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Added support for labels in pie and doughnut charts
Issue: eclipse#286
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18 changes: 18 additions & 0 deletions
18
org.eclipse.swtchart/src/org/eclipse/swtchart/ICircularSeriesLabel.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| package org.eclipse.swtchart; | ||
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| import java.util.function.Function; | ||
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| import org.eclipse.swtchart.model.Node; | ||
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| public interface ICircularSeriesLabel extends ISeriesLabel { | ||
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| public enum Position { | ||
| Inside, Outside | ||
| } | ||
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| void setPosition(Position position); | ||
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| Position getPosition(); | ||
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| void setLabelProvider(Function<Node, String> labelProvider); | ||
| } |
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127 changes: 127 additions & 0 deletions
127
org.eclipse.swtchart/src/org/eclipse/swtchart/internal/series/CircularSeriesLabel.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| package org.eclipse.swtchart.internal.series; | ||
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| import java.util.function.Function; | ||
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| import org.eclipse.swt.graphics.Font; | ||
| import org.eclipse.swt.graphics.GC; | ||
| import org.eclipse.swt.graphics.Point; | ||
| import org.eclipse.swt.graphics.Rectangle; | ||
| import org.eclipse.swt.graphics.Transform; | ||
| import org.eclipse.swtchart.IAxis; | ||
| import org.eclipse.swtchart.ICircularSeriesLabel; | ||
| import org.eclipse.swtchart.internal.axis.Axis; | ||
| import org.eclipse.swtchart.model.Node; | ||
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| public class CircularSeriesLabel extends SeriesLabel implements ICircularSeriesLabel { | ||
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| private Position position = Position.Inside; | ||
| private Function<Node, String> labelProvider = Node::getId; | ||
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| public CircularSeriesLabel() { | ||
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| } | ||
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| @Override | ||
| public void setPosition(Position position) { | ||
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| this.position = position; | ||
| } | ||
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| @Override | ||
| public Position getPosition() { | ||
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| return position; | ||
| } | ||
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| @Override | ||
| public void setLabelProvider(Function<Node, String> labelProvider) { | ||
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| this.labelProvider = labelProvider; | ||
| } | ||
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| /* package */ void draw(GC gc, Node node, int level, Axis xAxis, Axis yAxis) { | ||
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| if(!isVisible()) | ||
| return; | ||
| switch(position) { | ||
| case Inside: | ||
| drawInside(gc, node, level, xAxis, yAxis); | ||
| break; | ||
| case Outside: | ||
| drawOutside(gc, node, level, xAxis, yAxis); | ||
| break; | ||
| default: | ||
| throw new IllegalArgumentException(); | ||
| } | ||
| } | ||
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| private void drawInside(GC gc, Node node, int level, Axis xAxis, Axis yAxis) { | ||
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| String label = labelProvider.apply(node); | ||
| if(label == null) | ||
| return; | ||
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| Point angleBounds = node.getAngleBounds(); | ||
| // check if pie chart (inner bound) is big enough to draw label | ||
| gc.setFont(getFont()); | ||
| Point textSize = gc.textExtent(label); | ||
| Point start = getPixelCoordinate(xAxis, yAxis, (level - 1), angleBounds.x); | ||
| Point end = getPixelCoordinate(xAxis, yAxis, (level - 1), angleBounds.x + angleBounds.y); | ||
| int size = (int)Math.sqrt(Math.pow((end.x - start.x), 2) + Math.pow((end.y - start.y), 2)); | ||
| if(size < textSize.y - 4) | ||
| return; | ||
| // calculate text angle | ||
| int angle = angleBounds.x + angleBounds.y / 2; | ||
| Point innerBound = getPixelCoordinate(xAxis, yAxis, (level - 1), angle); | ||
| Point outerBound = getPixelCoordinate(xAxis, yAxis, level, angle); | ||
| Transform t = new Transform(gc.getDevice()); | ||
| Point textPosition; | ||
| if(angle >= 90 && angle <= 270) { | ||
| textPosition = outerBound; | ||
| t.translate(textPosition.x, textPosition.y); | ||
| t.rotate((-angle + 180)); | ||
| } else { | ||
| textPosition = innerBound; | ||
| t.translate(textPosition.x, textPosition.y); | ||
| t.rotate(-angle); | ||
| } | ||
| gc.setTransform(t); | ||
| gc.setForeground(getForeground()); | ||
| int length = (int)Math.sqrt(Math.pow((outerBound.x - innerBound.x), 2) + Math.pow((outerBound.y - innerBound.y), 2)); | ||
| gc.setClipping(0, 0 - (textSize.y / 2), length - 3, textSize.y); | ||
| gc.drawString(label, 2, 0 - (textSize.y / 2), true); | ||
| gc.setClipping((Rectangle)null); | ||
| gc.setTransform(null); | ||
| } | ||
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| private void drawOutside(GC gc, Node node, int level, Axis xAxis, Axis yAxis) { | ||
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| String label = labelProvider.apply(node); | ||
| if(label == null) | ||
| return; | ||
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| Point angleBounds = node.getAngleBounds(); | ||
| int angle = angleBounds.x + angleBounds.y / 2; | ||
| Point textSize = gc.textExtent(label); | ||
| // some heuristic to check if there is enough space to render a | ||
| // label | ||
| Point start = getPixelCoordinate(xAxis, yAxis, (level - 1), angleBounds.x); | ||
| Point end = getPixelCoordinate(xAxis, yAxis, (level - 1), angleBounds.x + angleBounds.y); | ||
| if(Math.abs(start.y - end.y) < 4) | ||
| return; | ||
| Point point = getPixelCoordinate(xAxis, yAxis, level * 1.03, angle); | ||
| int x = angle >= 90 && angle <= 270 ? point.x - textSize.x : point.x; | ||
| Font oldFont = gc.getFont(); | ||
| gc.setForeground(getForeground()); | ||
| gc.setFont(getFont()); | ||
| gc.drawString(label, x, point.y - (textSize.y / 2), true); | ||
| gc.setFont(oldFont); | ||
| } | ||
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| protected final Point getPixelCoordinate(IAxis xAxis, IAxis yAxis, double pieLevel, int angle) { | ||
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| double xCoordinate = pieLevel * Math.cos(Math.toRadians(angle)); | ||
| double yCoordinate = pieLevel * Math.sin(Math.toRadians(angle)); | ||
| return new Point(xAxis.getPixelCoordinate(xCoordinate), yAxis.getPixelCoordinate(yCoordinate)); | ||
| } | ||
| } |
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