/*******************************************************************************
* Copyright 2009, 2010 Lars Grammel
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
package org.thechiselgroup.choosel.protovis.client;
import static org.thechiselgroup.choosel.protovis.client.PVAlignment.CENTER;
import org.thechiselgroup.choosel.protovis.client.jsutil.JsArgs;
import org.thechiselgroup.choosel.protovis.client.jsutil.JsBooleanFunction;
import org.thechiselgroup.choosel.protovis.client.jsutil.JsDoubleFunction;
import org.thechiselgroup.choosel.protovis.client.jsutil.JsStringFunction;
import org.thechiselgroup.choosel.protovis.client.jsutil.JsUtils;
import com.google.gwt.core.client.JsArrayNumber;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.Widget;
/**
* Protovis/GWT implementation of <a
* href="http://vis.stanford.edu/protovis/ex/pie.html">Protovis pie chart
* example</a>.
*
* @author Lars Grammel
*/
public class PieChartExample extends ProtovisWidget implements ProtovisExample {
@Override
public Widget asWidget() {
return this;
}
private void createVisualization(JsArrayNumber data) {
/* Sizing and scales. */
int w = 400;
int h = 400;
final int r = w / 2;
final PVLinearScale a = PV.Scale.linear(0, PV.sum(data)).range(0,
2 * Math.PI);
/* The root panel. */
PVPanel vis = getPVPanel().width(w).height(h);
/* The wedge, with centered label. */
vis.add(PV.Wedge)
.data(PV.sort(data, PV.reverseOrder()))
.bottom(w / 2)
.left(w / 2)
.innerRadius(r - 40)
.outerRadius(r)
.angle(new JsDoubleFunction() {
public double f(JsArgs args) {
double d = args.getDouble(0);
return a.fd(d);
}
})
.event(PV.Event.MOUSEOVER, new PVEventHandler() {
public void onEvent(Event e, String pvEventType, JsArgs args) {
PVWedge _this = args.getThis();
_this.innerRadius(0);
_this.render();
}
})
.event(PV.Event.MOUSEOUT, new PVEventHandler() {
@Override
public void onEvent(Event e, String pvEventType, JsArgs args) {
PVWedge _this = args.getThis();
_this.innerRadius(r - 40);
_this.render();
}
}).anchor(CENTER).add(PV.Label)
.visible(new JsBooleanFunction() {
public boolean f(JsArgs args) {
double d = args.getDouble(0);
return d > .15;
}
}).textAngle(0).text(new JsStringFunction() {
public String f(JsArgs args) {
double d = args.getDouble(0);
return JsUtils.toFixed(d, 2);
}
});
}
private JsArrayNumber generateData() {
JsArrayNumber data = JsUtils.createJsArrayNumber();
for (int i = 0; i < 10; i++) {
data.push(Math.random());
}
return data;
}
@Override
public String getDescription() {
return null;
}
public String getProtovisExampleURL() {
return "http://vis.stanford.edu/protovis/ex/pie.html";
}
public String getSourceCodeFile() {
return "PieChartExample.java";
}
protected void onAttach() {
super.onAttach();
initPVPanel();
createVisualization(generateData());
getPVPanel().render();
}
public String toString() {
return "Pie/Donut Chart";
}
}