Andriod雷达图简单实现

 最近又被毕设指导老师鄙视了一番，说我的方法不适用，表示毕设求过。

实习也快结束了，也没做出什么东西来，感觉很不好。

雷达图效果图

代码：

package com.fr.chart.render;import android.content.Context;import android.graphics.*;import android.view.MotionEvent;import android.view.View;import com.fr.tools.MathTools;import org.json.JSONObject;/** * User: randost * Date: 2014/4/23 * 雷达图 */public class RadarView extends View{    private int count = 6;                //数据个数    private float angle = 360/count;    private int point_radius = 5;         //数据点的半径    private int regionwidth = 30;         //点击选取区域大小    private int valueRulingCount = 5;     //等分值线个数    private int radius;                   //网格最大半径    private int centerX;                  //中心X    private int centerY;                  //中心Y    private String[] titles = {"a","b","c","d","e","f"};    private Point[] pts;                    //维度端点    private Region[] regions;               //打分点区域    private float[] regionValues;           //打分点分数    private Path valuePath;    private double[] data = {8,6,6,6,4,5}; //各维度分值    private float maxValue = 100;             //数据最大值    private Point[] value_pts;              //维度端点    private Paint mainPaint;                //雷达区画笔    private Paint valuePaint;               //数据区画笔    private Paint textPaint;                //文本画笔        //构造函数    public RadarView(Context context, org.mozilla.javascript.Context jsCx, JSONObject options) {        super(context);    }    public RadarView(Context context, double[] data, String[] titles) {        super(context);        setData(data);        setTitles(titles);        init();    }    //初始化    private void init() {        if (data.length == titles.length) {            count = data.length;        }        maxValue = (float) MathTools.roundUp(MathTools.max(data));        mainPaint = new Paint();        mainPaint.setAntiAlias(true);        mainPaint.setColor(Color.GRAY);        mainPaint.setStyle(Paint.Style.FILL_AND_STROKE);        valuePaint = new Paint();        valuePaint.setAntiAlias(true);        valuePaint.setColor(Color.BLUE);        valuePaint.setStyle(Paint.Style.FILL_AND_STROKE);        textPaint = new Paint();        textPaint.setTextSize(20);        textPaint.setStyle(Paint.Style.FILL);        textPaint.setColor(Color.BLACK);        pts = new Point[count];        value_pts = new Point[count];        valuePath = new Path();        for(int i=0; i<count; i++) {            pts[i] = new Point();            value_pts[i] = new Point();        }        regionValues = new float[count*valueRulingCount*2];        regions = new Region[count*valueRulingCount*2];        for(int i=0; i<regions.length; i++) {            regions[i] = new Region();        }    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        radius = Math.min(h, w)/2 - 50;        centerX = w/2;        centerY = h/2;        for(int i=0; i<count; i++)        {            pts[i].x = centerX+(int)(radius*Math.cos(Math.toRadians(angle*i)));            pts[i].y = centerY-(int)(radius*Math.sin(Math.toRadians(angle*i)));           //逆时针-            for(int j=1; j<=valueRulingCount*2; j++)            {                int x = centerX + (pts[i].x-centerX)/(valueRulingCount*2)*j;                int y = centerY + (pts[i].y-centerY)/(valueRulingCount*2)*j;                regions[i*valueRulingCount*2+j-1].set(x-regionwidth/2, y-regionwidth/2, x+regionwidth/2, y+regionwidth/2);                regionValues[i*valueRulingCount*2+j-1] = j * maxValue / valueRulingCount / 2;            }        }        postInvalidate();        super.onSizeChanged(w, h, oldw, oldh);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        int action = event.getAction();        float x = event.getX();        float y = event.getY();        switch(action)        {            case MotionEvent.ACTION_DOWN:                for(int i = 0; i<regions.length; i++)                {                    if (regions[i].contains((int)x, (int)y))                    {                        data[(i/(valueRulingCount*2))] = regionValues[i];                        break;                    }                }                invalidate();                break;            case MotionEvent.ACTION_MOVE:                break;            case MotionEvent.ACTION_UP:                break;        }        return super.onTouchEvent(event);    }    @Override    protected void onDraw(Canvas canvas) {        canvas.drawColor(Color.WHITE);        //绘制雷达网格        for(int i=0; i<count; i++)        {            int end = i+1 == count? 0:i+1;            for(int j=1; j<=valueRulingCount; j++)            {                canvas.drawLine(centerX+(pts[i].x-centerX)*j/valueRulingCount, centerY+(pts[i].y-centerY)*j/valueRulingCount,                        centerX+(pts[end].x-centerX)*j/valueRulingCount, centerY+(pts[end].y-centerY)*j/valueRulingCount, mainPaint);            }            canvas.drawLine(centerX, centerY, pts[i].x, pts[i].y, mainPaint);        }        //绘制四周文本        Paint.FontMetrics fontMetrics = textPaint.getFontMetrics();        float fontHeight = fontMetrics.ascent;        for(int i=0; i<count; i++)        {            if ((angle * i == 90.0) || (angle * i == 270.0))                textPaint.setTextAlign(Paint.Align.CENTER);            else if ((angle * i < 90) || (angle * i > 270))                textPaint.setTextAlign(Paint.Align.LEFT);            else if ((angle * i > 90) || (angle * i < 270))                textPaint.setTextAlign(Paint.Align.RIGHT);            if (angle * i > 225 && angle * i < 315)                canvas.drawText(titles[i], pts[i].x, pts[i].y-fontHeight, textPaint);            else                canvas.drawText(titles[i], pts[i].x, pts[i].y, textPaint);        }        for(int i=0; i<count; i++)        {            value_pts[i].x = (int)(centerX + (pts[i].x-centerX) * data[i]/maxValue);            value_pts[i].y = (int)(centerY + (pts[i].y-centerY) * data[i]/maxValue);        }        //绘制数据图        valuePath.reset();        for(int i = 0; i< pts.length; i++)        {            if (i == 0)                valuePath.moveTo(value_pts[i].x, value_pts[i].y);            else                valuePath.lineTo(value_pts[i].x, value_pts[i].y);            canvas.drawCircle(value_pts[i].x, value_pts[i].y, point_radius, valuePaint);        }        valuePaint.setAlpha(150);        canvas.drawPath(valuePath, valuePaint);    }    public void setTitles(String[] titles) {        this.titles = titles;    }    public void setData(double[] data) {        this.data = data;    }}