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LINE.CPP
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LINE.CPP
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// LINE.CPP
// Simple line-drawing mouse thingydoodle.
#include "tile3.cpp"
#include <math.h>
#include "mouse.cpp"
void line(int X1, int Y1, int X2, int Y2, int Color);
void directline(int X1, int Y1, int X2, int Y2, int Color);
int sign(int Number);
void main(){char c;int l=-1,ox=-1,oy,ob,sx,sy;
startgraph();
while(c!='q')
{
readmouse();mousex=mousex>>1;
if(mousex!=ox||mousey!=oy)
{
directpixel(ox,oy,0);
display();
if(l==1)directline(sx,sy,mousex,mousey,15);
directpixel(mousex,mousey,15);
ox=mousex;oy=mousey;
}
if(mouseb!=ob)
{
ob=mouseb;
if(mouseb==1)
{
switch(l)
{
case 1:l*=-1;line(sx,sy,mousex,mousey,15);break;
case -1:l*=-1;sx=mousex;sy=mousey;break;
}
}
if(mouseb==2)
{
line(sx,sy,mousex,mousey,15);
sx=mousex;sy=mousey;
display();
}
//if(mouseb==1&&l==1){l*=-1;line(sx,sy,mousex,mousey,15);}
//if(mouseb==1&&l==-1){l*=-1;sx=mousex;sy=mousey;}
}
if(kbhit())c=getch();
}
}
/*void line(int X1, int Y1, int X2, int Y2, int Color)
{
int XDist,YDist;
int XDir,YDir;
int XCount,YCount;
int XYInc;
if (X1 == X2)
{
int X = X1;
if (Y1 > Y2)
{
int Temp = Y1; Y1 = Y2; Y2 = Temp;
}
for (int Y = Y1; Y <= Y2; Y++)
pixel(X,Y,Color);
}
else
{
if (Y1 == Y2)
{
int Y = Y1;
if (X1 > X2)
{
int Temp = X1; X1 = X2; X2 = Temp;
}
for (int X = X1; X <= X2; X++)
pixel(X,Y,Color);
}
}
if (!((X1 == X2) || (Y1 == Y2)))
{
XDist = X2 - X1;
YDist = Y2 - Y1;
XDir = sign(XDist);
YDir = sign(YDist);
XDist = abs(XDist);
YDist = abs(YDist);
XCount = X1;
YCount = Y1;
XYInc = 0;
while ((XCount != X2) || (YCount != Y2))
{
pixel(XCount,YCount,Color);
if (YDist < XDist)
{
XYInc += YDist;
XCount += XDir;
if (XYInc >= XDist)
{
XYInc -= XDist;
YCount += YDir;
}
}
else
{
XYInc += XDist;
YCount += YDir;
if (XYInc >= YDist)
{
XYInc -= YDist;
XCount += XDir;
}
}
}
pixel(XCount,YCount,Color);
}
}
void directline(int X1, int Y1, int X2, int Y2, int Color)
{
int XDist,YDist;
int XDir,YDir;
int XCount,YCount;
int XYInc;
if (X1 == X2)
{
int X = X1;
if (Y1 > Y2)
{
int Temp = Y1; Y1 = Y2; Y2 = Temp;
}
for (int Y = Y1; Y <= Y2; Y++)
directpixel(X,Y,Color);
}
else
{
if (Y1 == Y2)
{
int Y = Y1;
if (X1 > X2)
{
int Temp = X1; X1 = X2; X2 = Temp;
}
for (int X = X1; X <= X2; X++)
directpixel(X,Y,Color);
}
}
if (!((X1 == X2) || (Y1 == Y2)))
{
XDist = X2 - X1;
YDist = Y2 - Y1;
XDir = sign(XDist);
YDir = sign(YDist);
XDist = abs(XDist);
YDist = abs(YDist);
XCount = X1;
YCount = Y1;
XYInc = 0;
while ((XCount != X2) || (YCount != Y2))
{
directpixel(XCount,YCount,Color);
if (YDist < XDist)
{
XYInc += YDist;
XCount += XDir;
if (XYInc >= XDist)
{
XYInc -= XDist;
YCount += YDir;
}
}
else
{
XYInc += XDist;
YCount += YDir;
if (XYInc >= YDist)
{
XYInc -= YDist;
XCount += XDir;
}
}
}
directpixel(XCount,YCount,Color);
}
}
int sign(int Number){
if (Number < 0) return -1; else return +1;} */