Drawing Arithmatic Functions Graphically like 2x^2 in c++

by Mamoon ur Rasheed

draws graph,it can also store values for future use. it can draw upto
100
graphs of different functions at one time. hope Fully it will help
begineers a lot to learn.
it only takes value like x,2x^2.

#include<iostream.h><br /> #include<conio.h><br /> #include<stdlib.h><br /> #include<graphics.h><br /> #include<string.h><br /> #include<fstream.h><br /> #include<dos.h><br /> int i;<br /> ////////////////this class will make the first page of my<br /> program//////////<br /> class firstpage<br /> {<br /> public:<br /> void driver()<br /> {<br /> /* request auto detection */<br /> int gdriver = DETECT, gmode, errorcode;</p> <p> /* initialize graphics and local<br /> variables */<br /> initgraph(&gdriver, &gmode, “..\bgi”);</p> <p> /* read result of initialization */<br /> errorcode = graphresult();<br /> /* an error occurred */<br /> if (errorcode != grOk)<br /> {<br /> cout<<“Graphics error:<br /> “<< grapherrormsg(errorcode);<br /> cout<<“Press any key to halt:”;<br /> getch();</p> <p> exit(1); /* terminate with an error code */<br /> }</p> <p>}<br /> void front()<br /> { int midx, midy;<br /> int stangle = 45, endangle = 135;<br /> int radius = 100;</p> <p> midx = getmaxx() / 2;<br /> midy = getmaxy() / 2;<br /> setcolor(getmaxcolor());<br /> midy-=150;<br /> midx-=120;<br /> int midx2=midx+65,midy2=midy;</p> <p> int n=5,m=6;<br /> for(int i=0;i<30;i++)<br /> /* draw arc */<br /> { setcolor(n);<br /> arc(midx-90, midy, stangle-10, endangle+10, radius-40);<br /> setcolor(m);</p> <p> arc(midx2-90,midy+=2,stangle-10,endangle+10,radius-40);</p> <p> }<br /> setcolor(10);<br /> settextstyle(0,0,2);<br /> outtextxy(midx-120,midy2-30,”Grapher”);<br /> settextstyle(1,0,2);<br /> outtextxy(midx-90,midy2+30,”PARO SOFT”);</p> <p> settextstyle(10,0,2);<br /> outtextxy(midx-20,midy2+45,”BASIC GRAPHS”);</p> <p> settextstyle(0,0,1);<br /> outtextxy(midx+200,midy2+95,” (ALL RIGHTS RESERVERD) “);</p> <p> int<br /> xmove1=getmaxx()/4,ymove1=getmaxy()/2,xmove2=(getmaxx()/2)+130,ymove2=getm<br /> axy()-150;<br /> settextstyle(0,0,1);<br /> setlinestyle(0,0,3);<br /> rectangle(0,0,632,479);<br /> rectangle(getmaxx()/32,getmaxy()-30,getmaxx()-27,getmaxy()-8);<br /> rectangle(xmove1,ymove1,xmove2,ymove2);<br /> xmove1+=20;ymove1+=10;<br /> outtextxy(xmove1,ymove1,”welcome to Graph Maker”);<br /> ymove1+=20;<br /> outtextxy(xmove1,ymove1,”Version : 1.0 “);<br /> ymove1+=20;<br /> outtextxy(xmove1,ymove1,”Developer : Mamoon Ur Rasheed” );<br /> ymove1+=20;<br /> outtextxy(xmove1,ymove1,”E-mail : mamoonr@gmail.com”);</p> <p>int no1=24,no2=453,no3=48,no4=467;<br /> int a=50,b=457;<br /> for(i=0;i<=28;i++)<br /> {<br /> bar(no1,no2,no3,no4);<br /> setcolor(WHITE);<br /> outtextxy(a,b,”PLZ WAIT”);</p> <p> delay(150);<br /> setcolor(0);<br /> outtextxy(a,b,”PLZ WAIT”);<br /> // setcolor(0);<br /> // line(42,452,42,468);<br /> no3+=20;<br /> // no1+=21;<br /> a+=20;</p> <p> }</p> <p> outtextxy(220,457,”press any key to continue”);</p> <p>}</p> <p>};<br /> //////////////////////////////////////////////////////////////////////////<br /> /<br /> //value class that contains information about the values of<br /> //x axis and y axis values and have other protected data that is useful<br /> for<br /> //the drawing of graph and other calculation on the values of x and y<br /> axis<br /> //////////////////////////////////////////////////////////////////////////<br /> /<br /> class value<br /> {<br /> protected:<br /> float x[24],y[24];<br /> static float xmean,ymean;<br /> int mnx,mny,mxx,mxy,xzero,yzero;<br /> public:<br /> value()<br /> { for(i=0;i<24;i++)<br /> {x[i]=i-12;y[i]=i;} }</p> <p> value(int a)<br /> { for(i=0;i<24;i++)<br /> {x[i]=i-12;y[i]=x[i];} }</p> <p> void getvalue() ;<br /> void showvalue();<br /> void minmax() ;<br /> void xymean();<br /> void setxymean() ;<br /> };<br /> float value::xmean=0;<br /> float value::ymean=0;<br /> /////////////////////////////////////////////////////////////////////////<br /> //class that will have the function to initialize the graphic drive<br /> //<br /> //and will draw the xy lines along wiht xy values. this class has the<br /> //<br /> //ability to draw two type of graph ,1.curve graph ,2.linegraph<br /> //<br /> /////////////////////////////////////////////////////////////////////////<br /> class graph:public value<br /> { public:<br /> graph(): value()<br /> {}<br /> graph(int a): value(a)<br /> {}<br /> void graphicdriver();<br /> void xylines();<br /> void xyvalues();<br /> void linegraph();<br /> void curvegraph() ;<br /> };</p> <p>//////////////////////////////////////////////////////////////////////////<br /> //<br /> //this class contains such type of function that can get the values of<br /> ///<br /> //yaxis from an entered fuction from the<br /> user///////////////////////////////<br /> //////////////////////////////////////////////////////////////////////////<br /> //<br /> class func_value_extr:public graph<br /> {<br /> public:<br /> func_value_extr(): graph()<br /> {}<br /> void getfunctype();<br /> void ax();<br /> void ax_c();<br /> void ax_bx_c();<br /> void write_obj(char*);<br /> void write_obj_multi(func_value_extr*,int);<br /> void copy_data(char*);<br /> void read_obj(char *);<br /> };</p> <p> //////////function belongs to the value class////////////////////<br /> void value::getvalue()<br /> {<br /> cout<<“enter the value of x and y (max 24 each) “<<endl;<br /> for(i=0;i<24;i++)<br /> cin>>x[i]>>y[i];<br /> xzero=-3000;yzero=-3000;<br /> }</p> <p> void value::showvalue()<br /> {<br /> cout<<“values of x and y “<<endl;<br /> cout<<“x y”<<endl;<br /> for(i=0;i<24;i++)<br /> cout<<” “<<x[i]<<” “<<y[i]<<endl;<br /> cout<<” x axis value = “<<xmean<<“y axix value = ”<br /> <<ymean<<endl;<br /> }</p> <p> void value::minmax()<br /> {<br /> mnx=x[23];mxx=x[23];mny=y[23];mxy=y[23];<br /> for(i=0;i<24;i++)<br /> {if(x[i]<mnx)<br /> mnx=x[i];<br /> if(x[i]>mxx)<br /> mxx=x[i];<br /> if(y[i]<mny)<br /> mny=y[i];<br /> if(y[i]>mxy)<br /> mxy=y[i];<br /> if(x[i]==0)<br /> xzero=i;<br /> if(y[i]==0)<br /> yzero=i; }<br /> }</p> <p> void value::xymean()<br /> {<br /> float temp;<br /> if(mxx>(-mnx))<br /> temp=mxx;<br /> else<br /> temp=-mnx;</p> <p> xmean=temp/12;</p> <p> if(mxy>(-mnx))<br /> temp=mxy;<br /> else<br /> temp=-mny;</p> <p> ymean=temp/12;</p> <p> int no;<br /> float expo;<br /> no=xmean;<br /> expo=xmean-no;<br /> if(expo<0.1)<br /> xmean=xmean-expo;</p> <p> if(expo>=0.5)<br /> {xmean=xmean-expo; xmean++;}<br /> else<br /> if(expo>=0.1)<br /> {xmean-=expo;xmean+=0.5;}<br /> if(xmean<1)<br /> xmean=1;</p> <p> no=ymean; expo=ymean-no;<br /> if(expo<0.1)<br /> ymean=ymean-expo;</p> <p> if(expo>=0.5)<br /> {ymean=ymean-expo; ymean++;}<br /> if(expo>=0.1)<br /> {ymean-=expo; ymean+=0.5;}</p> <p> if(ymean<1)<br /> ymean=1;<br /> }</p> <p> void value::setxymean()<br /> {<br /> cout<<“enter the value for x-axis “<<endl;<br /> cin>>xmean;<br /> cout<<“enter the value for y-axis “<<endl;<br /> cin>>ymean;<br /> }</p> <p>//////////////////////////////////////////////////////////////////////////<br /> /<br /> ////////////////////////end of value class<br /> functions///////////////////////</p> <p>//////////////////////////////////////////////////////////////////////////<br /> /<br /> ///////////////////////starting of graph calss<br /> function////////////////////</p> <p>//////////////////////////////////////////////////////////////////////////<br /> /</p> <p> void graph::graphicdriver()<br /> {<br /> int gdriver = DETECT, gmode, errorcode;<br /> /* initialize graphics and local variables */<br /> initgraph(&gdriver, &gmode, “c:\tc\bgi”);</p> <p> /* read result of initialization */<br /> errorcode = graphresult();<br /> /* an error occurred */</p> <p> if (errorcode != grOk)<br /> {<br /> cout<<“Graphics error:<br /> “<< grapherrormsg(errorcode);<br /> cout<<“Press any key to halt:”;<br /> getch();<br /> exit(1);<br /> }<br /> }</p> <p> void graph::xylines()<br /> {<br /> setbkcolor(9);<br /> setcolor(4);<br /> setlinestyle(0,0,3);<br /> line(7,getmaxy()/2,getmaxx()-7,getmaxy()/2);<br /> line(getmaxx()/2,7,getmaxx()/2,getmaxy()-7);<br /> setlinestyle(0,0,1);<br /> int n=7,n2=getmaxy()/2,n3=5;<br /> for(i=0;i<25;i++)<br /> {setcolor(1);<br /> circle(n,n2,2);<br /> circle(getmaxx()/2,n3,2);<br /> n+=26;<br /> n3+=26;}<br /> }</p> <p> void graph::xyvalues()<br /> {<br /> float xval=0,yval=0;<br /> char xptr[25];<br /> char yptr[25];<br /> int no,expo;<br /> float expo_float;<br /> char temp[10];<br /> int xmove=(getmaxx()/2)+26;<br /> int ymove=(getmaxy()/2)-26;<br /> outtextxy((getmaxx()/2)-9,(getmaxy()/2)+4,”0″);<br /> setcolor(15);<br /> for(i=0;i<12;i++)<br /> {xval+=xmean;<br /> no=xval;<br /> expo_float=xval-no;<br /> expo_float*=100;<br /> expo=expo_float;<br /> if(expo!=0)<br /> {itoa(no,xptr,10);<br /> strcat(xptr,”.”);<br /> itoa(expo,temp,10);<br /> strcat(xptr,temp);}<br /> else<br /> itoa(xval,xptr,10);<br /> if(expo==0)<br /> {settextstyle(0,0,1);<br /> outtextxy(xmove,(getmaxy()/2)+5,xptr); }<br /> else<br /> { settextstyle(0,1,1);<br /> outtextxy(xmove,(getmaxy()/2)+5,xptr); }<br /> xmove+=26;<br /> yval+=ymean;<br /> no=yval;<br /> expo_float=yval-no;<br /> expo_float*=100;<br /> expo=expo_float;</p> <p> if(expo!=0)<br /> {itoa(no,yptr,10);<br /> strcat(yptr,”.”);<br /> itoa(expo,temp,10);<br /> strcat(yptr,temp); }<br /> else<br /> itoa(yval,yptr,10);</p> <p> settextstyle(0,0,1);<br /> outtextxy((getmaxx()/2)-10,ymove,yptr);<br /> outtextxy((getmaxx()/2)-10,ymove,yptr);<br /> ymove-=26;<br /> }</p> <p> xval=0;yval=0;<br /> xmove=(getmaxx()/2)-26;<br /> ymove=(getmaxy()/2)+26;</p> <p> for(i=0;i<12;i++)<br /> {xval-=xmean;<br /> no=xval;<br /> expo_float=-(xval-no);<br /> expo_float*=100;<br /> expo=expo_float;</p> <p> if(expo!=0)<br /> {itoa(no,xptr,10);<br /> strcat(xptr,”.”);<br /> itoa(expo,temp,10);<br /> strcat(xptr,temp);}<br /> else<br /> itoa(xval,xptr,10);</p> <p> if(expo==0)<br /> {settextstyle(0,0,1);<br /> outtextxy(xmove,(getmaxy()/2)+5,xptr);}<br /> else<br /> {settextstyle(0,1,1);<br /> outtextxy(xmove,(getmaxy()/2)+5,xptr);}</p> <p> xmove-=26;<br /> yval-=ymean;<br /> no=yval;<br /> expo_float=-(yval-no);<br /> expo_float*=100;<br /> expo=expo_float;</p> <p> if(expo!=0)<br /> {itoa(no,yptr,10);<br /> strcat(yptr,”.”);<br /> itoa(expo,temp,10);<br /> strcat(yptr,temp);}<br /> else<br /> itoa(yval,yptr,10);</p> <p> settextstyle(0,0,1);<br /> outtextxy((getmaxx()/2)-18,ymove,yptr);<br /> ymove+=26;<br /> }<br /> }</p> <p> void graph::linegraph()<br /> {<br /> float xline_val,yline_val;<br /> float x1,y1,x2,y2;<br /> setcolor(222);<br /> for(i=1;i<24;i++)<br /> {<br /> if(x[i]>=0 )<br /> {xline_val=x[i]/xmean;<br /> xline_val*=26;<br /> yline_val=y[i]/ymean;<br /> yline_val*=26;<br /> x1=(getmaxx()/2)+xline_val;<br /> y1=getmaxy()/2;<br /> x2=x1;<br /> y2=(getmaxy()/2)-yline_val;<br /> line(x1,y1,x2,y2); delay(200);}</p> <p> else<br /> if(x[i]<0 )<br /> {xline_val=-(x[i]/xmean);<br /> xline_val*=26;<br /> yline_val=y[i]/ymean;<br /> yline_val*=26;<br /> x1=(getmaxx()/2)-xline_val;<br /> y1=getmaxy()/2;<br /> x2=x1;<br /> y2=(getmaxy()/2)-yline_val;<br /> line(x1,y1,x2,y2);delay(200);}<br /> }<br /> }</p> <p> void graph::curvegraph()<br /> {<br /> float xline_val,yline_val,x1,y1,x2,y2;</p> <p> xline_val=x[0]/xmean;<br /> xline_val*=26;<br /> yline_val=y[0]/ymean;<br /> yline_val*=26;</p> <p> x1=(getmaxx()/2)+xline_val;<br /> y1=(getmaxy()/2)-yline_val;<br /> for(i=1;i<24;i++)<br /> {xline_val=x[i]/xmean;<br /> xline_val*=26;<br /> yline_val=y[i]/ymean;<br /> yline_val*=26;</p> <p> x2=(getmaxx()/2)+xline_val;<br /> y2=(getmaxy()/2)-yline_val;<br /> line(x1,y1,x2,y2);<br /> delay(200);<br /> x1=x2;y1=y2;<br /> }<br /> }<br /> //////////////////////////////////////////////////////////////////////////<br /> /<br /> //////////////////end of value graph functions<br /> ////////////////////////////<br /> //////////////////////////////////////////////////////////////////////////<br /> /<br /> ///////////starting of func_value_extr class<br /> functions/////////////////////<br /> //////////////////////////////////////////////////////////////////////////<br /> /</p> <p>void func_value_extr::getfunctype()<br /> {<br /> cout<<” choose function type “<<endl;<br /> cout<<” 1.ax^n<br /> 2.ax^n+c<br /> 3.ax^n+bx^n+c “<<endl;<br /> char choic[20],c=’y’;<br /> int choice;</p> <p>i=0;<br /> while(c==’y’)<br /> {</p> <p>cin>>choic;<br /> clrscr();<br /> if(choic[0]==’1’||choic[0]==’2’||choic[0]==’3′)<br /> {if(choic[1]==’