DDA画线算法

#include<stdio.h>

#include"graphics.h"

#include<math.h>

#include<stdlib.h>

void DDALine(int x0, int y0, int x1, int y1);

int main()

{

int gdriver = DETECT, gmode;

int x0, y0, x1, y1;

printf("please input the start point:\n");

scanf_s("%d%d", &x0, &y0);

printf("please input the end point:\n");

scanf_s("%d%d", &x1, &y1);

initgraph(&gdriver, &gmode, "");    //初始化图形界面

DDALine(x0, y0, x1, y1);

system("pause");    //暂停函数

closegraph();   //关闭图形界面

}

void DDALine(int x0, int y0, int x1, int y1)

{

int dx=x1-x0, dy=y1-y0,k;

double x = x0, y = y0, xIncre, yIncre, espl;

espl = abs(dy);

if (abs(dx) > abs(dy))

espl = abs(dx);

xIncre = 1.0*dx / espl;

yIncre = 1.0*dy / espl;

for (k = 0; k < espl;k++)

{

putpixel((int)x, (int)y, RED);

x += xIncre;

y += yIncre;

}

}