnable(GL_LINE_SMOOTH);glHint(GL_LINE_SMOOTH_HINT, GL_FASTEST); // Antialias the linesglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
void display(void)
{glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);glColor3f(0.0, 1.0, 0.0);glPushMatrix();glRotatef(0.1, 1.0, 1.0, 1.0);int i, j;for (j = 0; j <= 8; j++) {glBegin(GL_LINE_STRIP);for (i = 0; i <= 30; i++)glEvalCoord2f((GLfloat)i / 30.0, (GLfloat)j / 8.0); //固定y坐标时x方向的网格坐标glEnd();glBegin(GL_LINE_STRIP);for (i = 0; i <= 30; i++)glEvalCoord2f((GLfloat)j / 8.0, (GLfloat)i / 30.0); //固定x坐标时y方向的网格坐标 glEnd();}glPopMatrix();glutSwapBuffers();
}
void reshape(GLsizei w, GLsizei h)
{glViewport(0, 0, w, h);glMatrixMode(GL_PROJECTION);glLoadIdentity();if (w <= h)glOrtho(-5.0, 5.0, -5.0*(GLfloat)h / (GLfloat)w, 5.0*(GLfloat)h / (GLfloat)w, -5.0, 5.0);elseglOrtho(-5.0*(GLfloat)w / (GLfloat)h, 5.0*(GLfloat)w / (GLfloat)h, -5.0, 5.0, -5.0, 5.0);glMatrixMode(GL_MODELVIEW);glLoadIdentity();
}
int main(int argc, char** argv)
{srand((unsigned int)time(0));glutInit(&argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);//使用双缓存模式和深度缓存glutInitWindowSize(800, 800);glutInitWindowPosition(0, 0);glutCreateWindow("Bezier曲面线框模型");init();glutDisplayFunc(display);glutReshapeFunc(reshape);glutMainLoop();return 0;
}实现效果:
