Drawing triangles in C#

John_L · 03-14-2008, 03:24 PM

So I whipped up the gesture based drawing stuff myself. But what's the best way to go about drawing Triangles in C#? If I record mouse movements and store the coordinates, I guess I need to draw three lines? But than how do I fill them in with colour? I'll probably write a "triangle" class. But any suggestions or ideas?

Rainbowinblack · 03-15-2008, 05:39 AM

You can use Graphics.DrawPoligon and Graphics.FillPoligon
both Method gets an array of Points , if there are 3 points - it'll make a triangles

can you send me the code for the gesture based drawing "stuff"?
i'm trying for a week or so to make something like that ...but i cant find how to redraw the forms...

Thanks

mike_g · 03-15-2008, 08:48 AM

If theres a built in method it will be easiest to use that. If you want to code your own filled triangle heres some very rough pseudo code for it. Having your own line drawing algo may help too.

Code:

order points from highest to lowest
get xa decrement for each y iteraion
get xb increment for each y iteration
for(y = highest; y > mid; y--)
{
    line(xa, y, xb, y);
    xa-= xa_inc; 
    xb+= xb_inc;
    
} 
repeat for mid to base

03-14-2008, 03:24 PM	#1
John_L Registered User Join Date: Sep 2007 Posts: 119	Drawing triangles in C# So I whipped up the gesture based drawing stuff myself. But what's the best way to go about drawing Triangles in C#? If I record mouse movements and store the coordinates, I guess I need to draw three lines? But than how do I fill them in with colour? I'll probably write a "triangle" class. But any suggestions or ideas?
John_L is offline

03-15-2008, 05:39 AM	#2
Rainbowinblack Registered User Join Date: Nov 2007 Posts: 14	You can use Graphics.DrawPoligon and Graphics.FillPoligon both Method gets an array of Points , if there are 3 points - it'll make a triangles can you send me the code for the gesture based drawing "stuff"? i'm trying for a week or so to make something like that ...but i cant find how to redraw the forms... Thanks
Rainbowinblack is offline

03-15-2008, 08:48 AM	#3
mike_g Dr Dipshi++ Join Date: Oct 2006 Location: On me hyperplane Posts: 1,219	If theres a built in method it will be easiest to use that. If you want to code your own filled triangle heres some very rough pseudo code for it. Having your own line drawing algo may help too. Code: order points from highest to lowest get xa decrement for each y iteraion get xb increment for each y iteration for(y = highest; y > mid; y--) { line(xa, y, xb, y); xa-= xa_inc; xb+= xb_inc; } repeat for mid to base Last edited by mike_g; 03-15-2008 at 08:51 AM.
mike_g is offline

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