I wanted to draw some transparent shapes for debugging and I spotted this:
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Gdx.gl11.glEnable(GL10.GL_BLEND);
Gdx.gl11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
renderer.begin(ShapeRenderer.ShapeType.FilledCircle);
renderer.setColor(1, 0, 0, 0.4f);
renderer.filledCircle(0, 0, 100, 30);
renderer.end();
Yeah... it draws one additional triangle where there was one already, so they overlap
A little fix for ShapeRenderer code here:
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int inc = 360 / segments;
float angle = 2 * 3.1415926f / segments;
float cos = MathUtils.cos(angle);
float sin = MathUtils.sin(angle);
float cx = radius, cy = 0;
for (int i = 0; i < segments-1; i++) {
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x, y, 0);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x + cx, y + cy, 0);
float temp = cx;
cx = cos * cx - sin * cy;
cy = sin * temp + cos * cy;
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x + cx, y + cy, 0);
}
//drawing last segment
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x, y, 0);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x + cx, y + cy, 0);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x + radius, y, 0);
I changed "<=segments" to "<segments-1" and I draw last segment out of loop, so the last vertice c is the same as b in first triangle
Also, shaperenderer doesnt let you draw polygond/triangles...
It should!
If you let me draw at least triangles, then I can draw polygons pretty easily.
So I suggest adding Triangle and FilledTriagle ShapeType
Some code, so you can just copy&paste and dont have to waste time writing it:
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public void triangle(float x1, float y1, float x2, float y2, float x3, float y3)
{
if (currType != ShapeType.Triangle) throw new GdxRuntimeException("Must call begin(ShapeType.Triangle)");
checkDirty();
checkFlush(6);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x1, y1, 0);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x2, y2, 0);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x2, y2, 0);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x3, y3, 0);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x3, y3, 0);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x1, y1, 0);
}
public void filledTriangle(float x1, float y1, float x2, float y2, float x3, float y3)
{
if (currType != ShapeType.FilledTriangle) throw new GdxRuntimeException("Must call begin(ShapeType.FilledTriangle)");
checkDirty();
checkFlush(3);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x1, y1, 0);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x2, y2, 0);
renderer.color(color.r, color.g, color.b, color.a);
renderer.vertex(x3, y3, 0);
}
