Drawing a polygon using doubles

[Rick]

Hi,

There's a method called drawPolygon in the java.awt.Graphics class which
takes in two integer arrays for drawing a polygon. Is there someway I
could draw a polygon using two arrays of doubles? If I convert my double
values to integer, I get an incorrect figure. Thanks


Rick

 

[Roedy Green]

If I convert my double
values to integer, I get an incorrect figure. Thanks

You are going to have to scale and round your doubles to int pixels.

See http://mindprod.com/convert.html

For another way to draw a polygon, see
http://mindprod.com/jgloss/polygon.html

 

[Rick]

Thanks Roedy, that helped.

You are going to have to scale and round your doubles to int pixels.

See http://mindprod.com/convert.html

For another way to draw a polygon, see
http://mindprod.com/jgloss/polygon.html

 

[Chris Smith]

There's a method called drawPolygon in the java.awt.Graphics class which
takes in two integer arrays for drawing a polygon. Is there someway I
could draw a polygon using two arrays of doubles? If I convert my double
values to integer, I get an incorrect figure. Thanks

You could cast your Graphics to a Graphics2D, then use draw(Shape)
providing a GeneralPath constructed of Line2D.Double objects. That
would definitely do it.

On the other hand, when you say "If I convert my double values to
integer, I get an incorrect figure", I start to wonder. Double values
would be useful for anti-aliasing to get the appearance of a better
polygon, but beyond that, the greatest precision that the screen has is
a pixel anyway, so you'd better not be getting anything too awfully
"incorrect", or a double version isn't going to fix it.

--
www.designacourse.com
The Easiest Way to Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation