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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.camera.ui;
import com.android.camera.R;
import com.android.camera.Util;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
/**
* A view that contains camera zoom control and its layout. In addition to the
* zoom control, the method {@link #rotate} is added for rotation animation
* which is called in switching between first-level and second-level indicators.
*/
public class ZoomControlWheel extends ZoomControl {
private static final String TAG = "ZoomControlWheel";
private static final int HIGHLIGHT_WIDTH = 4;
private static final int HIGHLIGHT_DEGREES = 30;
private static final int TRAIL_WIDTH = 2;
private static final int ZOOM_IN_ICON_DEGREES = 96;
private static final int ZOOM_OUT_ICON_DEGREES = 264;
private static final int MAX_SLIDER_ANGLE =
ZOOM_OUT_ICON_DEGREES - (HIGHLIGHT_DEGREES / 2);
private static final int MIN_SLIDER_ANGLE =
ZOOM_IN_ICON_DEGREES + (HIGHLIGHT_DEGREES / 2);
private static final int DEFAULT_SLIDER_POSITION = MAX_SLIDER_ANGLE;
private static final float EDGE_STROKE_WIDTH = 6f;
private static final double BUFFER_RADIANS = Math.toRadians(HIGHLIGHT_DEGREES / 2);
private static final double SLIDER_RANGE =
Math.toRadians(MAX_SLIDER_ANGLE - MIN_SLIDER_ANGLE);
private double mSliderRadians = DEFAULT_SLIDER_POSITION;
private final int HIGHLIGHT_COLOR;
private final int TRAIL_COLOR;
// The center of the shutter button.
private int mCenterX, mCenterY;
// The width of the wheel stroke.
private int mStrokeWidth;
private double mShutterButtonRadius;
private double mWheelRadius;
private Paint mBackgroundPaint;
private RectF mBackgroundRect;
private double mRotateAngle;
public ZoomControlWheel(Context context, AttributeSet attrs) {
super(context, attrs);
setWillNotDraw(false);
mBackgroundPaint = new Paint();
mBackgroundPaint.setStyle(Paint.Style.STROKE);
mBackgroundPaint.setAntiAlias(true);
mBackgroundRect = new RectF();
Resources resources = context.getResources();
HIGHLIGHT_COLOR = resources.getColor(R.color.review_control_pressed_color);
TRAIL_COLOR = resources.getColor(R.color.icon_disabled_color);
mShutterButtonRadius = IndicatorControlWheelContainer.SHUTTER_BUTTON_RADIUS;
mStrokeWidth = Util.dpToPixel(IndicatorControlWheelContainer.STROKE_WIDTH);
mWheelRadius = mShutterButtonRadius + mStrokeWidth * 0.5;
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
if (!onFilterTouchEventForSecurity(event) || !isEnabled()) return false;
int action = event.getAction();
double dx = event.getX() - mCenterX;
double dy = mCenterY - event.getY();
double radius = Math.sqrt(dx * dx + dy * dy);
// Ignore the event if too far from the shutter button.
double angle = Math.atan2(dy, dx);
if (angle < 0) angle += (2 * Math.PI);
mSliderRadians = getSliderDrawAngle(angle);
// We assume the slider button is pressed all the time when the
// zoom control is active. So we take care of the following events
// only.
switch (action) {
case MotionEvent.ACTION_OUTSIDE:
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
closeZoomControl();
break;
case MotionEvent.ACTION_MOVE:
performZoom((Math.toRadians(MAX_SLIDER_ANGLE)
- mSliderRadians) / SLIDER_RANGE);
requestLayout();
}
return true;
}
@Override
public void startZoomControl() {
super.startZoomControl();
mSliderRadians = Math.toRadians(DEFAULT_SLIDER_POSITION);
}
private void layoutIcon(View view, double radian) {
// Rotate the wheel with the angle when the wheel is rotating or
// the indicator control is in the second-level.
radian += mRotateAngle;
int x = mCenterX + (int)(mWheelRadius * Math.cos(radian));
int y = mCenterY - (int)(mWheelRadius * Math.sin(radian));
int width = view.getMeasuredWidth();
int height = view.getMeasuredHeight();
view.layout(x - width / 2, y - height / 2, x + width / 2,
y + height / 2);
}
private double getSliderDrawAngle(double sliderAngle) {
if (sliderAngle > Math.toRadians(MAX_SLIDER_ANGLE)) {
return Math.toRadians(MAX_SLIDER_ANGLE);
} else if (sliderAngle < Math.toRadians(MIN_SLIDER_ANGLE)) {
return Math.toRadians(MIN_SLIDER_ANGLE);
}
return sliderAngle;
}
@Override
protected void onLayout(
boolean changed, int left, int top, int right, int bottom) {
mCenterX = right - left - Util.dpToPixel(
IndicatorControlWheelContainer.FULL_WHEEL_RADIUS);
mCenterY = (bottom - top) / 2;
layoutIcon(mZoomIn, Math.toRadians(ZOOM_IN_ICON_DEGREES));
layoutIcon(mZoomOut, Math.toRadians(ZOOM_OUT_ICON_DEGREES));
layoutIcon(mZoomSlider, getSliderDrawAngle(mSliderRadians));
}
private double getZoomIndexAngle() {
if (mZoomMax == 0) return Math.PI;
return Math.toRadians(MAX_SLIDER_ANGLE -
(MAX_SLIDER_ANGLE - MIN_SLIDER_ANGLE) * mZoomIndex / mZoomMax);
}
private void drawArc(Canvas canvas, int startAngle, int sweepAngle,
double radius, int color, int width) {
mBackgroundRect.set((float) (mCenterX - radius), (float) (mCenterY - radius),
(float) (mCenterX + radius), (float) (mCenterY + radius));
mBackgroundPaint.setStrokeWidth(width);
mBackgroundPaint.setStrokeCap(Paint.Cap.ROUND);
mBackgroundPaint.setColor(color);
canvas.drawArc(mBackgroundRect, startAngle, sweepAngle, false, mBackgroundPaint);
}
@Override
protected void onDraw(Canvas canvas) {
// Draw the slider trail.
int startAngle = -MAX_SLIDER_ANGLE - (int) Math.toDegrees(mRotateAngle);
int radians = (MAX_SLIDER_ANGLE - MIN_SLIDER_ANGLE);
if ((startAngle + radians) > 0) radians = -startAngle;
drawArc(canvas, startAngle, radians,
mWheelRadius, TRAIL_COLOR, TRAIL_WIDTH);
super.onDraw(canvas);
}
public void rotate(double angle) {
mRotateAngle = angle;
requestLayout();
}
}
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