package com.example.democurvegraph.view;

import java.util.ArrayList;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.view.ViewGroup.LayoutParams;

/**

 * 自定义局部折线图

 * @author feijian

 * @time 2015年6月29日15:37:41

 */

public class CurveView extends View{

    ArrayList<Float> listData;

    int mHeight,mWidth;

    private int default_circle_radius = 4;

    private int selected_circle_radius = 8;

    private int padding = 8;

    private int widthEMS = 0;  //两个相邻描点之间的距离

//    private float avg = 0;// listData里面数组的平均值

    private float maxValue = 0;//最大的值

    private int lineColor=0; //线条的颜色

    private int circleColor=0; //圆圈的颜色

    private float pre_X = 0,pre_Y = 0;

    public CurveView(Context context) {

        super(context);

    }

    public CurveView(Context context, AttributeSet attrs) {

        super(context, attrs);

    }

    public CurveView(Context context, AttributeSet attrs, int defStyleAttr) {

        super(context, attrs, defStyleAttr);

    }

    /**

     * 自定义初始化画图数据

     * @param listData

     * @param lineColor

     * @param circleColor

     */

    public void DrawData(ArrayList<Float> listData,int lineColor,int circleColor)

    {

        this.listData = listData;

        LayoutParams llparam = this.getLayoutParams();

        mHeight = llparam.height;

        mWidth = llparam.width;

        if(listData!=null)

        {

            for(int i=0;i<listData.size();i++)

            {

                if(this.maxValue < listData.get(i))

                {

                    this.maxValue = listData.get(i);

                }

            }

        }

        this.lineColor = lineColor;

        this.circleColor = circleColor;

        this.widthEMS = (mWidth-padding*2)/listData.size();

        System.out.print("widthEMS="+widthEMS+";mWidth="+mWidth+";paddingLeft="+padding+";size="

                +listData.size()+";mHeight="+mHeight);

        invalidate();//刷新界面

    }

    @Override

    protected void onDraw(Canvas canvas) {

        System.out.println("onDraw init");

        if(listData!=null)

        {

            System.out.println("onDraw");

            Paint circlePaint = new Paint();

            circlePaint.setColor(circleColor);

            Paint linePaint = new Paint();

            linePaint.setColor(lineColor);

            for(int i=0;i<listData.size();i++)

            {

                if(pre_X==0 && pre_Y==0)  //说明开始画第一个圈圈

                {

                    pre_X=padding;

                    pre_Y = (mHeight - listData.get(i)*mHeight / maxValue);

                }

                System.out.println("pre_X="+pre_X+";pre_Y="+pre_Y);

                if(i > 0)  //这时需要画前一个线段

                {

                    canvas.drawLine(pre_X, pre_Y, pre_X+widthEMS, mHeight - listData.get(i)*mHeight / maxValue, linePaint);

                    pre_X = pre_X+widthEMS;

                    pre_Y = mHeight - listData.get(i)*mHeight / maxValue;

                }

                canvas.drawCircle(pre_X, pre_Y, default_circle_radius, circlePaint);

            }

        }

        super.onDraw(canvas);

    }

    @Override

    public boolean onTouchEvent(MotionEvent event) {

        // 获取点击屏幕时的点的坐标

        float x = event.getX();

        float y = event.getY();

        System.out.println("x="+x+";y="+y+",event.getAction()"+event.getAction());

        return super.onTouchEvent(event);

    }

}

curveView = (CurveView) findViewById(R.id.v_curve);

        LayoutParams llparams = curveView.getLayoutParams();

        llparams.height = 140;

        llparams.width = 400;

        ArrayList<Float> listData = new ArrayList<Float>();

        listData.add(1f);

        listData.add(2f);

        listData.add(3f);

        listData.add(2f);

        listData.add(5f);

        listData.add(1f);

        listData.add(4f);

        curveView.DrawData(listData,Color.parseColor("#ffffff"),Color.parseColor("#ffffff"));