graphics.c

参照MINIX3写的操作系统 用GCC+NASM+BOCHS开发

//#include "graphics/graphics.h"
#define PUBLIC 
#define PRIVATE static 
double fabs(double x)
{
	return  x < 0 ? -x : x;
}

/*
	SetPixel:画点函数
*/
//PUBLIC void SetPixel(int x,int y,int color)
//{
//}
/*
	GetPixel:取得像素点的颜色值
*/
PUBLIC int GetPixel(int x,int y)
{
}

/*
	Clear:清屏函数
*/
PUBLIC void Clear()
{

}
/*
	Line:画线函数
*/
PUBLIC void Line(int x1,int y1,int x2,int y2,int color)
{
	int i;
	float dx,dy,length,x,y;
	if(fabs(x2-x1)>=fabs(y2-y1))
		length=(float)fabs(x2-x1);
	else
		length=(float)fabs(y2-y1);
	dx=(x2-x1)/length;
	dy=(y2-y1)/length;
	i=1;
	x=(float)x1;
	y=(float)y1;
	while(i<=length)
	{
		SetPixel((int)(x+0.5),(int)(y+0.5),color);
		x=x+dx;
		y=y+dy;
		i++;
	
	}
}
/*
	MoveTo:置开始画线位置
*/
PUBLIC void MoveTo(int x,int y)
{
}
/*
	LineTo:在画线开始点和给定点之间画直线
*/
PUBLIC void LineTo(int x,int y)
{
}
/*
	Rectangle:画正方形

*/
PUBLIC void Rectangle(int x1,int y1,int x2,int y2,int color )
{
}

/*
	Poly:画多边形
*/
PUBLIC void Poly(int *border,int color)
{
}

/*
	Circle:画圆
*/
/********************************Circle**************************************************/
PRIVATE void CirclePoints(int x,int y,int color)
{
	SetPixel(x,y,color);SetPixel(y,x,color);
	SetPixel(-x,y,color);SetPixel(y,-x,color);
	SetPixel(x,-y,color);SetPixel(-y,x,color);
	SetPixel(-x,-y,color);SetPixel(-y,-x,color);

}
PUBLIC void Circle(int x0,int y0,int r,int color)
{
	int x,y;
	int e;
	x=0;y=r;e=1-r;
	CirclePoints(x,y,color);
	while(x<=y)
	{
		if(e<0)
			e+=2*x+3;
		else
		{
			e+=2*(x-y)+5;
			y--;
		}
		x++;
	CirclePoints(x,y,color);
	}
}
/********************************Circle**************************************************/
/*
	Sector:画扇形
*/

PUBLIC void Sector(int x0,int y0,int r,int startAngle,int endAngle,int color)
{
}
/*
	Ellipse:画椭圆
*/
PUBLIC void Ellipse(int x0,int y0,long r1,long r2,int color)
{
}

/*
	Rectangle:画实正方形

*/
PUBLIC void FillRectangle(int x1,int y1,int x2,int y2,int color )
{
}

/*
	Poly:画实多边形
*/
PUBLIC void FillPoly(int *border,int color)
{
}
/*
	Circle:画实圆
*/
PUBLIC void FillCircle(int x0,int y0,int r,int color)
{
}
/*
	Sector:画实扇形
*/

PUBLIC void FillSector(int x0,int y0,int r,int startAngle,int endAngle,int color)
{
}
/*
	Ellipse:画实椭圆
*/
PUBLIC void FillEllipse(int x0,int y0,long r1,long r2,int color)
{
}

/*
	PutImage:
*/
PUBLIC void PutImage(unsigned char *image,int x1,int y1,int x2,int y2)
{
}
/*
	GetImage:
*/
PUBLIC void GetImage(unsigned char *image,int x1,int y1,int x2,int y2)
{
}