DDA.rar_DDA_discussionvml

#include <windows.h> #include <GL/glu.h> #include <GL/gl.h> #include <GL/glut.h> #include<stdlib.h> #include<iostream> using namespace std; void DDA(int x0, int y0, int x1, int y1) { int dx = x1 - x0,dy = y1 - y0,s; float xi, yi, x = x0, y = y0; if (abs(dx )>abs( dy) ) { s = abs(dx); } else { s = abs(dy); } xi = float(dx) / float(s); yi = float(dy) / float(s); glPointSize(1); glBegin(GL_POINTS); glVertex3f(x0, y0, 0); for(int j = 0; j <= s; ++j) { x += xi; y += yi; glVertex2f(int(x+0.5), int(y+0.5)); } glVertex2f(int(x1+0.5), int(y1+0.5)); glEnd(); glFlush(); } void display(void) { glViewport(0, 0, 500, 500); int j1,j2,j3,j4; DWORD k=::GetTickCount(); for(int i=0;i<100000;i++) { j1= rand()%400; j2=rand()%400; j3=rand()%400; j4=rand()%400; DDA(j1, j2, j3, j4); } cout<<"耗时:"<<::GetTickCount()-k<<"毫秒"<<endl; } int main(int argc, char* argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); glutInitWindowSize(400, 400); glutInitWindowPosition(200, 200); glutCreateWindow("DDA"); glutDisplayFunc(display); //myInit(); glClearColor(1.0, 1.0, 1.0, 0.0); glColor3f(1.0, 0.0, 0.0); gluOrtho2D(0.0, 500.0, 0.0, 500.0); glMatrixMode(GL_MODELVIEW); glutMainLoop(); return(0); }