Improved quality of small arcs.

dmester · dmester · commit 06aa9fb3ee98 · 2018-04-14T16:58:38.000+02:00
diff --git a/lib/canvasContext.js b/lib/canvasContext.js
@@ -252,11 +252,11 @@ CanvasContext.prototype.arc = function CanvasContext_arc(x, y, radius, startAngl
         return;
     }
 
-    const ARC_LENGTH_PIXELS = 3;
+    const TARGET_CHORD_LENGTH_PIXELS = 3;
     
-    var sectors = Math.floor((Math.PI * radius * 2) / ARC_LENGTH_PIXELS);
-    if (sectors < 4) {
-        sectors = 4;
+    var sectors = Math.floor((Math.PI * radius * 2) / TARGET_CHORD_LENGTH_PIXELS);
+    if (sectors < 9) {
+        sectors = 9;
     }
     
     var sectorAngle = Math.PI * 2 / sectors;

Original file line number	Diff line number	Diff line change
`@@ -252,11 +252,11 @@ CanvasContext.prototype.arc = function CanvasContext_arc(x, y, radius, startAngl`
`252`	`252`	`return;`
`253`	`253`	`}`
`254`	`254`
`255`		`- const ARC_LENGTH_PIXELS = 3;`
	`255`	`+ const TARGET_CHORD_LENGTH_PIXELS = 3;`
`256`	`256`
`257`		`- var sectors = Math.floor((Math.PI * radius * 2) / ARC_LENGTH_PIXELS);`
`258`		`- if (sectors < 4) {`
`259`		`- sectors = 4;`
	`257`	`+ var sectors = Math.floor((Math.PI * radius * 2) / TARGET_CHORD_LENGTH_PIXELS);`
	`258`	`+ if (sectors < 9) {`
	`259`	`+ sectors = 9;`
`260`	`260`	`}`
`261`	`261`
`262`	`262`	`var sectorAngle = Math.PI * 2 / sectors;`