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FlatUIUtils: replaced quadratic curves with bezier curves in createRoundRectanglePath() to get perfect circle when using large arcs

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(currently only used for SwingX)
This commit is contained in:
Karl Tauber
2020-11-20 11:50:03 +01:00
parent ccd4f99aea
commit 2177ee45cc
1 changed files with 24 additions and 8 deletions
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32
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatUIUtils.java
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@@ -519,15 +519,31 @@ public class FlatUIUtils
float x2 = x + width; float x2 = x + width;
float y2 = y + height; float y2 = y + height;
// same constant as in java.awt.geom.EllipseIterator.CtrlVal used to paint circles
double c = 0.5522847498307933;
double ci = 1. - c;
double ciTopLeft = arcTopLeft * ci;
double ciTopRight = arcTopRight * ci;
double ciBottomLeft = arcBottomLeft * ci;
double ciBottomRight = arcBottomRight * ci;
Path2D rect = new Path2D.Float(); Path2D rect = new Path2D.Float();
rect.moveTo( x2 - arcTopRight, y ); rect.moveTo( x2 - arcTopRight, y );
rect.quadTo( x2, y, x2, y + arcTopRight ); rect.curveTo( x2 - ciTopRight, y,
rect.lineTo( x2, y2 - arcBottomRight ); x2, y + ciTopRight,
rect.quadTo( x2, y2, x2 - arcBottomRight, y2 ); x2, y + arcTopRight );
rect.lineTo( x + arcBottomLeft, y2 ); rect.lineTo( x2, y2 - arcBottomRight );
rect.quadTo( x, y2, x, y2 - arcBottomLeft ); rect.curveTo( x2, y2 - ciBottomRight,
rect.lineTo( x, y + arcTopLeft ); x2 - ciBottomRight, y2,
rect.quadTo( x, y, x + arcTopLeft, y ); x2 - arcBottomRight, y2 );
rect.lineTo( x + arcBottomLeft, y2 );
rect.curveTo( x + ciBottomLeft, y2,
x, y2 - ciBottomLeft,
x, y2 - arcBottomLeft );
rect.lineTo( x, y + arcTopLeft );
rect.curveTo( x, y + ciTopLeft,
x + ciTopLeft, y,
x + arcTopLeft, y );
rect.closePath(); rect.closePath();
return rect; return rect;