cannot get polygon sides to meet

developer forums

Dark GDK / cannot get polygon sides to meet

Author

Message

tripleF

Years of Service

User Offline

Joined: 4th Jun 2006

Location:

Posted: 20th Mar 2007 10:00

Link

Hi, i am trying to draw polygons.The problem is i cannot get the the last side drawn to meet up with the first drawn, why?

+ Code Snippet

#include "DarkGDK.h" 

void DarkGDK ( void )
{ 
	int sides=8;
	
	int startx=50;
	int starty=300;
	int x=50;
	int y=250;
	float intangle=((180*sides)-360)/sides ;
	float exangle=180-intangle;
	dbSyncOn ();

	while (LoopGDK ( ) )
 {
for (int l=0;l<sides;l++)
	{
		dbText(10,10,"hello");
		

		
		x = startx + (dbCOS(l*exangle) * 40);
		y = starty + (dbSIN(l*exangle) * 40);
		dbLine(startx,starty,x,y);
		startx=x;
		starty=y;
		
		
	}
	startx=50;
	starty=300;
	x=50;
	y=250;
	
	dbSync ( );

 }
}

Profile PM

lwatson

Years of Service

User Offline

Joined: 17th Nov 2006

Location: Lincoln, RI USA

Posted: 20th Mar 2007 19:49 Edited at: 20th Mar 2007 19:50

Link

Not entirely sure but I believe if you change the l<sides to read l<=sides that should do the trick for you

Or you could keep track of the first point drawn and do an implicit dbline() from the current point to the first point just outside of the loop.

Lonnie Allen Watson
rmag.blogspot.com (blog)

Profile PM Email Website

Server time is: 2024-10-09 02:20:02
Your offset time is: 2024-10-09 02:20:02

Sorry your browser is not supported!

Dark GDK / cannot get polygon sides to meet