C言语图形情势编程，赋性鼠标(4)

  *px=regs.x.cx;
         *py=regs.x.dx;
         *buttons=regs.x.bx;
    }while(*px==x_old&&*py==y_old&&*buttons==but_old);

    MsOff(x_old,y_old);
    but_old=*buttons;
    x_old=*px;
    y_old=*py;
    MsOn(x_old,y_old);
    return -1;
}

int Msinbox(int x1,int y1,int x2,int y2,int x,int y)
{
    return((x>=x1&&x<=x2&&y>=y1&&y<=y2)?1:0);  /* 若在预定区域就前往 1 */
}

int End()
{
    closegraph();
    exit(0);
}

不盛情思，没例子几乎难懂，以下是一个复杂的例子（把鼠标移到长条框就可以变化鼠标了）：

/*-----------------------------------------------------------*/
/*---                                                     ---*/
/*---          C 言语"箭头鼠标"与"手形鼠标"的切换         ---*/
/*---                                                     ---*/
/*---                                －－－   2007.03.18  ---*/
/*-----------------------------------------------------------*/
#include <stdio.h>
#include <graphics.h>
#include <dos.h>
/*=======================  必需的全局变量  ===================*/

union REGS regs;
int   up[16][16],down[16][16];
int   mouse_draw[16][16];
int   pixel_save[16][16];      /* 保管被鼠标笼盖的区域颜色*/
int   Mousekind=0 1*2 15*4 2*64;
      /* "形状(0和1)","标志核心或内部颜色(此中的 15 和 2)"*/
/*===========================================================*/
void MouseMath()    /* 计算鼠标的样子*/
{   /*Point hotspot[]={{0,11},{0,0},{4,0},{4,0}};热点*/
    int    i,j,jj,k;
    int    full,kind;
    long   UpNum[2][16] = { /* hand */
        0xf3ff,0xe1ff,0xe1ff,0xe1ff,
        0xe001,0xe000,0xe000,0xe000,
        0x8000,0x0000,0x0000,0x0000,
        0x0000,0x0000,0x8001,0xc003,

        0x3fff,0x1fff,0x0fff,0x07ff,/*  arrow箭头 */
        0x03ff,0x01ff,0x00ff,0x007f,
        0x003f,0x00ff,0x01ff,0x10ff,
        0x30ff,0xf87f,0xf87f,0xfc3f,
    };
    long   DownNum[2][16]={ /* hand */
        0x0c00,0x1200,0x1200,0x1200,
        0x13fe,0x1249,0x1249,0x1249,
        0x7249,0x9001,0x9001,0x9001,
        0x8001,0x8001,0x4002,0x3ffc,

        0x0000,0x4000,0x6000,0x7000,/*  arrow箭头 */
        0x7800,0x7c00,0x7e00,0x7f00,
        0x7f80,0x7e00,0x7c00,0x4600,
        0x0600,0x0300,0x0300,0x0180,
    };
    kind = (Mousekind>>1)%2;  /* 手形仍是箭头*/
    full = Mousekind%2;       /* 能否空心*/

    for(i=0;i<16;i )
    {
         j=jj=15;
         while(UpNum[kind][i]!=0)
         {
             up[i][j]=UpNum[kind][i]%2;
             j--;
             UpNum[kind][i]/=2;
         }
         while(DownNum[kind][i]!=0)
         {
             down[i][jj--]=DownNum[kind][i]%2;
             DownNum[kind][i]/=2;
         }
         for(k=j ;k>=0;k--)  up  [i][k]=0;
         for(k=jj;k>=0;k--)  down[i][k]=0;
         for(k=0;k<16;k )
         {   /*四种组合体式格式*/
             if(up[i][k]==0&&down[i][k]==0)
             {   /* 能否为空心*/
                 if(full)    mouse_draw[i][k]=1;
                 else        mouse_draw[i][k]=2;
             }
             else if(up[i][k]==0&&down[i][k]==1)
             {
                 if(full)    mouse_draw[i][k]=2;
                 else        mouse_draw[i][k]=1;
             }
             else if(up[i][k]==1&&down[i][k]==0) mouse_draw[i][k]=3;
             else                                mouse_draw[i][k]=4;
         }
    }
    if(kind==1) mouse_draw[1][2]=0;/*不凡点*/
    else        mouse_draw[1][2]=4;
}

void MouseOn(int x,int y)
{   /* 鼠标光标表现*/
    int  i,j;
    int  color[2];

    color[0]=Mousekind>>2;
    color[1]=Mousekind>>6;
    for(i=0;i<16;i )
    {
        for(j=0;j<16;j )
        {
            pixel_save[i][j]=getpixel(x j,y i);/* 保管原来的颜色*/
            if(mouse_draw[i][j]==1)
                putpixel(x j,y i,color[0]);
            else if(mouse_draw[i][j]==2)       /* 画鼠标*/
                putpixel(x j,y i,color[1]);
        }
    }
}

void MouseOff(int x,int y)
{   /* 隐蔽鼠标*/
    int  i,j,color;

    for(i=0;i<16;i )
    for(j=0;j<16;j )
    {
         if(mouse_draw[i][j]==3||mouse_draw[i][j]==4)  continue;
         color=getpixel(x j,y i);
         putpixel(x j,y i,color^color);     /* 原位置异或消去*/
         putpixel(x j,y i,pixel_save[i][j]);/* 复原原后台*/
    }
}

int MouseRead(int *px,int *py,int *buttons)




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