AndroidChart/AndroidCharts/AndroidCharts/src/main/java/im/dacer/androidcharts/ClockPieView.java

package im.dacer.androidcharts;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import java.util.ArrayList;

/**
 * Created by Dacer on 11/13/13.
 */
public class ClockPieView extends View {

    private final int TEXT_COLOR = Color.parseColor("#9B9A9B");
    private final int GRAY_COLOR = Color.parseColor("#D4D3D4");
    private final int RED_COLOR = Color.argb(50, 255, 0, 51);
    private Paint textPaint;
    private Paint redPaint;
    private Paint linePaint;
    private Paint whitePaint;
    private int mViewWidth;
    private int mViewHeight;
    private int textSize;
    private int pieRadius;
    private Point pieCenterPoint;
    private Point tempPoint;
    private Point tempPointRight;
    private int lineLength;
    private float leftTextWidth;
    private float rightTextWidth;
    private float topTextHeight;
    private int lineThickness;
    private RectF cirRect;
    private Rect textRect;
    private ArrayList<ClockPieHelper> pieArrayList = new ArrayList<ClockPieHelper>();
    private Runnable animator = new Runnable() {
        @Override public void run() {
            boolean needNewFrame = false;
            for (ClockPieHelper pie : pieArrayList) {
                pie.update();
                if (!pie.isAtRest()) {
                    needNewFrame = true;
                }
            }
            if (needNewFrame) {
                postDelayed(this, 10);
            }
            invalidate();
        }
    };

    public ClockPieView(Context context) {
        this(context, null);
    }

    public ClockPieView(Context context, AttributeSet attrs) {
        super(context, attrs);
        textSize = MyUtils.sp2px(context, 15);
        lineThickness = MyUtils.dip2px(context, 1);
        lineLength = MyUtils.dip2px(context, 10);

        textPaint = new Paint();
        textPaint.setAntiAlias(true);
        textPaint.setColor(TEXT_COLOR);
        textPaint.setTextSize(textSize);
        textPaint.setTextAlign(Paint.Align.CENTER);
        Paint.FontMetrics fm = new Paint.FontMetrics();
        textPaint.getFontMetrics(fm);
        textRect = new Rect();
        textPaint.getTextBounds("18", 0, 1, textRect);
        redPaint = new Paint(textPaint);
        redPaint.setColor(RED_COLOR);
        linePaint = new Paint(textPaint);
        linePaint.setColor(GRAY_COLOR);
        linePaint.setStrokeWidth(lineThickness);
        whitePaint = new Paint(linePaint);
        whitePaint.setColor(Color.WHITE);
        tempPoint = new Point();
        pieCenterPoint = new Point();
        tempPointRight = new Point();
        cirRect = new RectF();
        leftTextWidth = textPaint.measureText("18");
        rightTextWidth = textPaint.measureText("6");
        topTextHeight = textRect.height();
    }

    public void setDate(ArrayList<ClockPieHelper> helperList) {
        if (helperList != null && !helperList.isEmpty()) {
            int pieSize = pieArrayList.isEmpty() ? 0 : pieArrayList.size();
            for (int i = 0; i < helperList.size(); i++) {
                if (i > pieSize - 1) {
                    //                    float mStart = helperList.get(i).getStart();
                    pieArrayList.add(new ClockPieHelper(0, 0, helperList.get(i)));
                } else {
                    pieArrayList.set(i, pieArrayList.get(i).setTarget(helperList.get(i)));
                }
            }
            int temp = pieArrayList.size() - helperList.size();
            for (int i = 0; i < temp; i++) {
                pieArrayList.remove(pieArrayList.size() - 1);
            }
        } else {
            pieArrayList.clear();
        }

        removeCallbacks(animator);
        post(animator);
    }

    @Override protected void onDraw(Canvas canvas) {
        drawBackground(canvas);
        if (pieArrayList != null) {
            for (ClockPieHelper helper : pieArrayList) {
                canvas.drawArc(cirRect, helper.getStart(), helper.getSweep(), true, redPaint);
            }
        }
    }

    private void drawBackground(Canvas canvas) {
        for (int i = 0; i < 12; i++) {
            tempPoint.set(pieCenterPoint.x - (int) (Math.sin(Math.PI / 12 * i) * (pieRadius
                    + lineLength)), pieCenterPoint.y - (int) (Math.cos(Math.PI / 12 * i) * (
                    pieRadius
                            + lineLength)));
            tempPointRight.set(pieCenterPoint.x + (int) (Math.sin(Math.PI / 12 * i) * (pieRadius
                    + lineLength)), pieCenterPoint.y + (int) (Math.cos(Math.PI / 12 * i) * (
                    pieRadius
                            + lineLength)));
            canvas.drawLine(tempPoint.x, tempPoint.y, tempPointRight.x, tempPointRight.y,
                    linePaint);
        }
        canvas.drawCircle(pieCenterPoint.x, pieCenterPoint.y, pieRadius + lineLength / 2,
                whitePaint);
        canvas.drawCircle(pieCenterPoint.x, pieCenterPoint.y, pieRadius + lineThickness, linePaint);
        canvas.drawCircle(pieCenterPoint.x, pieCenterPoint.y, pieRadius, whitePaint);
        canvas.drawText("0", pieCenterPoint.x, topTextHeight, textPaint);
        canvas.drawText("12", pieCenterPoint.x, mViewHeight, textPaint);
        canvas.drawText("18", leftTextWidth / 2, pieCenterPoint.y + textRect.height() / 2,
                textPaint);
        canvas.drawText("6", mViewWidth - rightTextWidth / 2,
                pieCenterPoint.y + textRect.height() / 2, textPaint);
    }

    @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        mViewWidth = measureWidth(widthMeasureSpec);
        mViewHeight = measureHeight(heightMeasureSpec);
        pieRadius = mViewWidth / 2 - lineLength * 2 - (int) (textPaint.measureText("18") / 2);
        pieCenterPoint.set(mViewWidth / 2 - (int) rightTextWidth / 2 + (int) leftTextWidth / 2,
                mViewHeight / 2 + textSize / 2 - (int) (textPaint.measureText("18") / 2));
        cirRect.set(pieCenterPoint.x - pieRadius, pieCenterPoint.y - pieRadius,
                pieCenterPoint.x + pieRadius, pieCenterPoint.y + pieRadius);
        setMeasuredDimension(mViewWidth, mViewHeight);
    }

    private int measureWidth(int measureSpec) {
        int preferred = 3;
        return getMeasurement(measureSpec, preferred);
    }

    private int measureHeight(int measureSpec) {
        int preferred = mViewWidth;
        return getMeasurement(measureSpec, preferred);
    }

    private int getMeasurement(int measureSpec, int preferred) {
        int specSize = View.MeasureSpec.getSize(measureSpec);
        int measurement;

        switch (View.MeasureSpec.getMode(measureSpec)) {
            case View.MeasureSpec.EXACTLY:
                measurement = specSize;
                break;
            case View.MeasureSpec.AT_MOST:
                measurement = Math.min(preferred, specSize);
                break;
            default:
                measurement = preferred;
                break;
        }
        return measurement;
    }
}