//?直線段掃描轉換.cpp:?定義控制臺應用程序的入口點。
//

#include?“stdafx.h“
#include?
#include?
#include?
#include?
#include?
using?namespace?std;
#define?DDALINE?0
#define?MIDPOINTLINE?1
#define?BRESENHAMLINE?2

int?line?=?DDALINE;
float?down_x?=?0?down_y?=?0?up_x?=?0?up_y?=?0;
float?delta?=?1;

void?IntergerBresenham（float?x1?float?y1?float?x2?float?y2?GLfloat*color?GLfloat?size?=?1）
{
	glPointSize（size）;
	float?x?=?x1?y?=?y1;
	float?end_x?=?x2?end_y?=?y2;
	float?delta_x?=?x2?-?x1;
	float?delta_y?=?y2?-?y1;
	float?k?=?delta_y?/?delta_x;
	float?d?d1?d2;
	if?（k?=?0）?{
		if?（x2?-?x1?			x?=?x2;
			y?=?y2;
			end_x?=?x1;
			end_y?=?y1;
			delta_x?=?end_x?-?x;
			delta_y?=?end_y?-?y;
		}
		d?=?2?*?delta_y?-?delta_x;
		d1?=?2?*?delta_y;
		d2?=?2?*?delta_x;
		glBegin（GL_POINTS）;
		{
			glColor3f（color[0]?color[1]?color[2]）;
			while?（x?				glVertex2f（x?y）;
				x?+=?delta;
				d?+=?d1;
				if?（d?>=?0）?{
					y?+=?delta;
					d?-=?d2;
				}
			}
		}
		glEnd（）;
		glFlush（）;
	}
	else?if?（k?>?1）?{
		if?（y2?-?y1?			x?=?x2;
			y?=?y2;
			end_x?=?x1;
			end_y?=?y1;
			delta_x?=?end_x?-?x;
			delta_y?=?end_y?-?y;
		}
		k?=?1?/?k;
		d?=?2?*?delta_x?-?delta_y;
		d1?=?2?*?delta_x;
		d2?=?2?*?delta_y;
		glBegin（GL_POINTS）;
		{
			glColor3f（color[0]?color[1]?color[2]）;
			while?（y?				glVertex2f（x?y）;
				y?+=?delta;
				d?+=?d1;
				if?（d?>=?0）?{
					x?+=?delta;
					d?-=?d2;
				}
			}
		}
		glEnd（）;
		glFlush（）;
	}
	else?if?（k??-1）?{
		if?（x2?-?x1?			x?=?x2;
			y?=?y2;
			end_x?=?x1;
			end_y?=?y1;
			delta_x?=?end_x?-?x;
			delta_y?=?end_y?-?y;
		}
		d?=?2?*?delta_y?-?delta_x;
		d1?=?2?*?delta_y;
		d2?=?2?*?delta_x;
		glBegin（GL_POINTS）;
		{
			glColor3f（color[0]?color[1]?color[2]）;
			while?（x?				glVertex2f（x?y）;
				x?+=?delta;
				d?+=?d1;
				if?（d?					y?-=?delta;
					d?+=?d2;
				}
			}
		}
		glEnd（）;
		glFlush（）;
	}
	else?{
		if?（y2?-?y1?			x?=?x2;
			y?=?y2;
			end_x?=?x1;
			end_y?=?y1;
			delta_x?=?end_x?-?x;
			delta_y?=?end_y?-?y;
		}
		k?=?1?/?k;
		d?=?2?*?delta_x?-?delta_y;
		d1?=?2?*?delta_x;
		d2?=?2?*?delta_y;
		glBegin（GL_POINTS）;
		{
			glColor3f（color[0]?color[1]?color[2]）;
			while?（y?				glVertex2f（x?y）;
				y?+=?delta;
				d?+=?d1;
				if?（d?					x?-=?delta;
					d?+=?d2;
				}
			}
		}
		glEnd（）;
		glFlush（）;
	}
}

void?Bresenham（float?x1?float?y1?float?x2?float?y2?GLfloat*color?GLfloat?size?=?1）
{
	glPointSize（size）;
	float?x?=?x1?y?=?y1;
	float?end_x?=?x2?end_y?=?y2;
	float?d?=?0;
	float?delta_x?=?x2?-?x1?delta_y?=?y2?-?y1;
	float?k?=?delta_y?/?delta_x;
	if?（k?=?0）?{
		if?（x2?-?x1?			x?=?x2;
			y?=?y2;
			end_x?=?x1;
			end_y?=?y1;
		}
		d?=?k;
		glBegin（GL_POINTS）;
		{
			glColor3f（color[0]?colo