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package com.android.deskclock;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
/**
* Class to draw a circle for timers and stopwatches.
* These two usages require two different animation modes:
* Timer counts down. In this mode the animation is counter-clockwise and stops at 0.
* Stopwatch counts up. In this mode the animation is clockwise and will run until stopped.
*/
public class CircleTimerView extends View {
private int mAccentColor;
private int mWhiteColor;
private long mIntervalTime = 0;
private long mIntervalStartTime = -1;
private long mMarkerTime = -1;
private long mCurrentIntervalTime = 0;
private long mAccumulatedTime = 0;
private boolean mAnimate = false;
private static float mStrokeSize = 4;
private static float mDotRadius = 6;
private static float mMarkerStrokeSize = 2;
private final Paint mPaint = new Paint();
private final Paint mFill = new Paint();
private final RectF mArcRect = new RectF();
private float mRadiusOffset; // amount to remove from radius to account for markers on circle
private float mScreenDensity;
// Stopwatch mode is the default.
private boolean mTimerMode = false;
@SuppressWarnings("unused")
public CircleTimerView(Context context) {
this(context, null);
}
public CircleTimerView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public void setIntervalTime(long t) {
mIntervalTime = t;
postInvalidate();
}
public void reset() {
mIntervalStartTime = -1;
mMarkerTime = -1;
postInvalidate();
}
public void startIntervalAnimation() {
mIntervalStartTime = Utils.getTimeNow();
mAnimate = true;
invalidate();
}
public void stopIntervalAnimation() {
mAnimate = false;
mIntervalStartTime = -1;
mAccumulatedTime = 0;
}
public boolean isAnimating() {
return (mIntervalStartTime != -1);
}
public void pauseIntervalAnimation() {
mAnimate = false;
mAccumulatedTime += Utils.getTimeNow() - mIntervalStartTime;
}
public void abortIntervalAnimation() {
mAnimate = false;
}
public void setPassedTime(long time, boolean drawRed) {
// The onDraw() method checks if mIntervalStartTime has been set before drawing any red.
// Without drawRed, mIntervalStartTime should not be set here at all, and would remain at -1
// when the state is reconfigured after exiting and re-entering the application.
// If the timer is currently running, this drawRed will not be set, and will have no effect
// because mIntervalStartTime will be set when the thread next runs.
// When the timer is not running, mIntervalStartTime will not be set upon loading the state,
// and no red will be drawn, so drawRed is used to force onDraw() to draw the red portion,
// despite the timer not running.
mCurrentIntervalTime = mAccumulatedTime = time;
if (drawRed) {
mIntervalStartTime = Utils.getTimeNow();
}
postInvalidate();
}
private void init(Context c) {
Resources resources = c.getResources();
mStrokeSize = resources.getDimension(R.dimen.circletimer_circle_size);
float dotDiameter = resources.getDimension(R.dimen.circletimer_dot_size);
mMarkerStrokeSize = resources.getDimension(R.dimen.circletimer_marker_size);
mRadiusOffset = Utils.calculateRadiusOffset(
mStrokeSize, dotDiameter, mMarkerStrokeSize);
mPaint.setAntiAlias(true);
mPaint.setStyle(Paint.Style.STROKE);
mWhiteColor = resources.getColor(R.color.clock_white);
mAccentColor = Utils.obtainStyledColor(c, R.attr.colorAccent, Color.RED);
mScreenDensity = resources.getDisplayMetrics().density;
mFill.setAntiAlias(true);
mFill.setStyle(Paint.Style.FILL);
mFill.setColor(mAccentColor);
mDotRadius = dotDiameter / 2f;
}
public void setTimerMode(boolean mode) {
mTimerMode = mode;
}
@Override
public void onDraw(Canvas canvas) {
int xCenter = getWidth() / 2 + 1;
int yCenter = getHeight() / 2;
mPaint.setStrokeWidth(mStrokeSize);
float radius = Math.min(xCenter, yCenter) - mRadiusOffset;
if (mIntervalStartTime == -1) {
// just draw a complete white circle, no red arc needed
mPaint.setColor(mWhiteColor);
canvas.drawCircle (xCenter, yCenter, radius, mPaint);
if (mTimerMode) {
drawRedDot(canvas, 0f, xCenter, yCenter, radius);
}
} else {
if (mAnimate) {
mCurrentIntervalTime = Utils.getTimeNow() - mIntervalStartTime + mAccumulatedTime;
}
//draw a combination of red and white arcs to create a circle
mArcRect.top = yCenter - radius;
mArcRect.bottom = yCenter + radius;
mArcRect.left = xCenter - radius;
mArcRect.right = xCenter + radius;
float redPercent = (float)mCurrentIntervalTime / (float)mIntervalTime;
// prevent timer from doing more than one full circle
redPercent = (redPercent > 1 && mTimerMode) ? 1 : redPercent;
float whitePercent = 1 - (redPercent > 1 ? 1 : redPercent);
// draw red arc here
mPaint.setColor(mAccentColor);
if (mTimerMode){
canvas.drawArc (mArcRect, 270, - redPercent * 360 , false, mPaint);
} else {
canvas.drawArc (mArcRect, 270, + redPercent * 360 , false, mPaint);
}
// draw white arc here
mPaint.setStrokeWidth(mStrokeSize);
mPaint.setColor(mWhiteColor);
if (mTimerMode) {
canvas.drawArc(mArcRect, 270, + whitePercent * 360, false, mPaint);
} else {
canvas.drawArc(mArcRect, 270 + (1 - whitePercent) * 360,
whitePercent * 360, false, mPaint);
}
if (mMarkerTime != -1 && radius > 0 && mIntervalTime != 0) {
mPaint.setStrokeWidth(mMarkerStrokeSize);
float angle = (float)(mMarkerTime % mIntervalTime) / (float)mIntervalTime * 360;
// draw 2dips thick marker
// the formula to draw the marker 1 unit thick is:
// 180 / (radius * Math.PI)
// after that we have to scale it by the screen density
canvas.drawArc (mArcRect, 270 + angle, mScreenDensity *
(float) (360 / (radius * Math.PI)) , false, mPaint);
}
drawRedDot(canvas, redPercent, xCenter, yCenter, radius);
}
if (mAnimate) {
postInvalidateOnAnimation();
}
}
protected void drawRedDot(
Canvas canvas, float degrees, int xCenter, int yCenter, float radius) {
mPaint.setColor(mAccentColor);
float dotPercent;
if (mTimerMode) {
dotPercent = 270 - degrees * 360;
} else {
dotPercent = 270 + degrees * 360;
}
final double dotRadians = Math.toRadians(dotPercent);
canvas.drawCircle(xCenter + (float) (radius * Math.cos(dotRadians)),
yCenter + (float) (radius * Math.sin(dotRadians)), mDotRadius, mFill);
}
}
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