报表，折线图

前几天为了实现类window资源管理器的效果实现了这个折线图。

 

效果如下：

 

 

 

使用方法：

     通过renderPoint添加节点。

 

代码如下：

 

package com.hyena.cpumonitor.view;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.util.AttributeSet;
import android.view.View;

/**
 * 折线图
 * @author yangzc
 *
 */
public class LineChartView extends View {

	private int mSpeedX = 4;//速度
	//刻度相关
	private int mScalePos = 0;//刻度面板位置
//	private int mCurYMaxValue = 0;
	private int mScaleCellWidth = 0;
	private Canvas mScaleCanvas = new Canvas();
	private Bitmap mScaleBitmap;
	private Path mScalePath;
	private Paint mScalePaint = new Paint();
	
	//图表相关
	private int mGraphicPos = 0;
	private int mSecoundGraphicPos = 0;
	private Canvas mGraphicCanvas = new Canvas();
	private Bitmap mGraphicBitmap;
	private Paint mGraphicPaint = new Paint();
	private Point mLastPoint = new Point();
	
	private int mWidth = 0;
	private int mHeight = 0;
	
	public LineChartView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	public LineChartView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public LineChartView(Context context) {
		super(context);
	}
	
	/**
	 * 添加采样点
	 * @param value
	 */
	public void renderPoint(int value){
		if(mGraphicPos <= -mWidth){
			mGraphicPos = 0;
			
			Bitmap graphicBm = Bitmap.createBitmap(mGraphicBitmap, mWidth, 0, mWidth, mHeight);
			mGraphicBitmap = Bitmap.createBitmap(mWidth*2, mHeight, Bitmap.Config.ARGB_8888);
			mGraphicCanvas.setBitmap(mGraphicBitmap);
			mGraphicCanvas.drawBitmap(graphicBm, 0, 0, null);
			mLastPoint.x = mWidth;
		}
		float v = mHeight - (value / 100f * mHeight);
		mGraphicCanvas.drawLine(mLastPoint.x, mLastPoint.y, mLastPoint.x + mSpeedX, v, mGraphicPaint);
		mLastPoint = new Point(mLastPoint.x + mSpeedX, (int) v);
		invalidate();
		
		mGraphicPos -= mSpeedX;
		mSecoundGraphicPos -= mSpeedX;
	}
	
	/**
	 * 构筑刻度
	 * @param x
	 * @param y
	 * @param width
	 * @param height
	 * @param maxXValue
	 * @param maxYValue
	 * @return
	 */
	private Path buildScalePath(int x, int y, int width, int height, int maxXValue, int maxYValue) {
		Path path = new Path();
		int rowHeight = Math.round(height / maxYValue)%2 == 0 ? Math.round(height / maxYValue): Math.round(height / maxYValue) + 1;
		int columnWidth = Math.round(width / maxXValue)%2 == 0 ? Math.round(width / maxXValue) : Math.round(width / maxXValue) + 1;
		//画X轴
		for(int i=0; i< maxYValue; i++){
			path.moveTo(x, i * rowHeight);
			path.lineTo(x + width, i * rowHeight);
		}
		//画竖线
		for(int i=0; i< maxXValue; i++){
			path.moveTo(i * columnWidth, y);
			path.lineTo(i * columnWidth, y + height);
		}
		path.close();
		return path;
	}
	
	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		super.onSizeChanged(w, h, oldw, oldh);
		if(w <= 0 || h <= 0)return;
		this.mWidth = w;
		this.mHeight = h;
		//构造刻度内容
		mScaleBitmap = Bitmap.createBitmap(w + 40, h, Bitmap.Config.ARGB_8888);
		mScaleCanvas.setBitmap(mScaleBitmap);
		mScalePaint.setAntiAlias(true);
		mScalePaint.setColor(Color.GREEN);
		mScalePaint.setStrokeWidth(.5f);
		mScalePaint.setStyle(Paint.Style.STROKE);
		mScalePath = buildScalePath(0, 0, mWidth + 40, mHeight, 25, 8);
		mScaleCanvas.drawPath(mScalePath, mScalePaint);
		mScaleCellWidth = (mWidth + 40)/25;
		//单元格宽度务必要可以被2整除
		mScaleCellWidth = mScaleCellWidth%2 == 0 ? mScaleCellWidth : mScaleCellWidth + 1;
		mSpeedX = mScaleCellWidth/2;
		
		//构造图表
		mGraphicBitmap = Bitmap.createBitmap(w*2, h, Bitmap.Config.ARGB_8888);
		mGraphicCanvas.setBitmap(mGraphicBitmap);
		mGraphicPaint.setAntiAlias(true);
		mGraphicPaint.setColor(Color.GREEN);
		mGraphicPaint.setStyle(Paint.Style.STROKE);
		mGraphicPos = mWidth;
		mLastPoint = new Point(10, 0);
		
		if(mLineChartStateChangeListener != null)
			mLineChartStateChangeListener.onSizeChanged(w, h, oldw, oldh);
	}

	@Override
	protected void onDraw(Canvas canvas) {
		int left = mScalePos - mSpeedX;
//		Log.v("yangzc", "Left : " +left + ", mScaleCellWidth: " + mScaleCellWidth);
		if(Math.abs(left) >= mScaleCellWidth)
			left = 0;
		canvas.drawBitmap(mScaleBitmap, left, 0, null);
		mScalePos = left;
		
		//画报表
		canvas.drawBitmap(mGraphicBitmap, mGraphicPos, 0, null);
	}
	
	private LineChartStateChangeListener mLineChartStateChangeListener;
	public void setLineChartStateChangeListener(LineChartStateChangeListener lineChartStateChangeListener){
		this.mLineChartStateChangeListener = lineChartStateChangeListener;
	}
	public static interface LineChartStateChangeListener {
		public void onSizeChanged(int w, int h, int oldw, int oldh);
	}
}

评论

2 楼 yangzc106 2013-05-21  

91上下载【系统监听器】

1 楼 521懒洋洋 2012-12-26  

能不能发一份源码给我啊 我的邮箱是[e-mail] 谢谢