/*
* 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.util.List;
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.Paint;
import android.graphics.Paint.Style;
/**
* Represents a round area on the map.
*/
public final class Circle implements RenderInstruction {
/**
* @param elementName
* the name of the XML element.
* @param attributes
* the attributes of the XML element.
* @param level
* the drawing level of this instruction.
* @return a new Circle with the given rendering attributes.
*/
public static Circle create(String elementName, Attributes attributes, int level) {
Float radius = null;
boolean scaleRadius = false;
int fill = Color.TRANSPARENT;
int stroke = Color.TRANSPARENT;
float strokeWidth = 0;
for (int i = 0; i < attributes.getLength(); ++i) {
String name = attributes.getLocalName(i);
String value = attributes.getValue(i);
if ("r".equals(name)) {
radius = Float.valueOf(Float.parseFloat(value));
} else if ("scale-radius".equals(name)) {
scaleRadius = Boolean.parseBoolean(value);
} else if ("fill".equals(name)) {
fill = Color.parseColor(value);
} else if ("stroke".equals(name)) {
stroke = Color.parseColor(value);
} else if ("stroke-width".equals(name)) {
strokeWidth = Float.parseFloat(value);
} else {
RenderThemeHandler.logUnknownAttribute(elementName, name, value, i);
}
}
validate(elementName, radius, strokeWidth);
return new Circle(radius, scaleRadius, fill, stroke, strokeWidth, level);
}
private static void validate(String elementName, Float radius, float strokeWidth) {
if (radius == null) {
throw new IllegalArgumentException("missing attribute r for element: " + elementName);
} else if (radius.floatValue() < 0) {
throw new IllegalArgumentException("radius must not be negative: " + radius);
} else if (strokeWidth < 0) {
throw new IllegalArgumentException("stroke-width must not be negative: " + strokeWidth);
}
}
private final Paint fill;
private final int level;
private final Paint outline;
private final float radius;
private float renderRadius;
private final boolean scaleRadius;
private final float strokeWidth;
private Circle(Float radius, boolean scaleRadius, int fill, int stroke, float strokeWidth, int level) {
super();
this.radius = radius.floatValue();
this.scaleRadius = scaleRadius;
if (fill == Color.TRANSPARENT) {
this.fill = null;
} else {
this.fill = new Paint(Paint.ANTI_ALIAS_FLAG);
this.fill.setStyle(Style.FILL);
this.fill.setColor(fill);
}
if (stroke == Color.TRANSPARENT) {
this.outline = null;
} else {
this.outline = new Paint(Paint.ANTI_ALIAS_FLAG);
this.outline.setStyle(Style.STROKE);
this.outline.setColor(stroke);
}
this.strokeWidth = strokeWidth;
this.level = level;
if (!this.scaleRadius) {
this.renderRadius = this.radius;
if (this.outline != null) {
this.outline.setStrokeWidth(this.strokeWidth);
}
}
}
@Override
public void destroy() {
// do nothing
}
@Override
public void renderNode(RenderCallback renderCallback, List<Tag> tags) {
if (this.outline != null) {
renderCallback.renderPointOfInterestCircle(this.renderRadius, this.outline, this.level);
}
if (this.fill != null) {
renderCallback.renderPointOfInterestCircle(this.renderRadius, this.fill, this.level);
}
}
@Override
public void renderWay(RenderCallback renderCallback, List<Tag> tags) {
// do nothing
}
@Override
public void scaleStrokeWidth(float scaleFactor) {
if (this.scaleRadius) {
this.renderRadius = this.radius * scaleFactor;
if (this.outline != null) {
this.outline.setStrokeWidth(this.strokeWidth * scaleFactor);
}
}
}
@Override
public void scaleTextSize(float scaleFactor) {
// do nothing
}
}