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#include <graphics.h> #include <dos.h> #include <stdio.h> #define ENABLE 0x0F #define INDEXREG 0x3CE /*定义索引寄存器端口地址*/ #define VALREG 0x3CF /*定义数据寄存器端口地址*/ #define VGABASE 0xA0000000L #define WIDTH 80L #define XMAX 639 #define YMAX 479 #define XMIX 0 #define YMIN 0 #define OUTINDEX(index,val) outport(INDEXREG,index);outport(VALREG,val); char far *vgabase; void putpoint(int x,int y,int color,int how); main() { int gmode=VGAHI,gdriver=VGA; int color=1,x,y; initgraph(&gdriver,&gmode,""); /*绘制各种颜色的直线段*/ for(y=1;y<=479;++y){ for(x=1;x<=639;++x) putpoint(x,y,color,0); color++;} getch(); /*用异或方式擦除各条直线*/ color=1; for(y=1;y<=479;++y){ for(x=1;x<=639;++x) putpoint(x,y,color,0x18); color++;} getch(); closegraph(); } /*利用图形控制寄存器功能写像素函数*/ void putpoint(int x,int y,int color,int how) { register unsigned char mask=0x80; register char far *base; unsigned dummy; vgabase=(char far *)MK_FP(0xA000,0); base=(char far *)(vgabase+((long)y* WIDTH+(long)x/8L)); mask>>=x%8; dummy=*base; OUTINDEX(0,color);/*设定额色*/ OUTINDEX(1,ENABLE);/*启动位平面*/ OUTINDEX(3,how); /*确定逻辑操作方式*/ OUTINDEX(8,mask);/*设置屏蔽位*/ *base=1; OUTINDEX(0,0);/*寄存器复位*/ OUTINDEX(1,0); OUTINDEX(3,0); OUTINDEX(8,0xff); }