Drawing an on-screen ornament

This code shows you how to draw something that appears on-screen in a fixed location on the screen. In this example, I have made a line that stays on-screen, from (75, 25) to (100, 100), even if you zoom or pan around. This is the technique you would use, for example, to draw a North arrow.

package com.example;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;

import com.vividsolutions.jump.workbench.ui.LayerViewPanel;
import com.vividsolutions.jump.workbench.ui.renderer.SimpleRenderer;

public class AzimuthRenderer extends SimpleRenderer {
    public final static String CONTENT_ID = "AZIMUTH";
    public AzimuthRenderer(LayerViewPanel panel) {
        super(CONTENT_ID, panel);
    }
    protected void paint(Graphics2D g) throws Exception {
        g.setColor(Color.red);
        g.setStroke(new BasicStroke(4));
        g.drawLine(75, 25, 100, 100);
    }
}

package com.example;

import com.vividsolutions.jump.workbench.ui.TaskFrame;
import com.vividsolutions.jump.workbench.ui.plugin.InstallRendererPlugIn;
import com.vividsolutions.jump.workbench.ui.renderer.Renderer;
/**
 * Ensures that all TaskFrames get a scale bar.
 */
public class InstallAzimuthPlugIn extends InstallRendererPlugIn {
    public InstallAzimuthPlugIn() {
        super(AzimuthRenderer.CONTENT_ID, true);
    }
    protected Renderer.Factory createFactory(final TaskFrame frame) {
        return new Renderer.Factory() {
            public Renderer create() {
                return new AzimuthRenderer(frame.getLayerViewPanel());
            }
        };
    }
}

package com.example;

import com.vividsolutions.jump.workbench.plugin.Extension;
import com.vividsolutions.jump.workbench.plugin.PlugInContext; 

public class AzimuthExtension extends Extension {
    public void configure(PlugInContext context) throws Exception {
        new InstallAzimuthPlugIn().initialize(context);
    }
}