Implement ImageDescriptor.getImageData(int zoom)

gitlab #228

Change-Id: I0b0294a8a48d6d633c452fee780be502f4d58406

bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/gfx/ColorImageDescriptor.java

@@ -36,8 +36,24 @@ public class ColorImageDescriptor extends ImageDescriptor {
 		this.selected = selected;
 	}
 
+	@Override
+	public ImageData getImageData(int zoom) {
+		int w = width;
+		int h = height;
+		if (zoom > 100) {
+			float s = zoom / 100.0f;
+			w = Math.round(width * s);
+			h = Math.round(height * s);
+		}
+		return getImageData(w, h);
+	}
+
 	@Override
 	public ImageData getImageData() {
+		return getImageData(100);
+	}
+
+	private ImageData getImageData(int width, int height) {
 		ImageData id = new ImageData(width, height, 24, PALETTEDATA);
 		int cx = width / 2;
 		int cy = height / 2;

bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/gfx/TextImageDescriptor.java

@@ -53,8 +53,22 @@ public class TextImageDescriptor extends ImageDescriptor {
 	}
 
 	@Override
-	public ImageData getImageData() {
+	public ImageData getImageData(int zoom) {
+		int w = width;
+		int h = height;
+		int fs = fontSize;
+		if (zoom > 100) {
+			float s = zoom / 100.0f;
+			w = Math.round(width * s);
+			h = Math.round(height * s);
+			fs = Math.round(fontSize * s);
+		}
+		return getImageData(w, h, fs);
+	}
+
+	private ImageData getImageData(int width, int height, int fontSize) {
 		ImageData id = new ImageData(width, height, 24, _RGB);
+
 		BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
 		Graphics2D g = (Graphics2D) bi.getGraphics();
 		g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);