/* * Copyright (C) 2007 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.example.android.apis.graphics;import android.R;import android.os.Bundle;import android.app.Dialog;import android.content.Context;import android.graphics.*;import android.view.MotionEvent;import android.view.View;public class ColorPickerDialog extends Dialog {    public interface OnColorChangedListener {        void colorChanged(int color);    }    private OnColorChangedListener mListener;    private int mInitialColor;    private static class ColorPickerView extends View {        private Paint mPaint;        private Paint mCenterPaint;        private final int[] mColors;        private OnColorChangedListener mListener;                ColorPickerView(Context c, OnColorChangedListener l, int color) {            super(c);            mListener = l;            mColors = new int[] {                0xFFFF0000, 0xFFFF00FF, 0xFF0000FF, 0xFF00FFFF, 0xFF00FF00,                0xFFFFFF00, 0xFFFF0000            };            Shader s = new SweepGradient(0, 0, mColors, null);                        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);            mPaint.setShader(s);            mPaint.setStyle(Paint.Style.STROKE);            mPaint.setStrokeWidth(32);                        mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);            mCenterPaint.setColor(color);            mCenterPaint.setStrokeWidth(5);        }                private boolean mTrackingCenter;        private boolean mHighlightCenter;        @Override         protected void onDraw(Canvas canvas) {            float r = CENTER_X - mPaint.getStrokeWidth()*0.5f;                        canvas.translate(CENTER_X, CENTER_X);                        canvas.drawOval(new RectF(-r, -r, r, r), mPaint);                        canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);                        if (mTrackingCenter) {                int c = mCenterPaint.getColor();                mCenterPaint.setStyle(Paint.Style.STROKE);                                if (mHighlightCenter) {                    mCenterPaint.setAlpha(0xFF);                } else {                    mCenterPaint.setAlpha(0x80);                }                canvas.drawCircle(0, 0,                                  CENTER_RADIUS + mCenterPaint.getStrokeWidth(),                                  mCenterPaint);                                mCenterPaint.setStyle(Paint.Style.FILL);                mCenterPaint.setColor(c);            }        }                @Override        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {            setMeasuredDimension(CENTER_X*2, CENTER_Y*2);        }                private static final int CENTER_X = 100;        private static final int CENTER_Y = 100;        private static final int CENTER_RADIUS = 32;        private int floatToByte(float x) {            int n = java.lang.Math.round(x);            return n;        }        private int pinToByte(int n) {            if (n < 0) {                n = 0;            } else if (n > 255) {                n = 255;            }            return n;        }                private int ave(int s, int d, float p) {            return s + java.lang.Math.round(p * (d - s));        }                private int interpColor(int colors[], float unit) {            if (unit <= 0) {                return colors[0];            }            if (unit >= 1) {                return colors[colors.length - 1];            }                        float p = unit * (colors.length - 1);            int i = (int)p;            p -= i;            // now p is just the fractional part [0...1) and i is the index            int c0 = colors[i];            int c1 = colors[i+1];            int a = ave(Color.alpha(c0), Color.alpha(c1), p);            int r = ave(Color.red(c0), Color.red(c1), p);            int g = ave(Color.green(c0), Color.green(c1), p);            int b = ave(Color.blue(c0), Color.blue(c1), p);                        return Color.argb(a, r, g, b);        }                private int rotateColor(int color, float rad) {            float deg = rad * 180 / 3.1415927f;            int r = Color.red(color);            int g = Color.green(color);            int b = Color.blue(color);                        ColorMatrix cm = new ColorMatrix();            ColorMatrix tmp = new ColorMatrix();            cm.setRGB2YUV();            tmp.setRotate(0, deg);            cm.postConcat(tmp);            tmp.setYUV2RGB();            cm.postConcat(tmp);                        final float[] a = cm.getArray();            int ir = floatToByte(a[0] * r +  a[1] * g +  a[2] * b);            int ig = floatToByte(a[5] * r +  a[6] * g +  a[7] * b);            int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b);                        return Color.argb(Color.alpha(color), pinToByte(ir),                              pinToByte(ig), pinToByte(ib));        }                private static final float PI = 3.1415926f;        @Override        public boolean onTouchEvent(MotionEvent event) {            float x = event.getX() - CENTER_X;            float y = event.getY() - CENTER_Y;            boolean inCenter = java.lang.Math.sqrt(x*x + y*y) <= CENTER_RADIUS;                        switch (event.getAction()) {                case MotionEvent.ACTION_DOWN:                    mTrackingCenter = inCenter;                    if (inCenter) {                        mHighlightCenter = true;                        invalidate();                        break;                    }                case MotionEvent.ACTION_MOVE:                    if (mTrackingCenter) {                        if (mHighlightCenter != inCenter) {                            mHighlightCenter = inCenter;                            invalidate();                        }                    } else {                        float angle = (float)java.lang.Math.atan2(y, x);                        // need to turn angle [-PI ... PI] into unit [0....1]                        float unit = angle/(2*PI);                        if (unit < 0) {                            unit += 1;                        }                        mCenterPaint.setColor(interpColor(mColors, unit));                        invalidate();                    }                    break;                case MotionEvent.ACTION_UP:                    if (mTrackingCenter) {                        if (inCenter) {                            mListener.colorChanged(mCenterPaint.getColor());                        }                        mTrackingCenter = false;    // so we draw w/o halo                        invalidate();                    }                    break;            }            return true;        }    }    public ColorPickerDialog(Context context,                             OnColorChangedListener listener,                             int initialColor) {        super(context);                mListener = listener;        mInitialColor = initialColor;    }    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        OnColorChangedListener l = new OnColorChangedListener() {            public void colorChanged(int color) {                mListener.colorChanged(color);                dismiss();            }        };        setContentView(new ColorPickerView(getContext(), l, mInitialColor));        setTitle("Pick a Color");    }}