Android Canvas練習(4)自已繪折線圖

弄完柱形圖後，忽然發現，做折線圖變得很容易了。馬上 就弄了張折線圖和折線與柱形圖出來。

效果圖:

主要是利用了Android的Path，這個在這種情況下真很有用。

附上代碼:

package com.xcl.canvas03;

/**
 * Canvas練習 
 * 	  自已畫餅圖和柱形圖，實現出來後覺得也算實用.
 *   折線圖及折線與柱形的混合圖
 * author:xiongchuanliang
 * date:2014-4-6
 */

import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Typeface;
import android.graphics.Path.Direction;
import android.graphics.RectF;
import android.util.DisplayMetrics;
import android.view.Menu;
import android.view.View;

@SuppressLint("NewApi")
public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//setContentView(R.layout.activity_main);
		
		//setContentView(new PanelRpt(this)); //餅圖
		//setContentView(new PanelBar(this)); //柱形圖		
		setContentView(new PanelLnChart(this)); //折線圖
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	
	
class PanelLnChart extends View {
		
		private int ScrHeight;
		private int ScrWidth;
						
		private Paint[] arrPaintArc;
		private Paint PaintText = null;		
		
		final int[] colors = new int[]{			
				R.color.red,
				R.color.white,
				R.color.green,
				R.color.yellow,
				R.color.blue,				
			};
		
		//餅圖演示用的比例,實際使用中，即為外部傳入的比例參數
		final float arrPer[] = new float[]{20f,30f,10f,40f};
		
		//柱形圖演示用的比例,實際使用中，即為外部傳入的比例參數
		private final int[] arrNum = {1,4,3,2};
		
		public PanelLnChart(Context context){
			super(context);
			
			//解決4.1版本 以下canvas.drawTextOnPath()不顯示問題			
			this.setLayerType(View.LAYER_TYPE_SOFTWARE,null);
			
			//屏幕信息
			DisplayMetrics dm = getResources().getDisplayMetrics();
			ScrHeight = dm.heightPixels;
			ScrWidth = dm.widthPixels;
						
			//設置邊緣特殊效果
		    BlurMaskFilter PaintBGBlur = new BlurMaskFilter(
		    						1, BlurMaskFilter.Blur.INNER);

			arrPaintArc = new Paint[5];	
			Resources res = this.getResources();
			for(int i=0;i<5;i++)
			{
				arrPaintArc[i] = new Paint();			
				arrPaintArc[i].setColor(res.getColor(colors[i] )); 
				
				arrPaintArc[i].setStyle(Paint.Style.FILL);
				arrPaintArc[i].setStrokeWidth(4);
				arrPaintArc[i].setMaskFilter(PaintBGBlur);
			}
				
			PaintText = new Paint();
			PaintText.setColor(Color.BLUE);
			PaintText.setTextSize(30);
			PaintText.setTypeface(Typeface.DEFAULT_BOLD);
		}
		
		public void onDraw(Canvas canvas){
			//畫布背景
			canvas.drawColor(Color.WHITE);
					
			//餅圖標題
			canvas.drawText("自繪折線圖", 100,50, PaintText);	
			
			arrPaintArc[0].setTextSize(25);
			arrPaintArc[3].setTextSize(25);			
			arrPaintArc[0].setStyle(Paint.Style.STROKE);
			
			int i= 0;		
			
			int lnWidth = 10; //標識線寬度
			int lnSpace = 40; //標識間距
			
			int startx = 120;
			int endx = startx + 20;
			
			int starty =  ScrHeight / 3 ;
			int endy = ScrHeight / 3 ;
			
			int initX = startx;
			int initY = starty;
			
			int rectHeight = 10; //柱形框高度
			
			/////////////////////////
		    //折線圖
		    ///////////////////////////
			// Y 軸  標識線和值
			int yCount = 5;
			for(i=0; i


 附其它繪制圖表的鏈接:
    Android Canvas練習(1)畫一張報表來玩
   Android Canvas練習(2)自已繪餅圖
   Android Canvas練習(3)自已繪柱形圖






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