C語言如何實(shí)現(xiàn)畫圖教程

C語言如何實(shí)現(xiàn)畫圖教程程序中定義了幾個(gè)特殊鍵："V”：畫筆提起"W”：開始畫圖"R”：開始擦圖"S”：當(dāng)前圖形存入文件"E”：調(diào)出已有文件"C”：畫圓程序一運(yùn)行，屏幕上出現(xiàn)一個(gè)黃色的邊框來設(shè)定畫圖的.區(qū)域，區(qū)域中間出現(xiàn)提起的畫筆符號，當(dāng)按下”W“鍵時(shí)，畫筆符號變?yōu)?，此時(shí)可移動方向鍵(上、下、左、右、左上、左下、右上、右下)來畫圖;當(dāng)按下”R“鍵時(shí)，畫筆符號變?yōu)椋藭r(shí)可移動方向鍵來擦圖;在畫圖過程中，按下“C”鍵，可畫出一個(gè)半徑為20個(gè)象素點(diǎn)的圓;當(dāng)結(jié)束畫圖時(shí)，按下“S”鍵，將畫好的圖形存盤;按下“E”鍵可調(diào)出已有的圖形進(jìn)行編輯。3.源程序清單#include"graphics.h"#include"stdio.h"#include"fcntl.h"#include"stdlib.h"main()voidsave(),load();void*wg,*rg,*vg,*fy;intdriver,mode;intc=RED;intx=320,y=225;intx1,y1,x2,y2;intk,k1,k2;/*initializegrapher*/detectgraph(&driver,&mode);initgraph(&driver,&mode,"c:\tc");/*writethepen*/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);/*savethepen*/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();/*writethebox*/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);/*receivethecommand*/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;/*k1isthespecialkeyvalue*/elsek2=k&0x00ff;/*k2isthenon-specialkeyvalue*/if(((k&0x00ff)|0x00)==0)/*Specialkey*/switch(k1)case45:restorecrtmode();exit(0);case72:if(y>20)y=y-1;break;case75:if(x>5)x=x-1;break;case77:if(x<636)x=x+1;break;case80:if(y<446)y=y+1;break;case71:if((x>5)&&(y>20))x=x-1;y=y-1;break;case79:if((x>5)&&(y<446))x=x-1;y=y+1;break;case73:if((x<636)&&(y>20))x=x+1;y=y-1;break;case81: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-specialkey*/switch(k2)case118:/*'v'*/case86:/*'V'*/putimage(x1,y1,vg,OR_PUT);break;case119:/*'w'*/case87:/*'W'*/putimage(x1,y1,wg,OR_PUT);putpixel(x,y,c);break;case114:/*'r'*/case82:/*'R'*/putimage(x1,y1,rg,OR_PUT);putpixel(x,y,BLACK);break;case115:/*'s'*/case83:/*'S'*/save("pic.dat");break;case101:/*'e'*/case69:/*'E'*/load("pic.dat");break;case99:/*'c'*/case67:/*'C'*/setcolor(RED);circle(x,y,20);break;default:continue;/*functionforscreenpicturesave*/voidsave(char*fname)FILE*fp;inti;registerlongj;charfar*ptr;fp=fopen(fname,"wb");for(i=0;i<4;i++)outportb(0x3CE,4);outportb(0x3CF,i);ptr=(charfar*)0xA0000000L;for(j=0;j<38400L;j++)putc(*ptr,fp);ptr++;fclose(fp);outportb(0x3CF,0);/*functionforscreenpicturedisplay*/voidload(char*fname)FILE*fp;registerinti;intk4=1;registerlongj;charfar*ptr;fp=fopen(fname,"rb");for(i=0;i<4;i++)outportb(0x3C4,2);outportb(0x3C5,k4);ptr=(charfar*)0xA000