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import java.awt.Rectangle; |
import java.awt.Rectangle; |
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import java.awt.geom.AffineTransform; |
import java.awt.geom.AffineTransform; |
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import javax.swing.SwingUtilities; |
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import org.geotools.geometry.jts.ReferencedEnvelope; |
import org.geotools.geometry.jts.ReferencedEnvelope; |
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import org.geotools.renderer.GTRenderer; |
import org.geotools.renderer.GTRenderer; |
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import org.geotools.renderer.RenderListener; |
import org.geotools.renderer.RenderListener; |
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import org.opengis.feature.simple.SimpleFeature; |
import org.opengis.feature.simple.SimpleFeature; |
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public class RenderingExecutor { |
import schmitzm.swing.SwingUtil; |
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/** |
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* This class is used by {@link XMapPane} to start and stop the rendering a |
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* {@link Thread} for rendering. |
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*/ |
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class RenderingExecutor { |
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/** |
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* Instance to a {@link RenderThread} doing any work. It's volatile so the |
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* correct value will always be visible to any {@link Thread} |
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**/ |
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private volatile RenderThread renderThread; |
private volatile RenderThread renderThread; |
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private final XMapPane mapPane; |
private final XMapPane mapPane; |
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public RenderingExecutor(XMapPane mapPane) { |
public RenderingExecutor(XMapPane mapPane) { |
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/** |
/** |
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* Submit a new rendering task. If no rendering task is presently running |
* Submit a new rendering task. If no rendering task is presently running |
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* this new task will be accepted; otherwise it will be rejected (ie. there |
* this new job will be accepted; otherwise it will be rejected and it |
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* is no task queue). |
* returns <code>false</code>. |
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* |
* |
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* @param envelope |
* @param envelope |
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* the map area (world coordinates) to be rendered |
* the map area (world coordinates) to be rendered. |
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* @param graphics |
* @param graphics |
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* the graphics object to draw on |
* the graphics object to draw on. |
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* @param paintArea |
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* size of the area to paint the world into. |
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* @param worldToScreen |
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* the {@link AffineTransform} from world coordinates to screen |
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* coordinates. |
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* @param renderer |
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* the {@link GTRenderer} to use. |
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* |
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* @return true if the rendering task was accepted; false if it was rejected |
* @return true if the rendering task was accepted; false if it was rejected |
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*/ |
*/ |
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public synchronized boolean submit(ReferencedEnvelope envelope, |
public synchronized boolean submit(ReferencedEnvelope envelope, |
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Rectangle paintArea, Graphics2D graphics, |
Rectangle paintArea, Graphics2D graphics, |
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final GTRenderer renderer, AffineTransform worldToScreen) { |
final GTRenderer renderer, AffineTransform worldToScreen) { |
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System.out.println("submit..:"); |
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if (renderThread == null || !renderThread.isAlive()) { |
if (renderThread == null || !renderThread.isAlive()) { |
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System.out.println("is vacant... starting thread!"); |
// System.out.println("is vacant... starting thread!"); |
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renderThread = null; |
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renderThread = new RenderThread(paintArea, graphics, renderer, |
renderThread = new RenderThread(paintArea, graphics, renderer, |
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worldToScreen); |
worldToScreen); |
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return true; |
return true; |
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} else { |
} else { |
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System.out.println("is busy... requesting stop!"); |
// System.out.println("is busy... requesting stop!"); |
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renderThread.getRenderer().stopRendering(); |
renderThread.getRenderer().stopRendering(); |
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return false; |
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} |
} |
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return false; |
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} |
} |
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/** |
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* For every new rendering job submitted and accepted, an instance of this |
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* {@link Thread} will be started. |
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* |
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*/ |
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class RenderThread extends Thread { |
class RenderThread extends Thread { |
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private final GTRenderer renderer; |
private final GTRenderer renderer; |
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super(new RenderRun(paintArea, graphics, renderer, worldToScreen)); |
super(new RenderRun(paintArea, graphics, renderer, worldToScreen)); |
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this.renderer = renderer; |
this.renderer = renderer; |
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System.out.println("starting render thread " + getName()); |
setName("Render" + getName()); |
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// System.out.println("starting render thread " + getName()); |
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} |
} |
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public GTRenderer getRenderer() { |
public GTRenderer getRenderer() { |
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} |
} |
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/** |
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* This {@link Runnable} will actually start the rendering |
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*/ |
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class RenderRun implements Runnable, RenderListener { |
class RenderRun implements Runnable, RenderListener { |
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private final Rectangle paintArea; |
private final Rectangle paintArea; |
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private final Graphics2D graphics; |
private final Graphics2D graphics; |
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try { |
try { |
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renderer.addRenderListener(this); |
renderer.addRenderListener(this); |
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System.out.println("start rendering..."); |
System.out.println("start rendering..."); |
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try { |
// try { |
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Thread.sleep(1000); |
// Thread.sleep(1000); |
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} catch (InterruptedException e) { |
// } catch (InterruptedException e) { |
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// TODO Auto-generated catch block |
// e.printStackTrace(); |
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e.printStackTrace(); |
// } |
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} |
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// Clear the graphics context |
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graphics.setBackground(mapPane.getMapBackgroundColor()); |
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graphics.clearRect(paintArea.x, paintArea.y, paintArea.width, |
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paintArea.height); |
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renderer.paint(graphics, paintArea, worldToScreen); |
renderer.paint(graphics, paintArea, worldToScreen); |
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mapPane.onRenderingCompleted(); |
// Invoked later, so when onRenderingCompleted is called, the Thread is not running anymore (#isRunning = false) |
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SwingUtilities.invokeLater(new Runnable() { |
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@Override |
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public void run() { |
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mapPane.onRenderingCompleted(); |
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}; |
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}); |
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} finally { |
} finally { |
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renderer.removeRenderListener(this); |
renderer.removeRenderListener(this); |
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} |
} |
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} |
} |
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/** |
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* Ask to stop the rendering. May be called often. |
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*/ |
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public void cancelTask() { |
public void cancelTask() { |
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if (renderThread != null && renderThread.isAlive()) { |
if (renderThread != null && renderThread.isAlive()) { |
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// System.out.println("request stop for thread " +task.getName()); |
// System.out.println("request stop for thread " +task.getName()); |
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} |
} |
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} |
} |
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/** |
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* @return <code>true</code> if the {@link Thread} is busy rendering. |
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*/ |
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public boolean isRunning() { |
public boolean isRunning() { |
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// if (task != null) |
// if (task != null) |
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// System.out.println("is running "+task.getName()+" = true"); |
// System.out.println("is running "+task.getName()+" = true"); |
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return (renderThread != null && renderThread.isAlive()); |
return (renderThread != null && renderThread.isAlive()); |
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} |
} |
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/** |
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* Will stop rendering and remove the reference to the {@link Thread}. |
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*/ |
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public void dispose() { |
public void dispose() { |
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if (renderThread != null) { |
if (renderThread != null) { |
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renderThread.renderer.stopRendering(); |
renderThread.renderer.stopRendering(); |