fixed HiDPIUtils.paintAtScale1x(), which painted at wrong location if graphics is rotated, is scaled and x or y parameters are not zero (issue #646)

CHANGELOG.md

@@ -37,6 +37,9 @@ FlatLaf Change Log
 - Tree: Fixed truncated node text and too small painted non-wide node background
   if custom cell renderer sets icon, but not disabled icon, and tree is
   disabled. (issue #640)
+- Fixed `HiDPIUtils.paintAtScale1x()`, which painted at wrong location if
+  graphics is rotated, is scaled and `x` or `y` parameters are not zero. (issue
+  #646)
 
 
 ## 3.0

flatlaf-core/src/main/java/com/formdev/flatlaf/util/HiDPIUtils.java

@@ -52,40 +52,47 @@ public class HiDPIUtils
 		AffineTransform t = g.getTransform();
 
 		// get scale X/Y and shear X/Y
-		double scaleX = t.getScaleX();
-		double scaleY = t.getScaleY();
-		double shearX = t.getShearX();
-		double shearY = t.getShearY();
+		final double scaleX = t.getScaleX();
+		final double scaleY = t.getScaleY();
+		final double shearX = t.getShearX();
+		final double shearY = t.getShearY();
 
 		// check whether rotated
 		// (also check for negative scale X/Y because shear X/Y are zero for 180 degrees rotation)
 		boolean rotated = (shearX != 0 || shearY != 0 || scaleX <= 0 || scaleY <= 0);
+
+		// calculate non rotated scale factors
+		final double realScaleX, realScaleY;
 		if( rotated ) {
 			// resulting scale X/Y values are always positive
-			scaleX = Math.hypot( scaleX, shearX );
-			scaleY = Math.hypot( scaleY, shearY );
+			realScaleX = Math.hypot( scaleX, shearX );
+			realScaleY = Math.hypot( scaleY, shearY );
 		} else {
 			// make scale X/Y positive
-			scaleX = Math.abs( scaleX );
-			scaleY = Math.abs( scaleY );
+			realScaleX = Math.abs( scaleX );
+			realScaleY = Math.abs( scaleY );
 		}
 
 		// check whether scaled
-		if( scaleX == 1 && scaleY == 1 ) {
+		if( realScaleX == 1 && realScaleY == 1 ) {
 			painter.paint( g, x, y, width, height, 1 );
 			return;
 		}
 
+		// calculate x and y (this is equal to t.translate( x, y ))
+		double px = (x * scaleX) + (y * shearX) + t.getTranslateX();
+		double py = (y * scaleY) + (x * shearY) + t.getTranslateY();
+
 		// scale rectangle
-		Rectangle2D.Double scaledRect = scale( scaleX, scaleY, t, x, y, width, height );
+		Rectangle2D.Double scaledRect = scale( realScaleX, realScaleY, px, py, width, height );
 
 		try {
 			// unscale to factor 1.0, keep rotation and move origin (to whole numbers)
 			AffineTransform t1x;
 			if( rotated ) {
-				t1x = new AffineTransform( t.getScaleX(), t.getShearY(), t.getShearX(), t.getScaleY(),
+				t1x = new AffineTransform( scaleX, shearY, shearX, scaleY,
 					Math.floor( scaledRect.x ), Math.floor( scaledRect.y ) );
-				t1x.scale( 1. / scaleX, 1. / scaleY );
+				t1x.scale( 1. / realScaleX, 1. / realScaleY );
 			} else
 				t1x = new AffineTransform( 1, 0, 0, 1, Math.floor( scaledRect.x ), Math.floor( scaledRect.y ) );
 			g.setTransform( t1x );
@@ -94,7 +101,7 @@ public class HiDPIUtils
 			int sheight = (int) scaledRect.height;
 
 			// paint
-			painter.paint( g, 0, 0, swidth, sheight, scaleX );
+			painter.paint( g, 0, 0, swidth, sheight, realScaleX );
 		} finally {
 			// restore original transform
 			g.setTransform( t );
@@ -106,10 +113,7 @@ public class HiDPIUtils
 	 * sun.java2d.pipe.PixelToParallelogramConverter.fillRectangle(),
 	 * which is used by Graphics.fillRect().
 	 */
-	private static Rectangle2D.Double scale( double scaleX, double scaleY, AffineTransform t, int x, int y, int width, int height ) {
-		double px = (x * scaleX) + t.getTranslateX();
-		double py = (y * scaleY) + t.getTranslateY();
-
+	private static Rectangle2D.Double scale( double scaleX, double scaleY, double px, double py, int width, int height ) {
 		double newX = normalize( px );
 		double newY = normalize( py );
 		double newWidth  = normalize( px + (width  * scaleX) ) - newX;

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatPaintingHiDPITest.java

@@ -40,10 +40,13 @@ public class FlatPaintingHiDPITest
 
 	FlatPaintingHiDPITest() {
 		initComponents();
+		reset();
 		sliderChanged();
 	}
 
 	private void sliderChanged() {
+		painter.originX = originXSlider.getValue();
+		painter.originY = originYSlider.getValue();
 		painter.translateX = translateXSlider.getValue();
 		painter.translateY = translateYSlider.getValue();
 		painter.scaleX = scaleXSlider.getValue();
@@ -78,15 +81,23 @@ public class FlatPaintingHiDPITest
 	}
 
 	private void reset() {
+		AffineTransform t = getGraphicsConfiguration().getDefaultTransform();
+
+		originXSlider.setValue( 20 );
+		originYSlider.setValue( 10 );
 		translateXSlider.setValue( 100 );
 		translateYSlider.setValue( 100 );
-		scaleXSlider.setValue( 100 );
-		scaleYSlider.setValue( 100 );
+		scaleXSlider.setValue( (int) (t.getScaleX() * 100) );
+		scaleYSlider.setValue( (int) (t.getScaleY() * 100) );
 		rotateSlider.setValue( 0 );
 	}
 
 	private void initComponents() {
 		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
+		JLabel originXLabel = new JLabel();
+		originXSlider = new JSlider();
+		JLabel originYLabel = new JLabel();
+		originYSlider = new JSlider();
 		JLabel translateXLabel = new JLabel();
 		translateXSlider = new JSlider();
 		JLabel translateYLabel = new JLabel();
@@ -128,30 +139,58 @@ public class FlatPaintingHiDPITest
 			"[400,fill]para" +
 			"[grow,fill]",
 			// rows
-			"[fill]" +
+			"[]" +
+			"[]" +
+			"[]" +
 			"[]" +
 			"[]" +
 			"[]" +
 			"[]" +
 			"[grow]"));
 
+		//---- originXLabel ----
+		originXLabel.setText("OriginX:");
+		add(originXLabel, "cell 0 0");
+
+		//---- originXSlider ----
+		originXSlider.setMaximum(500);
+		originXSlider.setMajorTickSpacing(100);
+		originXSlider.setMinorTickSpacing(25);
+		originXSlider.setValue(20);
+		originXSlider.setPaintTicks(true);
+		originXSlider.addChangeListener(e -> sliderChanged());
+		add(originXSlider, "cell 1 0");
+
+		//---- originYLabel ----
+		originYLabel.setText("OriginY:");
+		add(originYLabel, "cell 0 1");
+
+		//---- originYSlider ----
+		originYSlider.setMaximum(500);
+		originYSlider.setPaintLabels(true);
+		originYSlider.setPaintTicks(true);
+		originYSlider.setMajorTickSpacing(100);
+		originYSlider.setMinorTickSpacing(25);
+		originYSlider.setValue(10);
+		originYSlider.addChangeListener(e -> sliderChanged());
+		add(originYSlider, "cell 1 1");
+
 		//---- translateXLabel ----
 		translateXLabel.setText("TranslateX:");
-		add(translateXLabel, "cell 0 0");
+		add(translateXLabel, "cell 0 2");
 
 		//---- translateXSlider ----
 		translateXSlider.setMaximum(500);
-		translateXSlider.setPaintLabels(true);
 		translateXSlider.setPaintTicks(true);
 		translateXSlider.setMajorTickSpacing(100);
 		translateXSlider.setMinorTickSpacing(25);
 		translateXSlider.setValue(100);
 		translateXSlider.addChangeListener(e -> sliderChanged());
-		add(translateXSlider, "cell 1 0");
+		add(translateXSlider, "cell 1 2");
 
 		//---- translateYLabel ----
 		translateYLabel.setText("TranslateY:");
-		add(translateYLabel, "cell 0 1");
+		add(translateYLabel, "cell 0 3");
 
 		//---- translateYSlider ----
 		translateYSlider.setMaximum(500);
@@ -161,30 +200,29 @@ public class FlatPaintingHiDPITest
 		translateYSlider.setMinorTickSpacing(25);
 		translateYSlider.setValue(100);
 		translateYSlider.addChangeListener(e -> sliderChanged());
-		add(translateYSlider, "cell 1 1");
+		add(translateYSlider, "cell 1 3");
 
 		//---- scaleXLabel ----
 		scaleXLabel.setText("ScaleX:");
-		add(scaleXLabel, "cell 0 2");
+		add(scaleXLabel, "cell 0 4");
 
 		//---- scaleXSlider ----
-		scaleXSlider.setMaximum(300);
+		scaleXSlider.setMaximum(400);
 		scaleXSlider.setValue(100);
 		scaleXSlider.setPaintTicks(true);
-		scaleXSlider.setPaintLabels(true);
 		scaleXSlider.setMajorTickSpacing(50);
 		scaleXSlider.setSnapToTicks(true);
 		scaleXSlider.setMinorTickSpacing(10);
 		scaleXSlider.setMinimum(-100);
 		scaleXSlider.addChangeListener(e -> sliderChanged());
-		add(scaleXSlider, "cell 1 2");
+		add(scaleXSlider, "cell 1 4");
 
 		//---- scaleYLabel ----
 		scaleYLabel.setText("ScaleY:");
-		add(scaleYLabel, "cell 0 3");
+		add(scaleYLabel, "cell 0 5");
 
 		//---- scaleYSlider ----
-		scaleYSlider.setMaximum(300);
+		scaleYSlider.setMaximum(400);
 		scaleYSlider.setValue(100);
 		scaleYSlider.setPaintTicks(true);
 		scaleYSlider.setPaintLabels(true);
@@ -193,11 +231,11 @@ public class FlatPaintingHiDPITest
 		scaleYSlider.setMinorTickSpacing(10);
 		scaleYSlider.setMinimum(-100);
 		scaleYSlider.addChangeListener(e -> sliderChanged());
-		add(scaleYSlider, "cell 1 3");
+		add(scaleYSlider, "cell 1 5");
 
 		//---- rotateLabel ----
 		rotateLabel.setText("Rotate:");
-		add(rotateLabel, "cell 0 4");
+		add(rotateLabel, "cell 0 6");
 
 		//---- rotateSlider ----
 		rotateSlider.setMaximum(360);
@@ -207,7 +245,7 @@ public class FlatPaintingHiDPITest
 		rotateSlider.setPaintLabels(true);
 		rotateSlider.setPaintTicks(true);
 		rotateSlider.addChangeListener(e -> sliderChanged());
-		add(rotateSlider, "cell 1 4");
+		add(rotateSlider, "cell 1 6");
 
 		//======== panel1 ========
 		{
@@ -298,17 +336,19 @@ public class FlatPaintingHiDPITest
 			cRotationDegreesLabel.setText("text");
 			panel1.add(cRotationDegreesLabel, "cell 1 6");
 		}
-		add(panel1, "cell 2 0 1 4");
+		add(panel1, "cell 2 2 1 4,growy");
 
 		//---- resetButton ----
 		resetButton.setText("Reset");
 		resetButton.addActionListener(e -> reset());
-		add(resetButton, "cell 2 4,align left bottom,grow 0 0");
-		add(painter, "cell 0 5 3 1,grow,width 600,height 400");
+		add(resetButton, "cell 2 6,align left bottom,grow 0 0");
+		add(painter, "cell 0 7 3 1,grow,width 600,height 400");
 		// JFormDesigner - End of component initialization  //GEN-END:initComponents
 	}
 
 	// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
+	private JSlider originXSlider;
+	private JSlider originYSlider;
 	private JSlider translateXSlider;
 	private JSlider translateYSlider;
 	private JSlider scaleXSlider;
@@ -331,6 +371,8 @@ public class FlatPaintingHiDPITest
 	public static class HiDPI1xPainter
 		extends JComponent
 	{
+		int originX;
+		int originY;
 		int translateX;
 		int translateY;
 		int scaleX;
@@ -361,10 +403,10 @@ public class FlatPaintingHiDPITest
 				g2.rotate( Math.toRadians( rotate ) );
 
 				g2.setColor( Color.red );
-				g2.fillRect( 0, 0, 100, 50 );
+				g2.fillRect( originX, originY, 100, 50 );
 
 				g2.setColor( Color.green );
-				HiDPIUtils.paintAtScale1x( g2, 0, 0, 100, 50,
+				HiDPIUtils.paintAtScale1x( g2, originX, originY, 100, 50,
 					(g2d, x2, y2, width2, height2, scaleFactor) -> {
 						g2d.fillRect( x2 + 10, y2 + 10, width2 - 20, height2 - 20 );
 					} );

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatPaintingHiDPITest.jfd

@@ -9,36 +9,76 @@ new FormModel {
 		add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 			"$layoutConstraints": "hidemode 3"
 			"$columnConstraints": "[fill][400,fill]para[grow,fill]"
-			"$rowConstraints": "[fill][][][][][grow]"
+			"$rowConstraints": "[][][][][][][][grow]"
 		} ) {
 			name: "this"
 			"border": sfield com.jformdesigner.model.FormObject NULL_VALUE
 			add( new FormComponent( "javax.swing.JLabel" ) {
-				name: "translateXLabel"
-				"text": "TranslateX:"
+				name: "originXLabel"
+				"text": "OriginX:"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 0 0"
 			} )
 			add( new FormComponent( "javax.swing.JSlider" ) {
-				name: "translateXSlider"
+				name: "originXSlider"
+				"maximum": 500
+				"majorTickSpacing": 100
+				"minorTickSpacing": 25
+				"value": 20
+				"paintTicks": true
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "javax.swing.event.ChangeListener", "stateChanged", "sliderChanged", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "originYLabel"
+				"text": "OriginY:"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 1"
+			} )
+			add( new FormComponent( "javax.swing.JSlider" ) {
+				name: "originYSlider"
 				"maximum": 500
 				"paintLabels": true
 				"paintTicks": true
 				"majorTickSpacing": 100
 				"minorTickSpacing": 25
+				"value": 10
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "javax.swing.event.ChangeListener", "stateChanged", "sliderChanged", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 1"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "translateXLabel"
+				"text": "TranslateX:"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 2"
+			} )
+			add( new FormComponent( "javax.swing.JSlider" ) {
+				name: "translateXSlider"
+				"maximum": 500
+				"paintTicks": true
+				"majorTickSpacing": 100
+				"minorTickSpacing": 25
 				"value": 100
 				auxiliary() {
 					"JavaCodeGenerator.variableLocal": false
 				}
 				addEvent( new FormEvent( "javax.swing.event.ChangeListener", "stateChanged", "sliderChanged", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 0"
+				"value": "cell 1 2"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "translateYLabel"
 				"text": "TranslateY:"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 1"
+				"value": "cell 0 3"
 			} )
 			add( new FormComponent( "javax.swing.JSlider" ) {
 				name: "translateYSlider"
@@ -53,20 +93,19 @@ new FormModel {
 				}
 				addEvent( new FormEvent( "javax.swing.event.ChangeListener", "stateChanged", "sliderChanged", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 1"
+				"value": "cell 1 3"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "scaleXLabel"
 				"text": "ScaleX:"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 2"
+				"value": "cell 0 4"
 			} )
 			add( new FormComponent( "javax.swing.JSlider" ) {
 				name: "scaleXSlider"
-				"maximum": 300
+				"maximum": 400
 				"value": 100
 				"paintTicks": true
-				"paintLabels": true
 				"majorTickSpacing": 50
 				"snapToTicks": true
 				"minorTickSpacing": 10
@@ -76,17 +115,17 @@ new FormModel {
 				}
 				addEvent( new FormEvent( "javax.swing.event.ChangeListener", "stateChanged", "sliderChanged", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 2"
+				"value": "cell 1 4"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "scaleYLabel"
 				"text": "ScaleY:"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 3"
+				"value": "cell 0 5"
 			} )
 			add( new FormComponent( "javax.swing.JSlider" ) {
 				name: "scaleYSlider"
-				"maximum": 300
+				"maximum": 400
 				"value": 100
 				"paintTicks": true
 				"paintLabels": true
@@ -99,13 +138,13 @@ new FormModel {
 				}
 				addEvent( new FormEvent( "javax.swing.event.ChangeListener", "stateChanged", "sliderChanged", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 3"
+				"value": "cell 1 5"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "rotateLabel"
 				"text": "Rotate:"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 4"
+				"value": "cell 0 6"
 			} )
 			add( new FormComponent( "javax.swing.JSlider" ) {
 				name: "rotateSlider"
@@ -120,7 +159,7 @@ new FormModel {
 				}
 				addEvent( new FormEvent( "javax.swing.event.ChangeListener", "stateChanged", "sliderChanged", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 4"
+				"value": "cell 1 6"
 			} )
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "hidemode 3"
@@ -264,14 +303,14 @@ new FormModel {
 					"value": "cell 1 6"
 				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 2 0 1 4"
+				"value": "cell 2 2 1 4,growy"
 			} )
 			add( new FormComponent( "javax.swing.JButton" ) {
 				name: "resetButton"
 				"text": "Reset"
 				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "reset", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 2 4,align left bottom,grow 0 0"
+				"value": "cell 2 6,align left bottom,grow 0 0"
 			} )
 			add( new FormComponent( "com.formdev.flatlaf.testing.FlatPaintingHiDPITest$HiDPI1xPainter" ) {
 				name: "painter"
@@ -279,11 +318,11 @@ new FormModel {
 					"JavaCodeGenerator.variableLocal": false
 				}
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 5 3 1,grow,width 600,height 400"
+				"value": "cell 0 7 3 1,grow,width 600,height 400"
 			} )
 		}, new FormLayoutConstraints( null ) {
 			"location": new java.awt.Point( 0, 0 )
-			"size": new java.awt.Dimension( 685, 680 )
+			"size": new java.awt.Dimension( 840, 680 )
 		} )
 	}
 }