| /* |
| * 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.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; |
| } |
| |
| @Override |
| 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"); |
| } |
| } |