Android Open Source - Android-Charts Radar 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...
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Java Source Code

/*
 * RadarChart.java/*w w w . j  a v a  2 s.c  om*/
 * Android-Charts
 *
 * Created by limc on 2014/07/29.
 *
 * 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.TitleValueEntity;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PointF;
import android.graphics.Paint.Style;
import android.util.AttributeSet;

/**
 * 
 * <p>
 * RadarChart is a kind of graph that display data on web-like graph. each
 * data was displayed in the longitude lines,like a area graph.
 * </p>
 * <p>
 * RadarChart????????????????????????????????????????????????????????????????
 * </p>
 * <p>
 * RadarChart????????????????????????????????????????????????
 * </p>
 * 
 * @author limc
 * @version v1.0 2011/05/30 14:01:54
 * 
 */
public class RadarChart extends SpiderWebChart {

  /*
   * (non-Javadoc)
   * 
   * @param context
   * 
   * @see cn.limc.androidcharts.view.AbstractBaseChart#BaseChart(Context)
   */
  public RadarChart(Context context) {
    super(context);
  }

  /*
   * (non-Javadoc)
   * 
   * @param context
   * 
   * @param attrs
   * 
   * @param defStyle
   * 
   * @see cn.limc.androidcharts.view.AbstractBaseChart#BaseChart(Context,AttributeSet,
   * int)
   */
  public RadarChart(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }

  /*
   * (non-Javadoc)
   * 
   * @param context
   * 
   * @param attrs
   * 
   * @see cn.limc.androidcharts.view.AbstractBaseChart#BaseChart(Context,
   * AttributeSet)
   */
  public RadarChart(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  /*
   * (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);
  }

  /**
   * <p>
   * draw spider web
   * </p>
   * <p>
   * ????????
   * </p>
   * <p>
   * ?????
   * </p>
   * 
   * @param canvas
   *            Canvas
   */
  protected void drawWeb(Canvas canvas) {
    Paint mPaintWebFill = new Paint();
    mPaintWebFill.setColor(Color.GRAY);
    mPaintWebFill.setAntiAlias(true);

    Paint mPaintWebBorder = new Paint();
    mPaintWebBorder.setColor(Color.WHITE);
    mPaintWebBorder.setStyle(Style.STROKE);
    mPaintWebBorder.setStrokeWidth(2);
    mPaintWebBorder.setAntiAlias(true);

    Paint mPaintWebInnerBorder = new Paint();
    mPaintWebInnerBorder.setColor(Color.LTGRAY);
    mPaintWebInnerBorder.setStyle(Style.STROKE);
    mPaintWebInnerBorder.setAntiAlias(true);

    Paint mPaintLine = new Paint();
    mPaintLine.setColor(Color.LTGRAY);

    Paint mPaintFont = new Paint();
    mPaintFont.setColor(Color.LTGRAY);

    List<PointF> pointList = getWebAxisPoints(1);

    // draw border
    if (null != data) {
      for (int i = 0; i < pointList.size(); i++) {
        PointF pt = pointList.get(i);
        // draw title
        String title = data.get(0).get(i).getTitle();
        float realx = 0;
        float realy = 0;

        // TODO title position
        if (pt.x < position.x) {
          realx = pt.x - mPaintFont.measureText(title) - 5;
        } else if (pt.x > position.x) {
          realx = pt.x + 5;
        } else {
          realx = pt.x - mPaintFont.measureText(title) / 2;
        }

        if (pt.y > position.y) {
          realy = pt.y + 10;
        } else if (pt.y < position.y) {
          realy = pt.y - 2;
        } else {
          realy = pt.y - 5;
        }

        canvas.drawText(title, realx, realy, mPaintFont);
      }
    }
    
    // draw background
    canvas.drawCircle(position.x, position.y, 
                longitudeLength, mPaintWebBorder);
    canvas.drawCircle(position.x, position.y, 
                longitudeLength, mPaintWebFill);

    // draw web
    for (int j = 1; j < latitudeNum; j++) {
        canvas.drawCircle(position.x, position.y, 
                longitudeLength * j / latitudeNum, mPaintWebInnerBorder);
    }

    // draw longitude lines
    for (int i = 0; i < pointList.size(); i++) {
      PointF pt = pointList.get(i);
      canvas.drawLine(position.x, position.y, pt.x, pt.y, mPaintLine);
    }
  }

  /**
   * <p>
   * Draw the data
   * </p>
   * <p>
   * ????????????????
   * </p>
   * <p>
   * ???????????
   * </p>
   * 
   * @param canvas
   */
  protected void drawData(Canvas canvas) {
    if (null != data) {
      for (int j = 0; j < data.size(); j++) {
        List<TitleValueEntity> list = data.get(j);

        Paint mPaintFill = new Paint();
        mPaintFill.setColor(COLORS[j]);
        mPaintFill.setStyle(Style.FILL);
        mPaintFill.setAntiAlias(true);
        mPaintFill.setAlpha(70);

        Paint mPaintBorder = new Paint();
        mPaintBorder.setColor(COLORS[j]);
        mPaintBorder.setStyle(Style.STROKE);
        mPaintBorder.setStrokeWidth(2);
        mPaintBorder.setAntiAlias(true);

        // paint to draw fonts
        Paint mPaintFont = new Paint();
        mPaintFont.setColor(Color.WHITE);

        // paint to draw points
        Paint mPaintPoint = new Paint();
        mPaintPoint.setColor(COLORS[j]);

        Path mPath = new Path();

        // get points to draw
        List<PointF> pointList = getDataPoints(list);
        // initialize path
        for (int i = 0; i < pointList.size(); i++) {
          PointF pt = pointList.get(i);
          if (i == 0) {
            mPath.moveTo(pt.x, pt.y);
          } else {
            mPath.lineTo(pt.x, pt.y);
          }
          canvas.drawCircle(pt.x, pt.y, 3, mPaintPoint);
        }
        mPath.close();

        canvas.drawPath(mPath, mPaintFill);
        canvas.drawPath(mPath, mPaintBorder);
      }
    }
  }
}
Java Source Code List
