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Archive for December 1, 2009

C++ Graphics – 01 – Line program by Using Mid-Point Algorithm

December 1, 2009 Leave a comment

Create a Line program by Using Mid-Point Algorithm.

#include <stdio.h>
#include <conio.h>
#include <graphics.h>
#include <math.h>
#include <dos.h>

void lineMidPoint(int x1, int y1, int x2, int y2){
	int dx = x2 - x1;
	int dy = y2 - y1;
	int d = 2 * dy - dx;
	int incrE = 2 * dy;
	int incrNE = 2 * (dy - dx);
	int x = x1;
	int y = y1;
	putpixel(x, y, WHITE);
	while(x < x2){
		if(d<=0){
			d += incrE;
			x++;
			}
		else{
			d += incrNE;
			x++;
			y++;
			}
		putpixel(x, y, WHITE);
		}
	}

int main(){
	int gd=DETECT, gm;
	initgraph(&gd, &gm, "\\tc");
	lineMidPoint(100, 100, 600, 300);
	getch();
	return 0;
	}
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