計算機圖形學4.

1、EdgeMarkFill(intEdgeMarkFill(int p2,int p2,int n,intn,int boundarycolorboundarycolor, , ntnt newcolornewcolor) ) intint i,x,y,flag,xmin,xmax,ymin,ymaxi,x,y,flag,xmin,xmax,ymin,ymax; ;setcolor(boundarycolorsetcolor(boundarycolor); /); /* *設置畫筆色設置畫筆色* */ / / /* *畫出多邊形的畫出多邊形的n n條邊條邊* */ /for(i=0 ;in;i+

2、)for(i=0 ;in;i+)line(pi0,pi1,p(i+1)%n0,p(i+1)%n)1); line(pi0,pi1,p(i+1)%n0,p(i+1)%n)1); 用求極值的算法，從多邊形頂點數組用求極值的算法，從多邊形頂點數組p p中，中， 求出求出xmin,xmax,ymin,ymaxxmin,xmax,ymin,ymax; ;for(y=for(y=ymin;yymin;y=ymax;yymax;y+) +) flag=-1;flag=-1;for(x=for(x=xmin;xxmin;x=xmax;xxmax;x+) +) if(getpixel(x,yif(getpixe

3、l(x,y)=)=boundarycolorboundarycolor) )flag=-flag;flag=-flag;if(flag=1)if(flag=1)putpixel(x,yputpixel(x,y, , newcolornewcolor);); void boundaryFill4(int void boundaryFill4(int x,intx,int y,inty,int fill,intfill,int boundary) boundary) intint current; current; current= current=getPixel(x,ygetPixel(x,y

4、);); if (current!=boundary) &(current!=fill) if (current!=boundary) &(current!=fill) setColor(fillsetColor(fill);); setPixel(x,ysetPixel(x,y);); boundaryFill4(x+1,y,fill,boundary); boundaryFill4(x+1,y,fill,boundary); boundaryFill4(x-1,y,fill,boundary); boundaryFill4(x-1,y,fill,boundary); bou

5、ndaryFill4(x,y+1,fill,boundary); boundaryFill4(x,y+1,fill,boundary); boundaryFill4(x,y-1,fill,boundary); boundaryFill4(x,y-1,fill,boundary); 0123456123456void floodFill4(int void floodFill4(int x,intx,int y,inty,int fill,intfill,int oldcoloroldcolor) ) intint current; current; current= current=getPi

6、xel(x,ygetPixel(x,y);); if (current= if (current=oldcoloroldcolor) setColor(fillsetColor(fill);); setPixel(x,ysetPixel(x,y);); floodFill4(x+1,y,fill, floodFill4(x+1,y,fill, oldcoloroldcolor);); floodFill4(x-1,y,fill, floodFill4(x-1,y,fill, oldcoloroldcolor);); floodFill4(x,y+1,fill, floodFill4(x,y+1