/* * Copyright 2010, 2011, 2012 mapsforge.org * * This program is free software: you can redistribute it and/or modify it under the * terms of the GNU Lesser General Public License as published by the Free Software * Foundation, either version 3 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT ANY * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License along with * this program. If not, see <http://www.gnu.org/licenses/>. */ package org.mapsforge.android.maps.rendertheme.renderinstruction; import java.io.IOException; import java.util.List; import java.util.Locale; import java.util.regex.Pattern; import org.mapsforge.android.maps.rendertheme.RenderCallback; import org.mapsforge.android.maps.rendertheme.RenderThemeHandler; import org.mapsforge.core.model.Tag; import org.xml.sax.Attributes; import android.graphics.Color; import android.graphics.DashPathEffect; import android.graphics.Paint; import android.graphics.Paint.Cap; import android.graphics.Paint.Style; import android.graphics.Shader; /** * Represents a polyline on the map. */ public final class Line implements RenderInstruction { private static final Pattern SPLIT_PATTERN = Pattern.compile(","); /** * @param elementName * the name of the XML element. * @param attributes * the attributes of the XML element. * @param level * the drawing level of this instruction. * @param relativePathPrefix * the prefix for relative resource paths. * @return a new Line with the given rendering attributes. * @throws IOException * if an I/O error occurs while reading a resource. */ public static Line create(String elementName, Attributes attributes, int level, String relativePathPrefix) throws IOException { String src = null; int stroke = Color.BLACK; float strokeWidth = 0; float[] strokeDasharray = null; Cap strokeLinecap = Cap.ROUND; for (int i = 0; i < attributes.getLength(); ++i) { String name = attributes.getLocalName(i); String value = attributes.getValue(i); if ("src".equals(name)) { src = value; } else if ("stroke".equals(name)) { stroke = Color.parseColor(value); } else if ("stroke-width".equals(name)) { strokeWidth = Float.parseFloat(value); } else if ("stroke-dasharray".equals(name)) { strokeDasharray = parseFloatArray(value); } else if ("stroke-linecap".equals(name)) { strokeLinecap = Cap.valueOf(value.toUpperCase(Locale.ENGLISH)); } else { RenderThemeHandler.logUnknownAttribute(elementName, name, value, i); } } validate(strokeWidth); return new Line(relativePathPrefix, src, stroke, strokeWidth, strokeDasharray, strokeLinecap, level); } private static void validate(float strokeWidth) { if (strokeWidth < 0) { throw new IllegalArgumentException("stroke-width must not be negative: " + strokeWidth); } } static float[] parseFloatArray(String dashString) { String[] dashEntries = SPLIT_PATTERN.split(dashString); float[] dashIntervals = new float[dashEntries.length]; for (int i = 0; i < dashEntries.length; ++i) { dashIntervals[i] = Float.parseFloat(dashEntries[i]); } return dashIntervals; } private final int level; private final Paint paint; private final float strokeWidth; private Line(String relativePathPrefix, String src, int stroke, float strokeWidth, float[] strokeDasharray, Cap strokeLinecap, int level) throws IOException { super(); Shader shader = BitmapUtils.createBitmapShader(relativePathPrefix, src); this.paint = new Paint(Paint.ANTI_ALIAS_FLAG); this.paint.setShader(shader); this.paint.setStyle(Style.STROKE); this.paint.setColor(stroke); if (strokeDasharray != null) { this.paint.setPathEffect(new DashPathEffect(strokeDasharray, 0)); } this.paint.setStrokeCap(strokeLinecap); this.strokeWidth = strokeWidth; this.level = level; } @Override public void destroy() { // do nothing } @Override public void renderNode(RenderCallback renderCallback, List<Tag> tags) { // do nothing } @Override public void renderWay(RenderCallback renderCallback, List<Tag> tags) { renderCallback.renderWay(this.paint, this.level); } @Override public void scaleStrokeWidth(float scaleFactor) { this.paint.setStrokeWidth(this.strokeWidth * scaleFactor); } @Override public void scaleTextSize(float scaleFactor) { // do nothing } }