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/*******************************************************************************
* Copyright (c) 2000, 2013 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.examples.paint;
import org.eclipse.swt.graphics.*;
/**
* 2D Line object
*/
public class SolidPolygonFigure extends Figure {
private Color color;
private int[] points;
/**
* Constructs a SolidPolygon
* These objects are defined by a sequence of vertices.
*
* @param color the color for this object
* @param vertices the array of vertices making up the polygon
* @param numPoint the number of valid points in the array (n >= 3)
*/
public SolidPolygonFigure(Color color, Point[] vertices, int numPoints) {
this.color = color;
this.points = new int[numPoints * 2];
for (int i = 0; i < numPoints; ++i) {
points[i * 2] = vertices[i].x;
points[i * 2 + 1] = vertices[i].y;
}
}
@Override
public void draw(FigureDrawContext fdc) {
int[] drawPoints = new int[points.length];
for (int i = 0; i < points.length; i += 2) {
drawPoints[i] = points[i] * fdc.xScale - fdc.xOffset;
drawPoints[i + 1] = points[i + 1] * fdc.yScale - fdc.yOffset;
}
fdc.gc.setBackground(color);
fdc.gc.fillPolygon(drawPoints);
}
@Override
public void addDamagedRegion(FigureDrawContext fdc, Region region) {
int xmin = Integer.MAX_VALUE, ymin = Integer.MAX_VALUE;
int xmax = Integer.MIN_VALUE, ymax = Integer.MIN_VALUE;
for (int i = 0; i < points.length; i += 2) {
if (points[i] < xmin) xmin = points[i];
if (points[i] > xmax) xmax = points[i];
if (points[i+1] < ymin) ymin = points[i+1];
if (points[i+1] > ymax) ymax = points[i+1];
}
region.add(fdc.toClientRectangle(xmin, ymin, xmax, ymax));
}
}
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