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Add property to automatically set minimal paddings for rounded rectangles #165

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merged 3 commits into from
Jul 18, 2023
Merged

Add property to automatically set minimal paddings for rounded rectangles #165

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c212072
Add property to automatically set minimal paddings for rounded
Eddykasp Jun 23, 2023
c206827
Merge remote-tracking branch 'origin/master' into mka/autopadding
Eddykasp Jul 17, 2023
6ef6809
remove magic numbers and update documentation
Eddykasp Jul 18, 2023
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20 changes: 19 additions & 1 deletion ...klighd/src/de/cau/cs/kieler/klighd/internal/macrolayout/KlighdDiagramLayoutConnector.java
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
import java.util.Map.Entry;
import java.util.Set;

import org.eclipse.elk.core.math.ElkPadding;
import org.eclipse.elk.core.math.KVector;
import org.eclipse.elk.core.options.CoreOptions;
import org.eclipse.elk.core.service.IDiagramLayoutConnector;
Expand Down Expand Up @@ -377,9 +378,26 @@ private void createNode(final LayoutMapping mapping, final KNode node,

// KLighD is somewhat mean and doesn't care about existing insets
node.setInsets(insets);
node.getProperty(CoreOptions.PADDING);
// The Insets are used in {@link KlighdLayoutConfigurationStore} to retrieve the padding
// of the node

if (node.getProperty(KlighdProperties.ROUNDED_RECTANGLE_AUTOPADDING) != null) {
KVector radii = node.getProperty(KlighdProperties.ROUNDED_RECTANGLE_AUTOPADDING);
double padding = 0;
// x and y cannot be zero, if one of the two is zero use the larger value
if (radii.x < 0.00001 && radii.y >= 0.00001) {
radii.x = 0.00001;
} else if (radii.x >= 0.00001 && radii.y < 0.00001) {
radii.y = 0.00001;
}
if (!(radii.x < 0.00001 && radii.y < 0.00001)) {
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// computes a padding x such that the corners of the inner rectangle fit exactly within the rounded rectangle
double numerator = radii.x * radii.y * (-Math.sqrt(2) * Math.sqrt(radii.x * radii.y) + radii.x + radii.y);
double denominator = radii.x * radii.x + radii.y * radii.y;
padding = numerator / denominator;
}
node.setProperty(CoreOptions.PADDING, new ElkPadding(padding));
}

layoutParent.getChildren().add(layoutNode);
mapping.getGraphMap().put(layoutNode, node);
Expand Down
7 changes: 7 additions & 0 deletions plugins/de.cau.cs.kieler.klighd/src/de/cau/cs/kieler/klighd/util/KlighdProperties.java
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Expand Up @@ -375,4 +375,11 @@ public static boolean isSelectable(final EObject viewElement) {
*/
public static final IProperty<Boolean> IS_NODE_TITLE =
new Property<Boolean>("klighd.isNodeTitle", false);

/**
* Automatically computes the padding required to fit the content of a node within the bounds of a
* rounded rectangle. The x and y corner radii are specified as x and y of a KVector.
*/
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public static final IProperty<KVector> ROUNDED_RECTANGLE_AUTOPADDING =
new Property<KVector>("klighd.roundedRectangle.autopadding", null);
}