#include"stdio.h"
#include"dos.h"
#include"graphics.h"

typedef struct PaletteColor
{
	unsigned char red;
	unsigned char green;
	unsigned char blue;
}PalColor,*PalColor_p;

PalColor_p GetPalColor(int index)   /*獲取序號為index的調(diào)色板寄存器的顏色信息*/
{
	PalColor_p color;
	outp(0x3c6,0xff);
	outp(0x3c7,index);
	color->red=inp(0x3c9);
	color->green=inp(0x3c9);
	color->blue=inp(0x3c9);
	return color;
}

void SetPalColor(int index, PalColor_p color) /*設(shè)置序號為index的調(diào)色板寄存器顏色*/
{
	outp(0x3c6,0xff);
	outp(0x3c8,index);
	outp(0x3c9,color->red);
	outp(0x3c9,color->green);
	outp(0x3c9,color->blue);
}

main()
{
	int i,j,index;
	int gd=DETECT,gm;
	PalColor *old_color,color;   /*其中old_color用于保存原寄存器顏色信息*/
	initgraph(&gd,&gm,"c:\\tc");
	index=1;                 /*設(shè)置將要使用的調(diào)色板寄存器序號為1號*/
	setcolor(15);
	circle(300,200,50);
	setfillstyle(1,index);
	/*使用1號調(diào)色板寄存器內(nèi)存放的顏色（初始為藍(lán)色）來填充圓*/
	floodfill(300,200,15);
	old_color=GetPalColor(index); /*保存1號寄存器的藍(lán)顏色信息*/
	color.red=color.green=color.blue=0; /*將三原色都初始化為0*/
	getch();
	for(i=0;i<63;i++)
	{
		/*使三原色的值依次加1*/
		color.red+=1;   
		color.green+=1;
		color.blue+=1;
		SetPalColor(1,&color); /*設(shè)置由color指定的新的顏色到1號寄存器內(nèi)*/
		for(j=0;j<10;j++)     /*延時*/
			delay(5000);
	}
	SetPalColor(1,old_color);
	/*當(dāng)圓內(nèi)的顏色達(dá)到最亮?xí)r重新設(shè)回由old_color保存的藍(lán)色*/
	getch();
}