計算機圖形學上機實驗終於能摸索畫出來了,可喜可賀可喜可賀
DDA算法直接是參照教材上的,就是畫點的那部分自己改了下,當然這就已經夠累了,畢竟老師的意念教學默認你已經精通opengl,然後能立馬畫個鑽石圖案什麼的。。。
聲明:以下知識全部來源於互聯網,本人並不懂其中原理
#include <GL/gl.h>
#include <GL/glut.h>
#include <iostream>
#include <cmath>
using namespace std;
void init()
{
glClearColor (0.0, 0.0, 0.0, 0.0);
glMatrixMode (GL_PROJECTION);
gluOrtho2D (0.0, 200.0, 0.0, 150.0);
}
void DDALine()
{
glClear(GL_COLOR_BUFFER_BIT);
int x0,y0,x1,y1; //直線端點座標,下面四行可以隨便改
x0=0;
y0=0;
x1=58;
y1=56;
int dx,dy,epsl,k;
double x,y,xIncre,yIncre;
dx=x1-x0;
dy=y1-y0;
x=x0;
y=y0;
if(abs(dx)>abs(dy))
epsl=abs(dx);
else
epsl=abs(dy);
xIncre=(double)dx/(double)epsl;
yIncre=(double)dy/(double)epsl;
for(k=0; k<=epsl; ++k)
{
glPointSize(2);
glBegin(GL_POINTS);
glVertex2i(int(x+0.5),int(y+0.5));
glEnd();
glFlush();
x+=xIncre;
y+=yIncre;
}
}
int main(int argc, char *argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);
glutInitWindowPosition(100, 100);
glutInitWindowSize(500, 500);
glutCreateWindow("第一個opengl程序");
init();
glutDisplayFunc(DDALine);
glutMainLoop();
return 0;
}