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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.examples.paint;
import java.util.Random;
import org.eclipse.swt.graphics.*;
/**
* An airbrush tool.
*/
public class AirbrushTool extends ContinuousPaintSession implements PaintTool {
private ToolSettings settings;
private Random random;
private int cachedRadiusSquared;
private int cachedNumPoints;
/**
* Constructs a Tool.
*
* @param toolSettings the new tool settings
* @param paintSurface the PaintSurface we will render on.
*/
public AirbrushTool(ToolSettings toolSettings, PaintSurface paintSurface) {
super(paintSurface);
random = new Random();
setRetriggerTimer(10);
set(toolSettings);
}
/**
* Sets the tool's settings.
*
* @param toolSettings the new tool settings
*/
public void set(ToolSettings toolSettings) {
// compute things we need to know for drawing
settings = toolSettings;
cachedRadiusSquared = settings.airbrushRadius * settings.airbrushRadius;
cachedNumPoints = 314 * settings.airbrushIntensity * cachedRadiusSquared / 250000;
if (cachedNumPoints == 0 && settings.airbrushIntensity != 0)
cachedNumPoints = 1;
}
/**
* Returns the name associated with this tool.
*
* @return the localized name of this tool
*/
public String getDisplayName() {
return PaintExample.getResourceString("tool.Airbrush.label");
}
/*
* Template method for drawing
*/
protected void render(Point point) {
// Draws a bunch (cachedNumPoints) of random pixels within a specified circle (cachedRadiusSquared).
ContainerFigure cfig = new ContainerFigure();
for (int i = 0; i < cachedNumPoints; ++i) {
int randX, randY;
do {
randX = (int) ((random.nextDouble() - 0.5) * settings.airbrushRadius * 2.0);
randY = (int) ((random.nextDouble() - 0.5) * settings.airbrushRadius * 2.0);
} while (randX * randX + randY * randY > cachedRadiusSquared);
cfig.add(new PointFigure(settings.commonForegroundColor, point.x + randX, point.y + randY));
}
getPaintSurface().drawFigure(cfig);
}
}
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