2 * Copyright (C) 2009 - 2012 SC 4ViewSoft SRL
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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8 * http://www.apache.org/licenses/LICENSE-2.0
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10 * Unless required by applicable law or agreed to in writing, software
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11 * distributed under the License is distributed on an "AS IS" BASIS,
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12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 * See the License for the specific language governing permissions and
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14 * limitations under the License.
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16 package org.achartengine.tools;
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18 import org.achartengine.chart.AbstractChart;
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19 import org.achartengine.chart.RoundChart;
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20 import org.achartengine.chart.XYChart;
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21 import org.achartengine.model.XYSeries;
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22 import org.achartengine.renderer.DefaultRenderer;
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23 import org.achartengine.util.MathHelper;
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25 public class FitZoom extends AbstractTool {
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27 * Builds an instance of the fit zoom tool.
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29 * @param chart the XY chart
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31 public FitZoom(AbstractChart chart) {
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38 public void apply() {
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39 if (mChart instanceof XYChart) {
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40 if (((XYChart) mChart).getDataset() == null) {
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43 int scales = mRenderer.getScalesCount();
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44 if (mRenderer.isInitialRangeSet()) {
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45 for (int i = 0; i < scales; i++) {
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46 if (mRenderer.isInitialRangeSet(i)) {
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47 mRenderer.setRange(mRenderer.getInitialRange(i), i);
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51 XYSeries[] series = ((XYChart) mChart).getDataset().getSeries();
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52 double[] range = null;
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53 int length = series.length;
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55 for (int i = 0; i < scales; i++) {
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56 range = new double[] { MathHelper.NULL_VALUE, -MathHelper.NULL_VALUE,
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57 MathHelper.NULL_VALUE, -MathHelper.NULL_VALUE };
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58 for (int j = 0; j < length; j++) {
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59 if (i == series[j].getScaleNumber()) {
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60 range[0] = Math.min(range[0], series[j].getMinX());
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61 range[1] = Math.max(range[1], series[j].getMaxX());
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62 range[2] = Math.min(range[2], series[j].getMinY());
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63 range[3] = Math.max(range[3], series[j].getMaxY());
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66 double marginX = Math.abs(range[1] - range[0]) / 40;
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67 double marginY = Math.abs(range[3] - range[2]) / 40;
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68 mRenderer.setRange(new double[] { range[0] - marginX, range[1] + marginX,
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69 range[2] - marginY, range[3] + marginY }, i);
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74 DefaultRenderer renderer = ((RoundChart) mChart).getRenderer();
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75 renderer.setScale(renderer.getOriginalScale());
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