Drawing the same SVG with different stroke weights causes rendering bug with P2D renderer

Created by: cadin

Description

When drawing an SVG shape (with style disabled) using the P2D renderer, the rendering will glitch if the shape is drawn more than once with a different stroke weight.

Expected Behavior

The shape should appear on the canvas at different stroke weights.

Current Behavior

The first instance of the shape appears as expected. Subsequent shapes (drawn after changing strokeWeight) are drawn with a glitched stroke.

Steps to Reproduce

1. Set up sketch with P2D renderer.
2. Load an SVG into a PShape and call disableStyle() on it.
3. Draw the shape to the screen once, then change strokeWeight and draw again.

Example code (from this repo with SVG file included):

PShape aSVG;

void setup() {
  size(600, 300, P2D); // changing to default renderer works

  aSVG = loadShape("A.svg");
  aSVG.disableStyle();
}

void draw() {
  background(255);
  scale(3);

  strokeWeight(1);
  shape(aSVG); // removing this first shape works

  strokeWeight(3); // removing this stroke change works
  shape(aSVG, 100, 0);
}

Your Environment

• Processing version: 4.3
• Operating System and OS version: Mac OS 14.2.1 (Intel)

Workarounds

• Using the default renderer works as expected
• Drawing the shape only once (with any stroke weight) works as expected
• Drawing the shape multiple times without changing stroke weight works as expected
• Loading the same SVG into a separate PShape instance to render as the second graphic works as expected

Beginne mit der bereitgestellten P2D-Skizze und der SVG-Reproduktion und verfolge dann, wie der P2D-Renderer wiederholte PShape-Zeichnungen mit disabled-style und sich ändernden strokeWeight-Werten verarbeitet. Bestätige die Korrektur, indem du die Skizze reproduzierst und überprüfst, dass beide gerenderten Formen die angeforderten strokeWeight-Werte ohne Darstellungsfehler haben.