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The SteelSeries is a javabeans component library that contains gauges. You will find linear and radial gauges. In addition you will also find digital displays, indicators from cars and some instruments from airplanes and sailboats.
/*
* Copyright (c) 2012, Gerrit Grunwald
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* The names of its contributors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package eu.hansolo.steelseries.tools;
import java.awt.Color;
import java.awt.Paint;
import java.awt.PaintContext;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.Transparency;
import java.awt.image.ColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.util.HashMap;
import java.util.Map;
/**
* @author Gerrit Grunwald
*/
public class EllipticGradientPaint implements Paint {
private final Point2D CENTER;
private final Point2D RADIUS_X_Y;
private final float[] FRACTIONS;
private final Color[] COLORS;
private final GradientWrapper COLOR_LOOKUP;
public EllipticGradientPaint(final Point2D GIVEN_CENTER, Point2D GIVEN_RADIUS_X_Y, final float[] GIVEN_FRACTIONS, final Color[] GIVEN_COLORS) {
if (GIVEN_RADIUS_X_Y.distance(0, 0) <= 0) {
throw new IllegalArgumentException("Radius must be greater than 0.");
}
// Check that fractions and colors are of the same size
if (GIVEN_FRACTIONS.length != GIVEN_COLORS.length) {
throw new IllegalArgumentException("Fractions and colors must be equal in size");
}
CENTER = GIVEN_CENTER;
RADIUS_X_Y = GIVEN_RADIUS_X_Y;
FRACTIONS = GIVEN_FRACTIONS.clone();
COLORS = GIVEN_COLORS.clone();
COLOR_LOOKUP = new GradientWrapper(new Point2D.Double(0, 0), new Point2D.Double(100, 0), FRACTIONS, COLORS);
}
@Override
public java.awt.PaintContext createContext(final ColorModel COLOR_MODEL,
final Rectangle DEVICE_BOUNDS,
final Rectangle2D USER_BOUNDS,
final AffineTransform TRANSFORM,
final RenderingHints RENDERING_HINTS) {
final Point2D TRANSFORMED_CENTER = TRANSFORM.transform(CENTER, null);
final Point2D TRANSFORMED_RADIUS_XY = TRANSFORM.deltaTransform(RADIUS_X_Y, null);
return new OvalGradientContext(TRANSFORMED_CENTER, TRANSFORMED_RADIUS_XY, FRACTIONS, COLORS);
}
@Override
public int getTransparency() {
return Transparency.TRANSLUCENT;
}
private final class OvalGradientContext implements PaintContext {
private final Point2D CENTER;
private final Ellipse2D.Double ELLIPSE;
private final Line2D.Double LINE;
private Map lookup;
private double R;
public OvalGradientContext(final Point2D CENTER, final Point2D RADIUS_X_Y, final float[] FRACTIONS, final Color[] COLORS) {
this.CENTER = CENTER;
final double X = CENTER.getX() - RADIUS_X_Y.getX();
final double Y = CENTER.getY() - RADIUS_X_Y.getY();
final double WIDTH = 2 * RADIUS_X_Y.getX();
final double HEIGHT = 2 * RADIUS_X_Y.getY();
ELLIPSE = new Ellipse2D.Double(X, Y, WIDTH, HEIGHT);
LINE = new Line2D.Double();
R = Point2D.distance(0, 0, RADIUS_X_Y.getX(), RADIUS_X_Y.getY());
initLookup();
}
@Override
public void dispose() {
}
@Override
public ColorModel getColorModel() {
return ColorModel.getRGBdefault();
}
@Override
public Raster getRaster(final int X, final int Y, final int TILE_WIDTH, final int TILE_HEIGHT) {
final WritableRaster RASTER = getColorModel().createCompatibleWritableRaster(TILE_WIDTH, TILE_HEIGHT);
int[] data = new int[TILE_WIDTH * TILE_HEIGHT * 4];
double distance;
double dx;
double dy;
double alpha;
double roundDegrees;
double radius;
float ratio;
for (int tileY = 0; tileY < TILE_HEIGHT; tileY++) {
for (int tileX = 0; tileX < TILE_WIDTH; tileX++) {
distance = CENTER.distance(X + tileX, Y + tileY);
dy = Y + tileY - CENTER.getY();
dx = X + tileX - CENTER.getX();
alpha = Math.atan2(dy, dx);
roundDegrees = Math.round(Math.toDegrees(alpha));
radius = lookup.get(roundDegrees);
ratio = (float) (distance / radius);
if (Float.compare(ratio, 1.0f) > 0) {
ratio = 1.0f;
}
final int BASE = (tileY * TILE_WIDTH + tileX) * 4;
data[BASE + 0] = (COLOR_LOOKUP.getColorAt(ratio).getRed());
data[BASE + 1] = (COLOR_LOOKUP.getColorAt(ratio).getGreen());
data[BASE + 2] = (COLOR_LOOKUP.getColorAt(ratio).getBlue());
data[BASE + 3] = (COLOR_LOOKUP.getColorAt(ratio).getAlpha());
}
}
RASTER.setPixels(0, 0, TILE_WIDTH, TILE_HEIGHT, data);
return RASTER;
}
private void initLookup() {
lookup = new HashMap(360);
double alpha;
double xp;
double yp;
for (int angle = -180; angle <= 180; angle++) {
Double key = Double.valueOf(angle);
alpha = Math.toRadians(angle);
xp = CENTER.getX() + R * Math.cos(alpha);
yp = CENTER.getY() + R * Math.sin(alpha);
LINE.setLine(CENTER.getX(), CENTER.getY(), xp, yp);
Double value = Double.valueOf(getRadius());
lookup.put(key, value);
}
lookup.put(0.0, getRadius());
}
private double getRadius() {
final double[] COORDINATES = new double[6];
final Point2D.Double P = new Point2D.Double();
double minDistance = Double.MAX_VALUE;
final double FLATNESS = 0.005;
final java.awt.geom.PathIterator PATH_ITERATOR = ELLIPSE.getPathIterator(null, FLATNESS);
while (!PATH_ITERATOR.isDone()) {
int segment = PATH_ITERATOR.currentSegment(COORDINATES);
switch (segment) {
case java.awt.geom.PathIterator.SEG_CLOSE:
case java.awt.geom.PathIterator.SEG_MOVETO:
case java.awt.geom.PathIterator.SEG_LINETO:
break;
default:
break;
}
final double DISTANCE = LINE.ptSegDist(COORDINATES[0], COORDINATES[1]);
if (DISTANCE < minDistance) {
minDistance = DISTANCE;
P.x = COORDINATES[0];
P.y = COORDINATES[1];
}
PATH_ITERATOR.next();
}
return CENTER.distance(P);
}
}
}
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