C语言有丰富的数据结构和运算符。包含了各种数据结构，如整型、数组类型、指针类型和联合类型等，用来实现各种数据结构的运算。以下是小编为大家搜索整理的C语言如何实现画图教程，希望能给大家带来帮助!更多精彩内容请及时关注我们考试网!
程序中定义了几个特殊键：
"V”：画笔提起
"W”：开始画图
"R”：开始擦图
"S”：当前图形存入文件
"E”：调出已有文件
"C”：画圆
程序一运行，屏幕上出现一个黄色的边框来设定画图的区域，区域中间出现提起的画笔符号 ，当按下”W“键时，画笔符号变为 ，此时可移动方向键上、下、左、右、左上、左下、右上、右下来画图;当按下”R“键时，画笔符号变为 ，此时可移动方向键来擦图;在画图过程中，按下“C”键，可画出一个半径为20个象素点的圆;当结束画图时，按下“S”键，将画好的图形存盘;按下“E”键可调出已有的图形进行编辑。
3.源程序清单
# 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: c";
/* write the pen */
bar200,10,206,16;
line203,7,200,10;
line203,7,206,10;
line243,7,240,16;
line243,7,246,16;
line283,7,280,10;
line283,7,286,10;
line283,7,283,16;
/* save the pen */
wg=mallocimagesize200,7,206,16;
rg=mallocimagesize240,7,246,16;
vg=mallocimagesize280,7,286,16;
fy=mallocimagesize200,7,206,16;
getimage200,7,206,16,wg;
getimage240,7,246,16,rg;
getimage280,7,286,16,vg;
cleardevice;
/* write the box */
setcolorYELLOW;
rectangle4,19,637,447;
x1=x-3;
y1=y+1;
x2=x+3;
y2=y+10;
getimagex1,y1,x2,y2,fy;
putimagex1,y1,vg,XOR_PUT;
/* receive the command */
for ;;
while bioskey1==0;
k=bioskey0;
putimagex1,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 */
switchk1
case 45:
restorecrtmode;
exit0;
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;