From 0f32b7c1eff8af7ff5cfa627472760b8e4817098 Mon Sep 17 00:00:00 2001
From: dwelle <luzar.david@gmail.com>
Date: Sun, 9 Apr 2023 19:52:18 +0200
Subject: [PATCH] wip: adaptive roughness

---
 src/renderer/renderElement.ts | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/renderer/renderElement.ts b/src/renderer/renderElement.ts
index e6f99e90d..0226b2f4a 100644
--- a/src/renderer/renderElement.ts
+++ b/src/renderer/renderElement.ts
@@ -389,6 +389,16 @@ export const setShapeForElement = <T extends ExcalidrawElement>(
 export const invalidateShapeForElement = (element: ExcalidrawElement) =>
   shapeCache.delete(element);
 
+function adjustRoughness(size: number, roughness: number): number {
+  if (size >= 50) {
+    return roughness;
+  }
+  const factor = 2 + (50 - size) / 10;
+
+  // console.log({ ret: roughness / factor, roughness, factor, size });
+  return roughness / factor;
+}
+
 export const generateRoughOptions = (
   element: ExcalidrawElement,
   continuousPath = false,
@@ -415,7 +425,10 @@ export const generateRoughOptions = (
     // calculate them (and we don't want the fills to be modified)
     fillWeight: element.strokeWidth / 2,
     hachureGap: element.strokeWidth * 4,
-    roughness: element.roughness,
+    roughness: adjustRoughness(
+      Math.min(element.width, element.height),
+      element.roughness,
+    ),
     stroke: element.strokeColor,
     preserveVertices: continuousPath,
   };