Draw a dashed line

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Implementations

Java

```public void drawDashedLine(Graphics g,int x1,int y1,int x2,int y2,
double dashlength, double spacelength) {
if((x1==x2)&&(y1==y2)) {
g.drawLine(x1,y1,x2,y2);
return;
}
double linelength=Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
double yincrement=(y2-y1)/(linelength/(dashlength+spacelength));
double xincdashspace=(x2-x1)/(linelength/(dashlength+spacelength));
double yincdashspace=(y2-y1)/(linelength/(dashlength+spacelength));
double xincdash=(x2-x1)/(linelength/(dashlength));
double yincdash=(y2-y1)/(linelength/(dashlength));
int counter=0;
for (double i=0;i<linelength-dashlength;i+=dashlength+spacelength){
g.drawLine((int) (x1+xincdashspace*counter),
(int) (y1+yincdashspace*counter),
(int) (x1+xincdashspace*counter+xincdash),
(int) (y1+yincdashspace*counter+yincdash));
counter++;
}
if ((dashlength+spacelength)*counter<=linelength)
g.drawLine((int) (x1+xincdashspace*counter),
(int) (y1+yincdashspace*counter),
x2,y2);
}
```

Tcl

```package require Tk
pack [canvas .can -width 300 -height 200]
.can create line 50 50 200 100 -dash {2 4}
```