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   源码介绍

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Android例子源码SeekCircle圆形进度条(弧形刻度)CircleProgress

package com.caryfish.circleprogress;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;


public class ProgressCircle extends View
{
	private float mRingBias = 0.15f;
	private float mSectionRatio = 5.0f;
	private RectF mSectionRect = new RectF();
	protected float mSectionHeight;
	
	protected float mRadius;
	
	protected int mMaxProgress;
	protected int mProgress;
	
	protected float mCenterX;
	protected float mCenterY;
	
	private Paint mPaint;
	private int mColor1;
	private int mColor2;
	private int mInactiveColor;
	
	
	{
		mMaxProgress = 15;
		mProgress = 0;
		
		mPaint = new Paint();
		mPaint.setAntiAlias(true);
		mPaint.setStyle(Paint.Style.FILL);
		
		mColor1 = Color.parseColor("#ffffd004");
		mColor2 = Color.parseColor("#fffe2601");
		mInactiveColor = Color.parseColor("#ffcccccc");
		
		mPaint.setColor(mColor1); // Set default
	}
	
	public ProgressCircle(Context context, AttributeSet attrs, int defStyle)
	{
		super(context, attrs, defStyle);
		
		initAttributes(context, attrs);
	}
	
	public ProgressCircle(Context context, AttributeSet attrs)
	{
		super(context, attrs);
		
		initAttributes(context, attrs);
	}
	
	public ProgressCircle(Context context)
	{
		super(context);
	}
	
	private void initAttributes(Context context, AttributeSet attrs)
	{
		TypedArray attributes = context.getTheme().obtainStyledAttributes(attrs, R.styleable.SeekCircle, 0, 0);
		try
		{
			// Read and clamp max
			int max = attributes.getInteger(R.styleable.SeekCircle_max, 15);
			mMaxProgress = Math.max(max, 1); 
			
			// Read and clamp progress
			int progress = attributes.getInteger(R.styleable.SeekCircle_progress, 0);
			mProgress = Math.max(Math.min(progress, mMaxProgress), 0); 
		}
		finally
		{
			attributes.recycle();
		}
	}
	
	private void updateDimensions(int width, int height)
	{
		// Update center position
		mCenterX = width / 2.0f;
		mCenterY = height / 2.0f;
		
		// Find shortest dimension
		int diameter = Math.min(width, height);
		
		float outerRadius = diameter / 2;
		float sectionHeight = (float) (1.5 * outerRadius * mRingBias);
		float sectionWidth = (float) (3 * sectionHeight / mSectionRatio);
		
		mRadius = outerRadius - sectionHeight / 2;
		mSectionRect.set(-sectionWidth / 2, -sectionHeight / 2, sectionWidth / 2, sectionHeight / 2);
		mSectionHeight = sectionHeight;
	}
	
	@Override
	protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
	{
		int width = MeasureSpec.getSize(widthMeasureSpec);
		int height = MeasureSpec.getSize(heightMeasureSpec);
		
		if (width > height)
			super.onMeasure(heightMeasureSpec, widthMeasureSpec);
		else
			super.onMeasure(widthMeasureSpec, widthMeasureSpec);
		
		updateDimensions(getWidth(), getHeight());
	}
	
	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh)
	{
		super.onSizeChanged(w, h, oldw, oldh);
		
		updateDimensions(w, h);
	}
	
	@Override
	protected void onDraw(Canvas canvas)
	{
                                    
        float arcLeft = mCenterX - mRadius;    
        float arcTop  = mCenterY - mRadius ;    
        float arcRight = mCenterX   mRadius ;    
        float arcBottom = mCenterY   mRadius ;    
        RectF arcRF0 = new RectF(arcLeft ,arcTop,arcRight,arcBottom);     
          
        //画笔初始化  
        Paint PaintArc = new Paint();     
        PaintArc.setAntiAlias(true);
      //位置计算类    
        XChartCalc xcalc = new XChartCalc();      
          
        float Percentage = 0.0f;  
        float CurrPer = -90.0f;  
        
		for (int i = 0; i < mMaxProgress/2;   i)
		{
			Percentage = (360-mMaxProgress) / mMaxProgress; 
	        if (i < mProgress)
				{
					float bias = (float) i / (float) (mMaxProgress - 1);
					int color = interpolateColor(mColor1, mColor2, bias);
					mPaint.setColor(color);
				}
				else
				{
					canvas.scale(1.0f, 1.0f);
					mPaint.setColor(mInactiveColor);
				}
			canvas.drawArc(arcRF0, CurrPer, Percentage, true, mPaint);
			xcalc.CalcArcEndPointXY(mCenterX, mCenterY, mRadius - mRadius/2/2, CurrPer   Percentage/2); 
			CurrPer =CurrPer   Percentage 1;
		}
		for (int i = mMaxProgress/2; i < mMaxProgress;   i)
		{
			Percentage = (360-mMaxProgress) / mMaxProgress; 
			
	        if (i < mProgress)
				{
					float bias = (float) i / (float) (mMaxProgress - 1);
					int color = interpolateColor(mColor2, mColor1, bias);
					mPaint.setColor(color);
				}
				else
				{
					canvas.scale(1.0f, 1.0f);
					mPaint.setColor(mInactiveColor);
				}
			canvas.drawArc(arcRF0, CurrPer, Percentage, true, mPaint);
			xcalc.CalcArcEndPointXY(mCenterX, mCenterY, mRadius - mRadius/2/2, CurrPer   Percentage/2); 
			CurrPer =CurrPer   Percentage 1;
		}            
        //画圆心  
        PaintArc.setColor(Color.WHITE);  
        canvas.drawCircle(mCenterX,mCenterY,(int)(mRadius/1.5),PaintArc);
		
		super.onDraw(canvas);
	}
	
	private float interpolate(float a, float b, float bias)
	{
		return (a   ((b - a) * bias));
	}

	private int interpolateColor(int colorA, int colorB, float bias)
	{
		float[] hsvColorA = new float[3];
		Color.colorToHSV(colorA, hsvColorA);

		float[] hsvColorB = new float[3];
		Color.colorToHSV(colorB, hsvColorB);

		hsvColorB[0] = interpolate(hsvColorA[0], hsvColorB[0], bias);
		hsvColorB[1] = interpolate(hsvColorA[1], hsvColorB[1], bias);
		hsvColorB[2] = interpolate(hsvColorA[2], hsvColorB[2], bias);
		
		// NOTE For some reason the method HSVToColor fail in edit mode. Just use the start color for now
		if (isInEditMode())
			return colorA;

		return Color.HSVToColor(hsvColorB);
	}
	
	/**
	 * Get max progress
	 * 
	 * @return Max progress
	 */
	public float getMax()
	{
		return mMaxProgress;
	}
	
	/**
	 * Set max progress
	 * 
	 * @param max
	 */
	public void setMax(int max)
	{
		int newMax = Math.max(max, 1);
		if (newMax != mMaxProgress)
			mMaxProgress = newMax;
		
		updateProgress(mProgress);
		invalidate();
	}
	
	/**
	 * Get Progress
	 * 
	 * @return progress
	 */
	public int getProgress()
	{
		return mProgress;
	}
	
	/**
	 * Set progress
	 * 
	 * @param progress
	 */
	public void setProgress(int progress)
	{
		updateProgress(progress);
	}
	
	/**
	 * Update progress internally. Clamp it to a valid range and invalidate the view if necessary 
	 * 
	 * @param progress
	 * @return true if progress was changed and the view needs an update
	 */
	protected boolean updateProgress(int progress)
	{
		// Clamp progress
		progress = Math.max(0, Math.min(mMaxProgress, progress));
		
		if (progress != mProgress)
		{
			mProgress = progress;
			invalidate();
			
			return true;
		}
		
		return false;
	}
}