/*
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Copyright 2011 gitblit.com.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package com.gitblit.wicket.charting;
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import java.util.ArrayList;
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import java.util.List;
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import org.apache.wicket.markup.html.IHeaderContributor;
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import org.apache.wicket.markup.html.IHeaderResponse;
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/**
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* The Google Visualization API provides interactive JavaScript based charts and
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* graphs. This class implements the JavaScript header necessary to display
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* complete graphs and charts.
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*
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* @author James Moger
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*
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*/
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public class GoogleCharts implements IHeaderContributor {
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private static final long serialVersionUID = 1L;
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public final List<GoogleChart> charts = new ArrayList<GoogleChart>();
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public void addChart(GoogleChart chart) {
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charts.add(chart);
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}
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@Override
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public void renderHead(IHeaderResponse response) {
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// add Google Chart JS API reference
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response.renderJavascriptReference("https://www.google.com/jsapi");
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// prepare draw chart function
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StringBuilder sb = new StringBuilder();
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line(sb, "google.load(\"visualization\", \"1\", {packages:[\"corechart\"]});");
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line(sb, "google.setOnLoadCallback(drawChart);");
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line(sb, "function drawChart() {");
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// add charts to header
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for (GoogleChart chart : charts) {
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chart.appendChart(sb);
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}
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// end draw chart function
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line(sb, "}");
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response.renderJavascript(sb.toString(), null);
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}
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private void line(StringBuilder sb, String line) {
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sb.append(line);
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sb.append('\n');
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}
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}
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