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;
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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.renderer.DefaultRenderer;
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22 import org.achartengine.tools.Pan;
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23 import org.achartengine.tools.PanListener;
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24 import org.achartengine.tools.Zoom;
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25 import org.achartengine.tools.ZoomListener;
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27 import android.graphics.RectF;
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28 import android.view.MotionEvent;
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31 * The main handler of the touch events.
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33 public class TouchHandler implements ITouchHandler {
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34 /** The chart renderer. */
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35 private DefaultRenderer mRenderer;
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36 /** The old x coordinate. */
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38 /** The old y coordinate. */
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40 /** The old x2 coordinate. */
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41 private float oldX2;
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42 /** The old y2 coordinate. */
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43 private float oldY2;
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44 /** The zoom buttons rectangle. */
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45 private RectF zoomR = new RectF();
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46 /** The pan tool. */
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48 /** The zoom for the pinch gesture. */
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49 private Zoom mPinchZoom;
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50 /** The graphical view. */
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51 private GraphicalView graphicalView;
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54 * Creates a new graphical view.
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56 * @param view the graphical view
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57 * @param chart the chart to be drawn
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59 public TouchHandler(GraphicalView view, AbstractChart chart) {
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60 graphicalView = view;
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61 zoomR = graphicalView.getZoomRectangle();
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62 if (chart instanceof XYChart) {
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63 mRenderer = ((XYChart) chart).getRenderer();
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65 mRenderer = ((RoundChart) chart).getRenderer();
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67 if (mRenderer.isPanEnabled()) {
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68 mPan = new Pan(chart);
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70 if (mRenderer.isZoomEnabled()) {
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71 mPinchZoom = new Zoom(chart, true, 1);
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76 * Handles the touch event.
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78 * @param event the touch event
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80 public boolean handleTouch(MotionEvent event) {
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81 int action = event.getAction();
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82 if (mRenderer != null && action == MotionEvent.ACTION_MOVE) {
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83 if (oldX >= 0 || oldY >= 0) {
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84 float newX = event.getX(0);
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85 float newY = event.getY(0);
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86 if (event.getPointerCount() > 1 && (oldX2 >= 0 || oldY2 >= 0) && mRenderer.isZoomEnabled()) {
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87 float newX2 = event.getX(1);
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88 float newY2 = event.getY(1);
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89 float newDeltaX = Math.abs(newX - newX2);
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90 float newDeltaY = Math.abs(newY - newY2);
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91 float oldDeltaX = Math.abs(oldX - oldX2);
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92 float oldDeltaY = Math.abs(oldY - oldY2);
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95 float tan1 = Math.abs(newY - oldY) / Math.abs(newX - oldX);
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96 float tan2 = Math.abs(newY2 - oldY2) / Math.abs(newX2 - oldX2);
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97 if ( tan1 <= 0.577 && tan2 <= 0.577) {
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98 // horizontal pinch zoom, |deltaY| / |deltaX| is [0 ~ 0.577], 0.577 is the approximate value of tan(Pi/6)
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99 zoomRate = newDeltaX / oldDeltaX;
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100 if (zoomRate > 0.909 && zoomRate < 1.1) {
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101 mPinchZoom.setZoomRate(zoomRate);
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102 mPinchZoom.apply(Zoom.ZOOM_AXIS_X);
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104 } else if ( tan1 >= 1.732 && tan2 >= 1.732 ) {
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105 // pinch zoom vertically, |deltaY| / |deltaX| is [1.732 ~ infinity], 1.732 is the approximate value of tan(Pi/3)
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106 zoomRate = newDeltaY / oldDeltaY;
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107 if (zoomRate > 0.909 && zoomRate < 1.1) {
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108 mPinchZoom.setZoomRate(zoomRate);
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109 mPinchZoom.apply(Zoom.ZOOM_AXIS_Y);
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111 } else if ( (tan1 > 0.577 && tan1 < 1.732) && (tan2 > 0.577 && tan2 < 1.732) ){
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112 // pinch zoom diagonally
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113 if (Math.abs(newX - oldX) >= Math.abs(newY - oldY)) {
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114 zoomRate = newDeltaX / oldDeltaX;
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116 zoomRate = newDeltaY / oldDeltaY;
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118 if (zoomRate > 0.909 && zoomRate < 1.1) {
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119 mPinchZoom.setZoomRate(zoomRate);
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120 mPinchZoom.apply(Zoom.ZOOM_AXIS_XY);
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125 } else if (mRenderer.isPanEnabled()) {
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126 mPan.apply(oldX, oldY, newX, newY);
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132 graphicalView.repaint();
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135 } else if (action == MotionEvent.ACTION_DOWN) {
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136 oldX = event.getX(0);
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137 oldY = event.getY(0);
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138 if (mRenderer != null && mRenderer.isZoomEnabled() && zoomR.contains(oldX, oldY)) {
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139 if (oldX < zoomR.left + zoomR.width() / 3) {
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140 graphicalView.zoomIn();
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141 } else if (oldX < zoomR.left + zoomR.width() * 2 / 3) {
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142 graphicalView.zoomOut();
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144 graphicalView.zoomReset();
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148 } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_POINTER_UP) {
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153 if (action == MotionEvent.ACTION_POINTER_UP) {
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158 return !mRenderer.isClickEnabled();
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162 * Adds a new zoom listener.
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164 * @param listener zoom listener
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166 public void addZoomListener(ZoomListener listener) {
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167 if (mPinchZoom != null) {
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168 mPinchZoom.addZoomListener(listener);
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173 * Removes a zoom listener.
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175 * @param listener zoom listener
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177 public void removeZoomListener(ZoomListener listener) {
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178 if (mPinchZoom != null) {
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179 mPinchZoom.removeZoomListener(listener);
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184 * Adds a new pan listener.
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186 * @param listener pan listener
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188 public void addPanListener(PanListener listener) {
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189 if (mPan != null) {
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190 mPan.addPanListener(listener);
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195 * Removes a pan listener.
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197 * @param listener pan listener
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199 public void removePanListener(PanListener listener) {
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200 if (mPan != null) {
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201 mPan.removePanListener(listener);
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