imagemap.java

This Source-Navigator, an IDE for C/C++/Fortran/Java/Tcl/PHP/Python and a host of other languages.

     * The graphical highlight is achieved using the ButtonFilter.
     */
    public void highlight(Graphics g, boolean on) {
	if (on) {
	    setHighlight(pressed ? downImage : upImage);
	}
	super.highlight(g, on);
	showStatus((on && anchor != null)
		   ? "Go To " + anchor.toExternalForm()
		   : null);
    }

    /**
     * Since the highlight changes when the button is pressed, we need
     * to record the "pressed" state and induce a repaint.
     */
    public void press() {
	parent.repaint();
	pressed = true;
    }

    /**
     * The new URL is fetched when the user releases the mouse button
     * only if they are still in the area.
     */
    public void lift(int x, int y) {
	pressed = false;
	parent.repaint();
	if (inside(x, y) && anchor != null) {
	    showDocument(anchor);
	}
    }
}

/**
 * An improved, round, "Fetch a URL" ImageArea class.
 * This class extends the HrefButtonArea Class to make the 3D button
 * a rounded ellipse.  All of the same feedback and operational
 * charactistics as the HrefButtonArea apply.
 *
 * @author 	Jim Graham
 * @version 	%I%, %G%
 */
class RoundHrefButtonArea extends HrefButtonArea {
    public void makeImages() {
	upImage = parent.getHighlight(X, Y, W, H,
				      new RoundButtonFilter(false,
							    parent.hlpercent,
							    border, W, H));
	downImage = parent.getHighlight(X, Y, W, H,
					new RoundButtonFilter(true,
							      parent.hlpercent,
							      border, W, H));
    }
}

class HighlightFilter extends RGBImageFilter {
    boolean brighter;
    int percent;

    public HighlightFilter(boolean b, int p) {
	brighter = b;
	percent = p;
	canFilterIndexColorModel = true;
    }

    public int filterRGB(int x, int y, int rgb) {
	int r = (rgb >> 16) & 0xff;
	int g = (rgb >> 8) & 0xff;
	int b = (rgb >> 0) & 0xff;
	if (brighter) {
	    r = (255 - ((255 - r) * (100 - percent) / 100));
	    g = (255 - ((255 - g) * (100 - percent) / 100));
	    b = (255 - ((255 - b) * (100 - percent) / 100));
	} else {
	    r = (r * (100 - percent) / 100);
	    g = (g * (100 - percent) / 100);
	    b = (b * (100 - percent) / 100);
	}
	if (r < 0) r = 0;
	if (r > 255) r = 255;
	if (g < 0) g = 0;
	if (g > 255) g = 255;
	if (b < 0) b = 0;
	if (b > 255) b = 255;
	return (rgb & 0xff000000) | (r << 16) | (g << 8) | (b << 0);
    }
}

class ButtonFilter extends RGBImageFilter {
    boolean pressed;
    int defpercent;
    int border;
    int width;
    int height;

    ColorModel models[] = new ColorModel[7];
    ColorModel origbuttonmodel;

    public ButtonFilter(boolean press, int p, int b, int w, int h) {
	pressed = press;
	defpercent = p;
	border = b;
	width = w;
	height = h;
    }

    public void setHints(int hints) {
	super.setHints(hints & (~ImageConsumer.COMPLETESCANLINES));
    }

    public void setColorModel(ColorModel model) {
	if (model instanceof IndexColorModel && true) {
	    IndexColorModel icm = (IndexColorModel) model;
	    models[0] = filterIndexColorModel(icm, false, false, 0);
	    models[1] = filterIndexColorModel(icm, true, !pressed, defpercent);
	    models[2] = null;
	    if (pressed) {
		models[3] = filterIndexColorModel(icm, true, false,
						  defpercent/2);
	    } else {
		models[3] = models[0];
	    }
	    models[4] = null;
	    models[5] = filterIndexColorModel(icm, true, pressed, defpercent);
	    models[6] = models[0];
	    origbuttonmodel = model;
	    consumer.setColorModel(models[3]);
	} else {
	    super.setColorModel(model);
	}
    }

    public IndexColorModel filterIndexColorModel(IndexColorModel icm,
						 boolean opaque,
						 boolean brighter,
						 int percent) {
	byte r[] = new byte[256];
	byte g[] = new byte[256];
	byte b[] = new byte[256];
	byte a[] = new byte[256];
	int mapsize = icm.getMapSize();
	icm.getReds(r);
	icm.getGreens(g);
	icm.getBlues(b);
	if (opaque) {
	    icm.getAlphas(a);
	    for (int i = 0; i < mapsize; i++) {
		int rgb = filterRGB(icm.getRGB(i), brighter, percent);
		a[i] = (byte) (rgb >> 24);
		r[i] = (byte) (rgb >> 16);
		g[i] = (byte) (rgb >> 8);
		b[i] = (byte) (rgb >> 0);
	    }
	}
	return new IndexColorModel(icm.getPixelSize(), mapsize, r, g, b, a);
    }

    /**
     * Define the ranges of varying highlight for the button.
     * ranges is an array of 8 values which split up a scanline into
     * 7 different regions of highlighting effect:
     *
     * ranges[0-1] = area outside of left edge of button
     * ranges[1-2] = area inside UpperLeft highlight region left of center
     * ranges[2-3] = area requiring custom highlighting left of center
     * ranges[3-4] = area inside center of button
     * ranges[4-5] = area requiring custom highlighting right of center
     * ranges[5-6] = area inside LowerRight highlight region right of center
     * ranges[6-7] = area outside of right edge of button
     *
     * Note that ranges[0-1] and ranges[6-7] are empty where the edges of
     * the button touch the left and right edges of the image (everywhere
     * on a square button) and ranges[2-3] and ranges[4-5] are only nonempty
     * in those regions where the UpperLeft highlighting has leaked over
     * the "top" of the button onto parts of its right edge or where the
     * LowerRight highlighting has leaked under the "bottom" of the button
     * onto parts of its left edge (can't happen on square buttons, happens
     * occasionally on round buttons).
     */
    public void buttonRanges(int y, int ranges[]) {
	ranges[0] = ranges[1] = 0;
	if (y < border) {
	    ranges[2] = ranges[3] = ranges[4] = ranges[5] = width - y;
	} else if (y > height - border) {
	    ranges[2] = ranges[3] = ranges[4] = ranges[5] = height - y;
	} else {
	    ranges[2] = ranges[3] = border;
	    ranges[4] = ranges[5] = width - border;
	}
	ranges[6] = ranges[7] = width;
    }

    public void setPixels(int x, int y, int w, int h,
			  ColorModel model, byte pixels[], int off,
			  int scansize) {
	if (model == origbuttonmodel) {
	    int ranges[] = new int[8];
	    int x2 = x + w;
	    for (int cy = y; cy < y + h; cy++) {
		buttonRanges(cy, ranges);
		for (int i = 0; i < 7; i++) {
		    if (x2 > ranges[i] && x < ranges[i+1]) {
			int cx1 = Math.max(x, ranges[i]);
			int cx2 = Math.min(x2, ranges[i+1]);
			if (models[i] == null) {
			    super.setPixels(cx1, cy, cx2 - cx1, 1,
					    model, pixels,
					    off + (cx1 - x), scansize);
			} else {
			    if (cx1 < cx2) {
				consumer.setPixels(cx1, cy, cx2 - cx1, 1,
						   models[i], pixels,
						   off + (cx1 - x), scansize);
			    }
			}
		    }
		}
		off += scansize;
	    }
	} else {
	    super.setPixels(x, y, w, h, model, pixels, off, scansize);
	}
    }

    public int filterRGB(int x, int y, int rgb) {
	boolean brighter;
	int percent;
	if ((x < border && y < height - x) || (y < border && x < width - y)) {
	    brighter = !pressed;
	    percent = defpercent;
	} else if (x >= width - border || y >= height - border) {
	    brighter = pressed;
	    percent = defpercent;
	} else if (pressed) {
	    brighter = false;
	    percent = defpercent / 2;
	} else {
	    return rgb & 0x00ffffff;
	}
	return filterRGB(rgb, brighter, percent);
    }

    public int filterRGB(int rgb, boolean brighter, int percent) {
	int r = (rgb >> 16) & 0xff;
	int g = (rgb >> 8) & 0xff;
	int b = (rgb >> 0) & 0xff;
	if (brighter) {
	    r = (255 - ((255 - r) * (100 - percent) / 100));
	    g = (255 - ((255 - g) * (100 - percent) / 100));
	    b = (255 - ((255 - b) * (100 - percent) / 100));
	} else {
	    r = (r * (100 - percent) / 100);
	    g = (g * (100 - percent) / 100);
	    b = (b * (100 - percent) / 100);
	}
	if (r < 0) r = 0;
	if (g < 0) g = 0;
	if (b < 0) b = 0;
	if (r > 255) r = 255;
	if (g > 255) g = 255;
	if (b > 255) b = 255;
	return (rgb & 0xff000000) | (r << 16) | (g << 8) | (b << 0);
    }
}

class RoundButtonFilter extends ButtonFilter {
    int Xcenter;
    int Ycenter;
    int Yradsq;
    int innerW;
    int innerH;
    int Yrad2sq;

    public RoundButtonFilter(boolean press, int p, int b, int w, int h) {
	super(press, p, b, w, h);
	Xcenter = w/2;
	Ycenter = h/2;
	Yradsq = h * h / 4;
	innerW = w - border * 2;
	innerH = h - border * 2;
	Yrad2sq = innerH * innerH / 4;
    }

    public void buttonRanges(int y, int ranges[]) {
	int yrel = Math.abs(Ycenter - y);
	int xrel = (int) (Math.sqrt(Yradsq - yrel * yrel) * width / height);
	int xslash = width - (y * width / height);
	ranges[0] = 0;
	ranges[1] = Xcenter - xrel;
	ranges[6] = Xcenter + xrel;
	ranges[7] = width;
	if (y < border) {
	    ranges[2] = ranges[3] = ranges[4] = Xcenter;
	    ranges[5] = ranges[6];
	} else if (y + border >= height) {
	    ranges[2] = ranges[1];
	    ranges[3] = ranges[4] = ranges[5] = Xcenter;
	} else {
	    int xrel2 = (int) (Math.sqrt(Yrad2sq - yrel * yrel)
			       * innerW / innerH);
	    ranges[3] = Xcenter - xrel2;
	    ranges[4] = Xcenter + xrel2;
	    if (y < Ycenter) {
		ranges[2] = ranges[3];
		ranges[5] = ranges[6];
	    } else {
		ranges[2] = ranges[1];
		ranges[5] = ranges[4];
	    }
	}
    }

    private int savedranges[];
    private int savedy;

    private synchronized int[] getRanges(int y) {
	if (savedranges == null || savedy != y) {
	    if (savedranges == null) {
		savedranges = new int[8];
	    }
	    buttonRanges(y, savedranges);
	    savedy = y;
	}
	return savedranges;
    }

    public int filterRGB(int x, int y, int rgb) {
	boolean brighter;
	int percent;
	int i;
	int ranges[] = getRanges(y);
	for (i = 0; i < 7; i++) {
	    if (x >= ranges[i] && x < ranges[i+1]) {
		break;
	    }
	}
	double angle;
	switch (i) {
	default:
	case 0:
	case 6:
	    return rgb & 0x00ffffff;
	case 1:
	    brighter = !pressed;
	    percent = defpercent;
	    break;
	case 5:
	    brighter = pressed;
	    percent = defpercent;
	    break;
	case 2:
	    angle = Math.atan2(y - Ycenter, Xcenter - x);
	    percent = defpercent - ((int) (Math.cos(angle) * 2 * defpercent));
	    if (!pressed) {
		percent = -percent;
	    }
	    if (percent == 0) {
		return rgb;
	    } else if (percent < 0) {
		percent = -percent;
		brighter = false;
	    } else {
		brighter = true;
	    }
	    break;
	case 4:
	    angle = Math.atan2(Ycenter - y, x - Xcenter);
	    percent = defpercent - ((int) (Math.cos(angle) * 2 * defpercent));
	    if (pressed) {
		percent = -percent;
	    }
	    if (percent == 0) {
		return rgb;
	    } else if (percent < 0) {
		percent = -percent;
		brighter = false;
	    } else {
		brighter = true;
	    }
	    break;
	case 3:
	    if (!pressed) {
		return rgb & 0x00ffffff;
	    }
	    brighter = false;
	    percent = defpercent;
	    break;
	}
	return filterRGB(rgb, brighter, percent);
    }
}