Android Open Source - Android-Charts Slip 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

/*
 * SlipAreaChart.java/*from  w w  w . j a va 2s  .co  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 16:19:37
 * 
 */
public class SlipAreaChart extends SlipLineChart {

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

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

  /**
   * <p>
   * Constructor of SlipAreaChart
   * </p>
   * <p>
   * SlipAreaChart????????
   * </p>
   * <p>
   * SlipAreaChart???????????
   * </p>
   * 
   * @param context
   */
  public SlipAreaChart(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;
    }
    // distance between two points
    float lineLength;
    // start points X
    float startX;

    // draw lines
    for (int i = 0; i < linesData.size(); i++) {
      LineEntity<DateValueEntity> line = (LineEntity<DateValueEntity>) linesData
          .get(i);
      if (line == null) {
        continue;
      }
      if (line.isDisplay() == false) {
        continue;
      }
      List<DateValueEntity> lineData = line.getLineData();
      if (lineData == null) {
        continue;
      }

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

      // set start points X
      if (lineAlignType == ALIGN_TYPE_CENTER) {
                lineLength= (dataQuadrant.getQuadrantPaddingWidth() / displayNumber);
                startX = dataQuadrant.getQuadrantPaddingStartX() + lineLength / 2;
            }else {
                lineLength= (dataQuadrant.getQuadrantPaddingWidth() / (displayNumber - 1));
                startX = dataQuadrant.getQuadrantPaddingStartX();
            }
      
      Path linePath = new Path();
      for (int j = displayFrom; j < displayFrom + displayNumber; j++) {
        float value = lineData.get(j).getValue();
        // calculate Y
        float valueY = (float) ((1f - (value - minValue)
            / (maxValue - minValue)) * dataQuadrant.getQuadrantPaddingHeight())
            + dataQuadrant.getQuadrantPaddingStartY();

        // if is not last point connect to previous point
        if (j == displayFrom) {
          linePath.moveTo(startX, dataQuadrant.getQuadrantPaddingEndY());
          linePath.lineTo(startX, valueY);
        } else if (j == displayFrom + displayNumber - 1) {
          linePath.lineTo(startX, valueY);
          linePath.lineTo(startX, dataQuadrant.getQuadrantPaddingEndY());
        } else {
          linePath.lineTo(startX, valueY);
        }
        startX = startX + lineLength;
      }
      linePath.close();
      canvas.drawPath(linePath, mPaint);
    }
  }
}

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