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Title Program to implement Polygon Filling Algorithm.
Category C++ » Computer Graphics
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#include<stdio.h> #include<conio.h> #include<iostream.h> #include<graphics.h> #include<dos.h> #include<stdlib.h> int gd=DETECT,gm; class myStack { private: int arr[10000][2],top; public: myStack() { top=-1; } void push(int x,int y) { if(top>10000) { printf(" a " Stack Full...:-(""); exit(0); } top++; arr[top][0]=x; arr[top][1]=y; } void pop(int &x,int &y) { x=arr[top][0]; y=arr[top][1]; top--; } int empty(void) { if(top==-1) return(1); else return(0); } }; void show_quadrant() { cleardevice(); rectangle(120,40,320,240); rectangle(320,40,520,240); rectangle(120,240,320,440); rectangle(320,240,520,440); for(int i=130;i<=510;i+=10) { if(i==320) continue; outtextxy(i,237,"+"); } for(i=50;i<=430;i+=10) { if(i==240) continue; outtextxy(317,i,"-"); } outtextxy(310,230,"O"); outtextxy(530,240,"X"); outtextxy(320,450,"-Y"); outtextxy(100,240,"-X"); outtextxy(320,30,"Y"); } int get_poly(int ed[20]) { int edg,i,j; clearviewport(); closegraph(); cout<<" " Enter No. Of Edges ":="; cin>>edg; for(i=0,j=1;i<2*edg;i+=2,j++) { cout<<" " Enter Vertex No. "<<j<<" ":= "; flushall(); cin>>ed[i]>>ed[i+1]; ed[i]+=320; ed[i+1]=240-ed[i+1]; } ed[i]=ed[0]; ed[i+1]=ed[1]; initgraph(&gd,&gm,"..\bgi"); clearviewport(); show_quadrant(); drawpoly(edg+1,ed); return(edg); } void get_y(int &min,int &max,int edge[20],int size) { int i; min=480; max=0; for(i=1;i<2*size;i+=2) { if(edge[i]>max) max=edge[i]; if(edge[i]<min) min=edge[i]; } } void get_x(int &min,int &max,int edge[20],int size) { int i; min=480; max=0; for(i=0;i<2*size;i+=2) { if(edge[i]>max) max=edge[i]; if(edge[i]<min) min=edge[i]; } } void fill_polygon(int x,int y,int fg,int bg) { myStack stack; int col; putpixel(x,y,fg); stack.push(x,y); while(!stack.empty()) { stack.pop(x,y); col=getpixel(x,y); if(col!=bg&&col!=fg) putpixel(x,y,fg); col=getpixel(x,y+1); if(col!=bg&&col!=fg) stack.push(x,y+1); col=getpixel(x+1,y); if(col!=bg&&col!=fg) stack.push(x+1,y); col=getpixel(x-1,y); if(col!=bg&&col!=fg) stack.push(x-1,y); col=getpixel(x,y-1); if(col!=bg&&col!=fg) stack.push(x,y-1); } } void flood_fill(int ed[20]) { int i,j,x,y,num,bg,fg,col,k; clearviewport(); closegraph(); cout<<" " Enter No Of Edges ":= "; cin>>num; for(i=0,k=1;i<2*num;i+=2,k++) { cout<<" " Enter The Vertex No "<<k<<" ":="; flushall(); cin>>ed[i]>>ed[i+1]; ed[i]+=320; ed[i+1]=240-ed[i+1]; } ed[i]=ed[0]; ed[i+1]=ed[1]; cout<<" " Enter The Seed Point (x,y) ":= "; cin>>x>>y; x+=320; y=240-y; initgraph(&gd,&gm,"..\bgi"); cleardevice(); show_quadrant(); setcolor(1); drawpoly(num+1,ed); fill_polygon(x,y,15,1); } int check_mid(int i,int ed[20],int k) { int max,min; if(ed[k+1]>ed[k+3]) { max=ed[k+1]; min=ed[k+3]; } if(ed[k+1]<ed[k+3]) { max=ed[k+3]; min=ed[k+1]; } if(i>min&&i<max) return(1); else return(0); } void scan_poly(int ed[20],int num) { int i,j,k,xmax,xmin,ymax,ymin,p; void sort(float xi[10],int n); float xi[10]; get_y(ymin,ymax,ed,num); get_x(xmin,xmax,ed,num); for(i=ymin;i<=ymax;i++) { p=0; for(k=0;k<2*num;k+=2) { if(ed[k+1]==ed[k+3]) continue; xi[p] = ed[k]+((double)((double)(i-ed[k+1])/(ed[k+1]-ed[k+3]))*(ed[k]-ed[k+2])); if(xi[p]>=xmin&&xi[p]<=xmax) p++; } sort(xi,p); for(j=0;j<p;j+=2) line(xi[j],i,xi[j+1],i); } } void sort(float xi[10],int n) { int i,j; for(i=0;i<n-1;i++) { for(j=0;j<n-1;j++) { if(xi[j]>xi[j+1]) { float temp; temp=xi[j]; xi[j]=xi[j+1]; xi[j+1]=temp; } } } } void edge_fill(int ed[20],int num) { int i,j,k,xmax,xmin,ymax,ymin,col; double xint; get_y(ymin,ymax,ed,num); get_x(xmin,xmax,ed,num); for(k=0;k<2*num;k+=2) { for(i=ymin;i<=ymax;i++) { if(ed[k+1]==ed[k+3]) continue; if(!check_mid(i,ed,k)) continue; xint = ed[k]+(((double)(i-ed[k+1])/(ed[k+1]-ed[k+3]))*(ed[k]-ed[k+2])); for(j=xmin;j<=xmax;j++) { if(j>xint) { col=getpixel(j,i); if(col==15) putpixel(j,i,0); if(col==0) putpixel(j,i,15); } } } } } void main() { clrscr(); char *mess[]={"-","=","["," ","P","o","l","y","g","o","n"," ", "F","i","l","l","i","n","g"," ","]","=","-",}; int xx=28,xxx=51,i,j; _setcursortype(_NOCURSOR); for(i=0,j=22;i<13,j>=11;i++,j--) { gotoxy(xx,1); cout<<mess[i]; xx++; gotoxy(xxx,1); cout<<mess[j]; xxx--; delay(50); } xx=30;xxx=49; int choice,ed[20],num; _setcursortype(_NORMALCURSOR); cout<<" 1:==>" Flood Fill ""; cout<<" 2:==>" Ordered Edge List Fill ""; cout<<" 3:==>" Edge Fill ""; cout<<" 4:==>" Exit ""; cout<<" " Enter Your Choice ":="; cin>>choice; initgraph(&gd,&gm,"..\bgi"); clearviewport(); switch(choice) { case 1: flood_fill(ed); getch(); break; case 2: num=get_poly(ed); scan_poly(ed,num); getch(); break; case 3: num=get_poly(ed); edge_fill(ed,num); getch(); break; case 4: exit(0); default: cout<<" a" Press A Valid Key...!!! ""; getch(); main(); break; } closegraph(); }

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