FileDocCategorySizeDatePackage
SpotlightPanel.javaAPI DocExample4055Mon Jan 09 11:02:00 GMT 2006None

SpotlightPanel

public class SpotlightPanel extends JComponent implements MouseListener

Fields Summary
protected boolean
blur
protected List
spotlights
protected ConvolveOp
blurOp
protected RenderingHints
hints
Constructors Summary
public SpotlightPanel()

        this(true);
public SpotlightPanel(boolean blur)

        this.blur = blur;
        spotlights = new ArrayList();
        blurOp = new ConvolveOp(getBlurKernel(3), ConvolveOp.EDGE_NO_OP, null);
        hints = new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        hints.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        hints.put(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
Methods Summary
public SpotlightaddSpotlight(int x, int y, int radius)

        return addSpotlight(x, y, radius, radius);
public SpotlightaddSpotlight(int x, int y, int w, int h)

        if (spotlights.size() == 0)
        {
            setVisible(true);
            addMouseListener(this);
        }

        Spotlight spot = new Spotlight(x, y, w, h);
        spotlights.add(spot);
        return spot;
public voidclearSpotlights()

        spotlights.clear();
        setVisible(false);
        removeMouseListener(this);
protected java.awt.image.KernelgetBlurKernel(int blurSize)

        if (blurSize <= 0)
            return null;

        int size = blurSize * blurSize;
        float coeff = 1.0f / size;
        float[] kernelData = new float[size];

        for (int i = 0; i < size; i ++)
            kernelData[i] = coeff;

        return new Kernel(blurSize, blurSize, kernelData);
public voidmouseClicked(java.awt.event.MouseEvent e)

        clearSpotlights();
public voidmouseEntered(java.awt.event.MouseEvent e)
public voidmouseExited(java.awt.event.MouseEvent e)
public voidmousePressed(java.awt.event.MouseEvent e)
public voidmouseReleased(java.awt.event.MouseEvent e)
public voidpaintComponent(java.awt.Graphics g)

        paintSpotlights(g);
protected voidpaintSpotlights(java.awt.Graphics g)

        if (spotlights.size() > 0)
        {
            int width = getWidth();
            int height = getHeight();
    
            double screenArea = width * height;
            double spotsArea = 0.0;

            Rectangle2D screen = new Rectangle2D.Double(0, 0, width, height);
            Area mask = new Area(screen);

            for (int i = 0; i < spotlights.size(); i++)
            {
                Spotlight spot = (Spotlight) spotlights.get(i);
                spotsArea += spot.getArea();
                mask.subtract(new Area(spot.getSpot()));
            }

            Graphics2D g2 = (Graphics2D) g;
            Color shieldColor = new Color(0.0f, 0.0f, 0.0f, 1.0f - (float) (spotsArea / screenArea));

            if (blur)
            {
                BufferedImage buffer = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
                Graphics2D g2buffer = (Graphics2D) buffer.createGraphics();
        
                g2buffer.setRenderingHints(hints);   
                g2buffer.setColor(shieldColor);
                g2buffer.fill(mask);

                g2.drawImage(buffer, blurOp, 0, 0);
            } else {
                g2.setRenderingHints(hints);   
                g2.setColor(shieldColor);
                g2.fill(mask);
            }
        }
public voidremoveSpotlight(Spotlight spot)

        if (spot != null)
        {
            spotlights.remove(spot);
            if (spotlights.size() == 0)
            {
                setVisible(false);
                removeMouseListener(this);
            }
        }