root / tags / v2_0_0_Build_2059 / libraries / libFMap_geometries / src / org / gvsig / fmap / geom / impl / DrawGeneralPathXIterator.java @ 39313
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/* gvSIG. Desktop Geographic Information System.
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*
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* Copyright ? 2007-${year} gvSIG Association
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.fmap.geom.impl; |
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import java.awt.geom.AffineTransform; |
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import java.awt.geom.PathIterator; |
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import org.gvsig.fmap.geom.primitive.GeneralPathX; |
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import org.gvsig.fmap.geom.primitive.Point; |
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/**
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* AWT {@link PathIterator} to draw a {@link GeneralPathX} object.
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*
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* While iterating the {@link GeneralPathX) each point coordinates are
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* converted to int. If a segment is a PathIterator#SEG_LINETO and the
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* integer coordinates are the same as the previous point ones, the point
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* is ignored and the next one is looked for.
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*
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* @author gvSIG Team
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*/
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public class DrawGeneralPathXIterator implements PathIterator { |
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protected int typeIdx = -1; |
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protected int pointIdx = 0; |
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protected GeneralPathX path;
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protected AffineTransform affine; |
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/**
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* This array keeps the "real" coordinates (double precision) which
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* will afterwards be rounded to int. It is final and created with
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* its maximum possible size. This does not have a performance cost
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* because only relevant indices are read/written (also when applying
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* an affine transformation)
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*/
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private final double[] currentPointRealCoords = new double[] { 0, 0, 0, 0, 0, 0 }; |
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/**
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* This array keeps the rounded (int) coordinates.
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* It is final and created with
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* its maximum possible size. This does not have a performance cost
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* because only relevant indices are read/written.
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*/
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private final int[] currentPointCoords = new int[] { 0, 0, 0, 0, 0, 0 }; |
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private final int[] previousPointCoords = new int[] { 0, 0 }; |
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private int currentType = -1; |
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private int previousType = -1; |
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private static final int curvesize[] = { 1, 1, 2, 3, 0 }; |
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private final int numTypes; |
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private final int numPoints; |
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/**
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* Constructs an iterator given a GeneralPathX.
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*
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* @see GeneralPathX#getPathIterator
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*/
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public DrawGeneralPathXIterator(GeneralPathX path) {
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this(path, null); |
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} |
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/**
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* Constructs an iterator given a GeneralPathX and an optional
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* AffineTransform.
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*
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* @see GeneralPathX#getPathIterator
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*/
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public DrawGeneralPathXIterator(GeneralPathX path, AffineTransform at) { |
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this.path = path;
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this.affine = at;
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// Go to the first segment
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this.pointIdx = 0; |
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this.numPoints = path.getNumCoords();
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this.typeIdx = 0; |
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this.numTypes = path.getNumTypes();
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if (numTypes > 0) { |
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currentType = path.getTypeAt(typeIdx); |
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readCurrentSegmentCoordsAsInt(); |
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previousType = currentType; |
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previousPointCoords[0] = currentPointCoords[0]; |
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previousPointCoords[1] = currentPointCoords[1]; |
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} |
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} |
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public int getWindingRule() { |
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return path.getWindingRule();
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} |
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public boolean isDone() { |
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return typeIdx >= numTypes;
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} |
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public void next() { |
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do {
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typeIdx++; |
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pointIdx += curvesize[currentType]; |
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if (typeIdx < numTypes) {
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currentType = path.getTypeAt(typeIdx); |
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if (SEG_CLOSE != currentType) {
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readCurrentSegmentCoordsAsInt(); |
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} |
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} else {
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// We have reached past the last segment
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return;
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} |
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} while (isSameSegment());
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previousType = currentType; |
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previousPointCoords[0] = currentPointCoords[0]; |
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previousPointCoords[1] = currentPointCoords[1]; |
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} |
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private final boolean isSameSegment() { |
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return SEG_LINETO == currentType
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&& (SEG_LINETO == previousType || SEG_MOVETO == previousType) |
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&& currentPointCoords[0] == previousPointCoords[0] |
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&& currentPointCoords[1] == previousPointCoords[1]; |
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} |
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private void readCurrentSegmentCoordsAsInt() { |
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int currentSize = curvesize[currentType];
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for (int i = 0; i < currentSize; i++) { |
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readPoint(i * 2, pointIdx + i);
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} |
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if (affine != null && !affine.isIdentity()) { |
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affine.transform(currentPointRealCoords, 0, currentPointRealCoords,
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0, currentSize);
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} |
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for (int i = 0; i < currentSize * 2; i++) { |
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currentPointCoords[i] = (int) currentPointRealCoords[i];
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} |
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} |
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private void readPoint(int currentCoordsPos, int currentPointIdx) { |
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Point point = path.getPointAt(currentPointIdx);
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currentPointRealCoords[currentCoordsPos] = point.getX(); |
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currentPointRealCoords[currentCoordsPos + 1] = point.getY();
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} |
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public int currentSegment(float[] coords) { |
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if (SEG_CLOSE != currentType) {
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int size = curvesize[currentType] * 2; |
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for (int i = 0; i < size; i++) { |
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coords[i] = currentPointCoords[i]; |
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} |
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} |
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return currentType;
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} |
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public int currentSegment(double[] coords) { |
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int size = curvesize[currentType] * 2; |
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for (int i = 0; i < size; i++) { |
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coords[i] = currentPointCoords[i]; |
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} |
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return currentType;
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} |
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} |