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[.net] C# PathGradientBrush

Numsgil · 2008-04-10T19:45:31

I'm working on a color selector in C# for a particle emitter for a game. Users select a start min and max color, and an end min and max color, and I draw a quad representing those four colors, and all the possible values in between. At present I'm using a PathGradientBrush, and set four points up as the path, and assign colors to each of them. The problem I'm having is a visual artifact: a line that runs along the diagonal of the resultant image. Visual artifact No artifact going in the other direction, though: I know why the artifact appears. It has to do with where the "center" is. Right now I'm setting the center point to the upper left corner, as it minimizes the artifact (only shows up in one direction). I'm not sure how to remove it entirely though. Ideally I'd like something that looks like a quad in DirectX or OpenGL. (clicky), but I can't figure out how to get there. I've tried looking on sites that do C# graphics tutorials, but they all seem to have that same artifact. Here's the code I'm using to set up the PathGradientBrush: brush = new PathGradientBrush(new PointF[]{ new PointF(0, 0), new PointF(0, ClientRectangle.Height), //StartB new PointF(ClientRectangle.Width, ClientRectangle.Height), //EndB new PointF(ClientRectangle.Width, 0)}); //EndA brush.CenterPoint = new PointF(0.0f, 0.0f); brush.CenterColor = StartA.Color; brush.SurroundColors = new Color[] { StartA.Color, StartB.Color, EndB.Color, EndA.Color }; Any ideas people have would be appreciated.