筆者用C語言開發了一個手工繪制電力系統一次接線圖的鍵盤繪圖程序,使用該程序繪制的一次接線圖符合用戶需求,效果良好.
一、使用方法
程序中定義了幾個特殊鍵:
\"V":畫筆提起
\"W":開始畫圖
\"R":開始擦圖
\"S":當前圖形存入文件
\"E":調出已有文件
\"C":畫圓
程序一運行,屏幕上出現一個黃色的邊框來設定畫圖的區域,區域中間出現提起的畫筆符號 ,當按下"W"鍵時,畫筆符號變為 ,此時可移動方向鍵(上、下、左、右、左上、左下、右上、右下)來畫圖;當按下"R"鍵時,畫筆符號變為 ,此時可移動方向鍵來擦圖;在畫圖過程中,按下"C"鍵,可畫出一個半徑為20個象素點的圓;當結束畫圖時,按下"S"鍵,將畫好的圖形存盤;按下"E"鍵可調出已有的圖形進行編輯.
二、源程序清單
# include \"graphics.h\"
# include \"stdio.h\"
# include \"fcntl.h\"
# include \"stdlib.h\"
main()
void save(),load();
void *wg,*rg,*vg,*fy;
int driver,mode;
int c=RED;
int x=320,y=225;
int x1,y1,x2,y2;
int k,k1,k2;
/* initialize grapher */
detectgraph(&driver,&mode);
initgraph(&driver,&mode,\"c:\\tc\");
/* write the pen */
bar(200,10,206,16);
line(203,7,200,10);
line(203,7,206,10);
line(243,7,240,16);
line(243,7,246,16);
line(283,7,280,10);
line(283,7,286,10);
line(283,7,283,16);
/* save the pen */
wg=malloc(imagesize(200,7,206,16));
rg=malloc(imagesize(240,7,246,16));
vg=malloc(imagesize(280,7,286,16));
fy=malloc(imagesize(200,7,206,16));
getimage(200,7,206,16,wg);
getimage(240,7,246,16,rg);
getimage(280,7,286,16,vg);
cleardevice();
/* write the box */
setcolor(YELLOW);
rectangle(4,19,637,447);
x1=x-3;
y1=y+1;
x2=x+3;
y2=y+10;
getimage(x1,y1,x2,y2,fy);
putimage(x1,y1,vg,XOR_PUT);
/* receive the command */
for (;;)
while (bioskey(1)==0);
k=bioskey(0);
putimage(x1,y1,fy,AND_PUT);
if (((k&0x00ff)|0x00)==0)
k1=k&0xff?0:k>>8; /* k1 is the specialkey value */
else
k2=k&0x00ff; /* k2 is the non-specialkey value */
if (((k&0x00ff)|0x00)==0) /* Special key */
switch(k1)
case 45:
restorecrtmode();
exit(0);
case 72:
if (y>20)
y=y-1;
break;
case 75:
if (x>5)
x=x-1;
break;
case 77:
if (x<636)
x=x+1;
break;
case 80:
if (y<446)
y=y+1;
break;
case 71:
if ((x>5)&&(y>20))
x=x-1;
y=y-1;
break;
case 79:
if ((x>5)&&(y<446))
x=x-1;
y=y+1;
break;
case 73:
if ((x<636)&&(y>20))
x=x+1;
y=y-1;
break;
case 81:
if ((x<636)&&(y<446))
x=x+1;
y=y+1;
break;
x1=x-3;
y1=y+1;
x2=x+3;
y2=y+10;
getimage(x1,y1,x2,y2,fy);
/* non-special key */[Page]
switch(k2)
case 118: /* \'v\' */
case 86: /* \'V\' */
putimage(x1,y1,vg,OR_PUT);
break;
case 119: /* \'w\' */
case 87: /* \'W\' */
putimage(x1,y1,wg,OR_PUT);
putpixel(x,y,c);
break;
case 114: /* \'r\' */
case 82: /* \'R\' */
putimage(x1,y1,rg,OR_PUT);
putpixel(x,y,BLACK);
break;
case 115: /* \'s\' */
case 83: /* \'S\' */
save(\"pic.dat\");
break;
case 101: /* \'e\' */
case 69: /* \'E\' */
load(\"pic.dat\");
break;
case 99: /*\'c\'*/
case 67: /*\'C\'*/
setcolor(RED);
circle(x,y,20);
break;
default:continue;
/* function for screen picture save
*/
void save(char *fname)
FILE *fp;
int i;
register long j;
char far *ptr;
fp=fopen(fname,\"wb\");
for(i=0;i<4;i++)
outportb(0x3CE,4);
outportb(0x3CF,i);
ptr=(char far *) 0xA0000000L;
for (j=0;j<38400L;j++)
putc(*ptr,fp);
ptr++;
fclose(fp);
outportb(0x3CF,0);
/* function for screen picture display
*/
void load(char *fname)
FILE *fp;
register int i;
int k4=1;
register long j;
char far *ptr;
fp=fopen(fname,\"rb\");
for (i=0;i<4;i++)
outportb(0x3C4,2);
outportb(0x3C5,k4);
ptr=(char far *)0xA0000000L;
for (j=0;j<38400L;j++)
*ptr=getc(fp);
ptr++;
k4*=2;
fclose(fp);
outportb(0x3C5,0xF);
三、結束語
該程序在Turbo C 2.0環境下運行通過,使用效果良好.可以根據具體需要,對該程序進行擴充,以增加繪圖功能.
