GLGraphics Stoke Problem

lual3x

in Contributed Library Questions • 11 months ago

Hi,

I've been trying to draw ellipses with strokes with GLGraphics as my main renderer. However, for some reason the stroke ends up having a weird jagged texture that doesn't happen when I other renderers. I tried using PGraphics and rendering the ellipse's stroke using P2D, but it just doesn't show up at all. Does anyone know how to fix this? It also becomes transparent for some reason...

I have also attached an image of the problem in a quick test window (might need to view full size of image to see the problem). Imgur Link

Thanks!

Replies(2)

amnon.owed

Re: GLGraphics Stoke Problem

11 months ago

The best way to solve this is to draw it yourself using TRIANGLE_STRIP.

Code Example

import processing.opengl.*;
import codeanticode.glgraphics.*;
void setup() {
size(500, 500, GLConstants.GLGRAPHICS);
}
void draw() {
background(0);
drawRing(mouseX, mouseY, 50, 100, 100, color(0, 255, 155));
}
void drawRing(float x, float y, float innerRad, float outerRad, int numPoints, int col) {
float theta = 2*TWO_PI/numPoints;
pushMatrix();
translate(x, y);
noStroke();
fill(col);
beginShape(TRIANGLE_STRIP);
for (int i=0; i<numPoints; i++) {
float angle = i*theta;
float ca = cos(angle);
float sa = sin(angle);
vertex(ca*outerRad, sa*outerRad);
vertex(ca*innerRad, sa*innerRad);
}
endShape();
popMatrix();
}

v.k.

Re: GLGraphics Stoke Problem

11 months ago

Or even just two concentric ellipses, first with noStroke and filled with the color you want the ring and second same color as background. If the background is a solid color it should work :). But amnon way is much better and elegant.

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