/**
* Copyright (C) 2009 - 2012 SC 4ViewSoft SRL
*
* 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.achartengine.tools;
import org.achartengine.chart.AbstractChart;
import org.achartengine.chart.RoundChart;
import org.achartengine.chart.XYChart;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.DefaultRenderer;
import org.achartengine.util.MathHelper;
public class FitZoom extends AbstractTool {
/**
* Builds an instance of the fit zoom tool.
*
* @param chart the XY chart
*/
public FitZoom(AbstractChart chart) {
super(chart);
}
/**
* Apply the tool.
*/
public void apply() {
if (mChart instanceof XYChart) {
if (((XYChart) mChart).getDataset() == null) {
return;
}
int scales = mRenderer.getScalesCount();
if (mRenderer.isInitialRangeSet()) {
for (int i = 0; i < scales; i++) {
if (mRenderer.isInitialRangeSet(i)) {
mRenderer.setRange(mRenderer.getInitialRange(i), i);
}
}
} else {
XYSeries[] series = ((XYChart) mChart).getDataset().getSeries();
double[] range = null;
int length = series.length;
if (length > 0) {
for (int i = 0; i < scales; i++) {
range = new double[] { MathHelper.NULL_VALUE, -MathHelper.NULL_VALUE,
MathHelper.NULL_VALUE, -MathHelper.NULL_VALUE };
for (int j = 0; j < length; j++) {
if (i == series[j].getScaleNumber()) {
range[0] = Math.min(range[0], series[j].getMinX());
range[1] = Math.max(range[1], series[j].getMaxX());
range[2] = Math.min(range[2], series[j].getMinY());
range[3] = Math.max(range[3], series[j].getMaxY());
}
}
double marginX = Math.abs(range[1] - range[0]) / 40;
double marginY = Math.abs(range[3] - range[2]) / 40;
mRenderer.setRange(new double[] { range[0] - marginX, range[1] + marginX,
range[2] - marginY, range[3] + marginY }, i);
}
}
}
} else {
DefaultRenderer renderer = ((RoundChart) mChart).getRenderer();
renderer.setScale(renderer.getOriginalScale());
}
}
}