Android Open Source - Android-Charts Slip Band Area Chart

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License

The source code is released under:

Apache License??Version 2.0, January 2004??http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and condi...

Java Source Code

/*
 * SlipBandAreaChart.java//from www. j a v  a 2 s.c o m
 * Android-Charts
 *
 * Created by limc on 2014.
 *
 * Copyright 2011 limc.cn All rights reserved.
 *
 * 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 cn.limc.androidcharts.view;

import java.util.List;

import cn.limc.androidcharts.entity.DateValueEntity;
import cn.limc.androidcharts.entity.LineEntity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;

/**
 * <p>
 * en
 * </p>
 * <p>
 * jp
 * </p>
 * <p>
 * cn
 * </p>
 * 
 * @author limc
 * @version v1.0 2014/01/22 18:03:26
 * 
 */
public class SlipBandAreaChart extends SlipLineChart {

  /**
   * <p>
   * Constructor of SlipBandAreaChart
   * </p>
   * <p>
   * SlipBandChart????????
   * </p>
   * <p>
   * SlipBandChart???????????
   * </p>
   * 
   * @param context
   * @param attrs
   * @param defStyle
   */
  public SlipBandAreaChart(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    // TODO Auto-generated constructor stub
  }

  /**
   * <p>
   * Constructor of SlipBandAreaChart
   * </p>
   * <p>
   * SlipBandChart????????
   * </p>
   * <p>
   * SlipBandChart???????????
   * </p>
   * 
   * @param context
   * @param attrs
   */
  public SlipBandAreaChart(Context context, AttributeSet attrs) {
    super(context, attrs);
    // TODO Auto-generated constructor stub
  }

  /**
   * <p>
   * Constructor of SlipBandAreaChart
   * </p>
   * <p>
   * SlipBandChart????????
   * </p>
   * <p>
   * SlipBandChart???????????
   * </p>
   * 
   * @param context
   */
  public SlipBandAreaChart(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
  }

  /*
   * (non-Javadoc)
   * 
   * <p>Called when is going to draw this chart<p> <p>???????????????????????<p>
   * <p>???????<p>
   * 
   * @param canvas
   * 
   * @see android.view.View#onDraw(android.graphics.Canvas)
   */
  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    // draw lines
    drawAreas(canvas);
  }

  /**
   * <p>
   * draw lines
   * </p>
   * <p>
   * ????????
   * </p>
   * <p>
   * ??????
   * </p>
   * 
   * @param canvas
   */
  protected void drawAreas(Canvas canvas) {
    if (null == linesData) {
      return;
    }
    if (linesData.size() < 2) {
      return;
    }
    LineEntity<DateValueEntity> line1 = (LineEntity<DateValueEntity>) linesData
        .get(0);
    LineEntity<DateValueEntity> line2 = (LineEntity<DateValueEntity>) linesData
        .get(1);
    List<DateValueEntity> line1Data = line1.getLineData();
    List<DateValueEntity> line2Data = line2.getLineData();

    if (line1.isDisplay() == false || line2.isDisplay() == false) {
      return;
    }
    if (line1Data == null || line2Data == null) {
      return;
    }

    Paint mPaint = new Paint();
    mPaint.setColor(line1.getLineColor());
    mPaint.setAlpha(70);
    mPaint.setAntiAlias(true);

    // distance between two points
    float lineLength;
    // start points X
    // set start points X
    float startX;
    
    if (lineAlignType == ALIGN_TYPE_CENTER) {
            lineLength= (dataQuadrant.getQuadrantPaddingWidth() / displayNumber);
            startX = dataQuadrant.getQuadrantPaddingStartX() + lineLength / 2;
        }else {
            lineLength= (dataQuadrant.getQuadrantPaddingWidth() / (displayNumber - 1));
            startX = dataQuadrant.getQuadrantPaddingStartX();
        }
    
    float lastY = 0;
    float lastX = 0;

    Path areaPath = new Path();

    for (int j = displayFrom; j < displayFrom + displayNumber; j++) {
      float value1 = line1Data.get(j).getValue();
      float value2 = line2Data.get(j).getValue();

      // calculate Y
      float valueY1 = (float) ((1f - (value1 - minValue)
          / (maxValue - minValue)) * dataQuadrant.getQuadrantPaddingHeight())
          + dataQuadrant.getQuadrantPaddingStartY();
      float valueY2 = (float) ((1f - (value2 - minValue)
          / (maxValue - minValue)) * dataQuadrant.getQuadrantPaddingHeight())
          + dataQuadrant.getQuadrantPaddingStartY();

      // ????????
      if (j == displayFrom) {
        areaPath.moveTo(startX, valueY1);
        areaPath.lineTo(startX, valueY2);
        areaPath.moveTo(startX, valueY1);
      } else {
        areaPath.lineTo(startX, valueY1);
        areaPath.lineTo(startX, valueY2);
        areaPath.lineTo(lastX, lastY);
        areaPath.close();
        areaPath.moveTo(startX, valueY1);
      }

      lastX = startX;
      lastY = valueY2;
      startX = startX + lineLength;
    }
    areaPath.close();
    canvas.drawPath(areaPath, mPaint);
  }
}

Java Source Code List

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