opengl中点画线算法（opengl绘制点线面）

本文实例为大家分享了OpenGL实现中点划线法的具体代码，供大家参考，具体内容如下

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 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 #include "GL/glut.h" #include "stdio.h" #include "math.h" int xs, ys, xe, ye; void MidpointLine(int x0, int y0, int x1, int y1) { if((x0 != x1) && (y0 != y1)) { int a, b, deltal, delta2, d, x, y; a = y0 - y1; b = x1 - x0; d = 2 * a + b; deltal = 2 * a; delta2 = 2 * (a + b); x = x0; y = y0; glVertex2i(x, y); while(x < x1) { if(d < 0) { x++; y++; d += delta2; } else { x++; d += deltal; } glVertex2i(x, y); } } else { int min, d; if(x0 == x1) { int x = x0, y; y = (y0<=y1) ? y0 : y1; d = fabs((double)(y0 - y1)); while (d <= 0) { glVertex2i(x, y); y++; d--; } } } } void lineSegment() { glClear(GL_COLOR_BUFFER_BIT); glColor3f(0.0, 0.0, 0.0); glBegin(GL_POINTS); MidpointLine(xs, ys, xe, ye); glEnd(); glFlush(); } void main(int argc, char * argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); printf("输入线段起始和终止点坐标（范围为0-500,0-500）"); scanf("%d, %d, %d, %d", &xs, &ys, &xe, &ye); glutInitWindowPosition(50, 100); glutInitWindowSize(500, 500); glutCreateWindow("中点划线法"); glClearColor(1.0, 1.0, 1.0, 0.0); glMatrixMode(GL_PROJECTION); gluOrtho2D(0.0, 500.0, 0.0, 500.0); glutDisplayFunc(lineSegment); glutMainLoop(); }