1 /* 2 * Copyright 2012 AndroidPlot.com 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.androidplot.demos; 18 19 import java.text.DecimalFormat; 20 import java.util.Random; 21 22 import android.app.Activity; 23 import android.graphics.Color; 24 import android.graphics.Paint; 25 import android.graphics.PointF; 26 import android.os.Bundle; 27 import android.view.MotionEvent; 28 import android.view.View; 29 import android.view.View.OnTouchListener; 30 import android.widget.Button; 31 32 import com.androidplot.Plot; 33 import com.androidplot.xy.BoundaryMode; 34 import com.androidplot.xy.LineAndPointFormatter; 35 import com.androidplot.xy.SimpleXYSeries; 36 import com.androidplot.xy.XYPlot; 37 38 /*********************************** 39 * @author David Buezas (david.buezas at gmail.com) 40 * Feel free to copy, modify and use the source as it fits you. 41 * 09/27/2012 nfellows - updated for 0.5.1 and made a few simplifications 42 */ 43 public class TouchZoomExampleActivity extends Activity implements OnTouchListener { 44 private static final int SERIES_SIZE = 200; 45 private XYPlot mySimpleXYPlot; 46 private Button resetButton; 47 private SimpleXYSeries[] series = null; 48 private PointF minXY; 49 private PointF maxXY; 50 51 public void onCreate(Bundle savedInstanceState) { 52 super.onCreate(savedInstanceState); 53 setContentView(R.layout.touch_zoom_example); 54 resetButton = (Button) findViewById(R.id.resetButton); 55 resetButton.setOnClickListener(new View.OnClickListener() { 56 @Override 57 public void onClick(View view) { 58 minXY.x = series[0].getX(0).floatValue(); 59 maxXY.x = series[3].getX(series[3].size() - 1).floatValue(); 60 mySimpleXYPlot.setDomainBoundaries(minXY.x, maxXY.x, BoundaryMode.FIXED); 61 62 // pre 0.5.1 users should use postRedraw() instead. 63 mySimpleXYPlot.redraw(); 64 } 65 }); 66 mySimpleXYPlot = (XYPlot) findViewById(R.id.mySimpleXYPlot); 67 mySimpleXYPlot.setOnTouchListener(this); 68 mySimpleXYPlot.getGraphWidget().setTicksPerRangeLabel(2); 69 mySimpleXYPlot.getGraphWidget().setTicksPerDomainLabel(2); 70 mySimpleXYPlot.getGraphWidget().getBackgroundPaint().setColor(Color.TRANSPARENT); 71 mySimpleXYPlot.getGraphWidget().setRangeValueFormat( 72 new DecimalFormat("#####")); 73 mySimpleXYPlot.getGraphWidget().setDomainValueFormat( 74 new DecimalFormat("#####.#")); 75 mySimpleXYPlot.getGraphWidget().setRangeLabelWidth(25); 76 mySimpleXYPlot.setRangeLabel(""); 77 mySimpleXYPlot.setDomainLabel(""); 78 79 mySimpleXYPlot.setBorderStyle(Plot.BorderStyle.NONE, null, null); 80 //mySimpleXYPlot.disableAllMarkup(); 81 series = new SimpleXYSeries[4]; 82 int scale = 1; 83 for (int i = 0; i < 4; i++, scale *= 5) { 84 series[i] = new SimpleXYSeries("S" + i); 85 populateSeries(series[i], scale); 86 } 87 mySimpleXYPlot.addSeries(series[3], 88 new LineAndPointFormatter(Color.rgb(50, 0, 0), null, 89 Color.rgb(100, 0, 0), null)); 90 mySimpleXYPlot.addSeries(series[2], 91 new LineAndPointFormatter(Color.rgb(50, 50, 0), null, 92 Color.rgb(100, 100, 0), null)); 93 mySimpleXYPlot.addSeries(series[1], 94 new LineAndPointFormatter(Color.rgb(0, 50, 0), null, 95 Color.rgb(0, 100, 0), null)); 96 mySimpleXYPlot.addSeries(series[0], 97 new LineAndPointFormatter(Color.rgb(0, 0, 0), null, 98 Color.rgb(0, 0, 150), null)); 99 mySimpleXYPlot.redraw(); 100 mySimpleXYPlot.calculateMinMaxVals(); 101 minXY = new PointF(mySimpleXYPlot.getCalculatedMinX().floatValue(), 102 mySimpleXYPlot.getCalculatedMinY().floatValue()); 103 maxXY = new PointF(mySimpleXYPlot.getCalculatedMaxX().floatValue(), 104 mySimpleXYPlot.getCalculatedMaxY().floatValue()); 105 } 106 107 private void populateSeries(SimpleXYSeries series, int max) { 108 Random r = new Random(); 109 for(int i = 0; i < SERIES_SIZE; i++) { 110 series.addLast(i, r.nextInt(max)); 111 } 112 } 113 114 // Definition of the touch states 115 static final int NONE = 0; 116 static final int ONE_FINGER_DRAG = 1; 117 static final int TWO_FINGERS_DRAG = 2; 118 int mode = NONE; 119 120 PointF firstFinger; 121 float distBetweenFingers; 122 boolean stopThread = false; 123 124 @Override 125 public boolean onTouch(View arg0, MotionEvent event) { 126 switch (event.getAction() & MotionEvent.ACTION_MASK) { 127 case MotionEvent.ACTION_DOWN: // Start gesture 128 firstFinger = new PointF(event.getX(), event.getY()); 129 mode = ONE_FINGER_DRAG; 130 stopThread = true; 131 break; 132 case MotionEvent.ACTION_UP: 133 case MotionEvent.ACTION_POINTER_UP: 134 mode = NONE; 135 break; 136 case MotionEvent.ACTION_POINTER_DOWN: // second finger 137 distBetweenFingers = spacing(event); 138 // the distance check is done to avoid false alarms 139 if (distBetweenFingers > 5f) { 140 mode = TWO_FINGERS_DRAG; 141 } 142 break; 143 case MotionEvent.ACTION_MOVE: 144 if (mode == ONE_FINGER_DRAG) { 145 PointF oldFirstFinger = firstFinger; 146 firstFinger = new PointF(event.getX(), event.getY()); 147 scroll(oldFirstFinger.x - firstFinger.x); 148 mySimpleXYPlot.setDomainBoundaries(minXY.x, maxXY.x, 149 BoundaryMode.FIXED); 150 mySimpleXYPlot.redraw(); 151 152 } else if (mode == TWO_FINGERS_DRAG) { 153 float oldDist = distBetweenFingers; 154 distBetweenFingers = spacing(event); 155 zoom(oldDist / distBetweenFingers); 156 mySimpleXYPlot.setDomainBoundaries(minXY.x, maxXY.x, 157 BoundaryMode.FIXED); 158 mySimpleXYPlot.redraw(); 159 } 160 break; 161 } 162 return true; 163 } 164 165 private void zoom(float scale) { 166 float domainSpan = maxXY.x - minXY.x; 167 float domainMidPoint = maxXY.x - domainSpan / 2.0f; 168 float offset = domainSpan * scale / 2.0f; 169 170 minXY.x = domainMidPoint - offset; 171 maxXY.x = domainMidPoint + offset; 172 173 minXY.x = Math.min(minXY.x, series[3].getX(series[3].size() - 3) 174 .floatValue()); 175 maxXY.x = Math.max(maxXY.x, series[0].getX(1).floatValue()); 176 clampToDomainBounds(domainSpan); 177 } 178 179 private void scroll(float pan) { 180 float domainSpan = maxXY.x - minXY.x; 181 float step = domainSpan / mySimpleXYPlot.getWidth(); 182 float offset = pan * step; 183 minXY.x = minXY.x + offset; 184 maxXY.x = maxXY.x + offset; 185 clampToDomainBounds(domainSpan); 186 } 187 188 private void clampToDomainBounds(float domainSpan) { 189 float leftBoundary = series[0].getX(0).floatValue(); 190 float rightBoundary = series[3].getX(series[3].size() - 1).floatValue(); 191 // enforce left scroll boundary: 192 if (minXY.x < leftBoundary) { 193 minXY.x = leftBoundary; 194 maxXY.x = leftBoundary + domainSpan; 195 } else if (maxXY.x > series[3].getX(series[3].size() - 1).floatValue()) { 196 maxXY.x = rightBoundary; 197 minXY.x = rightBoundary - domainSpan; 198 } 199 } 200 201 private float spacing(MotionEvent event) { 202 float x = event.getX(0) - event.getX(1); 203 float y = event.getY(0) - event.getY(1); 204 return (float) Math.hypot(x, y); 205 } 206 } 207 208
