color picker
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/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.solovyev.android.view.widgets;
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import android.os.Bundle;
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import android.app.Dialog;
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import android.content.Context;
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import android.graphics.*;
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import android.view.MotionEvent;
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import android.view.View;
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public class ColorPickerDialog extends Dialog {
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public interface OnColorChangedListener {
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void colorChanged(int color);
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}
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private OnColorChangedListener mListener;
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private int mInitialColor;
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private static class ColorPickerView extends View {
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private Paint mPaint;
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private Paint mCenterPaint;
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private final int[] mColors;
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private OnColorChangedListener mListener;
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ColorPickerView(Context c, OnColorChangedListener l, int color) {
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super(c);
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mListener = l;
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mColors = new int[]{
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0xFFFF0000, 0xFFFF00FF, 0xFF0000FF, 0xFF00FFFF, 0xFF00FF00,
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0xFFFFFF00, 0xFFFF0000
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};
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Shader s = new SweepGradient(0, 0, mColors, null);
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mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
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mPaint.setShader(s);
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mPaint.setStyle(Paint.Style.STROKE);
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mPaint.setStrokeWidth(32);
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mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
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mCenterPaint.setColor(color);
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mCenterPaint.setStrokeWidth(5);
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}
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private boolean mTrackingCenter;
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private boolean mHighlightCenter;
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@Override
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protected void onDraw(Canvas canvas) {
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float r = CENTER_X - mPaint.getStrokeWidth() * 0.5f;
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canvas.translate(CENTER_X, CENTER_X);
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canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
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canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);
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if (mTrackingCenter) {
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int c = mCenterPaint.getColor();
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mCenterPaint.setStyle(Paint.Style.STROKE);
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if (mHighlightCenter) {
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mCenterPaint.setAlpha(0xFF);
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} else {
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mCenterPaint.setAlpha(0x80);
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}
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canvas.drawCircle(0, 0,
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CENTER_RADIUS + mCenterPaint.getStrokeWidth(),
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mCenterPaint);
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mCenterPaint.setStyle(Paint.Style.FILL);
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mCenterPaint.setColor(c);
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}
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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setMeasuredDimension(CENTER_X * 2, CENTER_Y * 2);
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}
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private static final int CENTER_X = 100;
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private static final int CENTER_Y = 100;
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private static final int CENTER_RADIUS = 32;
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private int floatToByte(float x) {
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int n = java.lang.Math.round(x);
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return n;
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}
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private int pinToByte(int n) {
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if (n < 0) {
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n = 0;
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} else if (n > 255) {
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n = 255;
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}
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return n;
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}
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private int ave(int s, int d, float p) {
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return s + java.lang.Math.round(p * (d - s));
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}
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private int interpColor(int colors[], float unit) {
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if (unit <= 0) {
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return colors[0];
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}
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if (unit >= 1) {
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return colors[colors.length - 1];
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}
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float p = unit * (colors.length - 1);
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int i = (int) p;
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p -= i;
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// now p is just the fractional part [0...1) and i is the index
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int c0 = colors[i];
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int c1 = colors[i + 1];
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int a = ave(Color.alpha(c0), Color.alpha(c1), p);
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int r = ave(Color.red(c0), Color.red(c1), p);
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int g = ave(Color.green(c0), Color.green(c1), p);
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int b = ave(Color.blue(c0), Color.blue(c1), p);
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return Color.argb(a, r, g, b);
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}
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private int rotateColor(int color, float rad) {
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float deg = rad * 180 / 3.1415927f;
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int r = Color.red(color);
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int g = Color.green(color);
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int b = Color.blue(color);
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ColorMatrix cm = new ColorMatrix();
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ColorMatrix tmp = new ColorMatrix();
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cm.setRGB2YUV();
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tmp.setRotate(0, deg);
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cm.postConcat(tmp);
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tmp.setYUV2RGB();
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cm.postConcat(tmp);
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final float[] a = cm.getArray();
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int ir = floatToByte(a[0] * r + a[1] * g + a[2] * b);
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int ig = floatToByte(a[5] * r + a[6] * g + a[7] * b);
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int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b);
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return Color.argb(Color.alpha(color), pinToByte(ir),
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pinToByte(ig), pinToByte(ib));
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}
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private static final float PI = 3.1415926f;
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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float x = event.getX() - CENTER_X;
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float y = event.getY() - CENTER_Y;
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boolean inCenter = java.lang.Math.sqrt(x * x + y * y) <= CENTER_RADIUS;
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switch (event.getAction()) {
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case MotionEvent.ACTION_DOWN:
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mTrackingCenter = inCenter;
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if (inCenter) {
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mHighlightCenter = true;
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invalidate();
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break;
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}
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case MotionEvent.ACTION_MOVE:
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if (mTrackingCenter) {
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if (mHighlightCenter != inCenter) {
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mHighlightCenter = inCenter;
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invalidate();
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}
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} else {
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float angle = (float) java.lang.Math.atan2(y, x);
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// need to turn angle [-PI ... PI] into unit [0....1]
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float unit = angle / (2 * PI);
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if (unit < 0) {
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unit += 1;
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}
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mCenterPaint.setColor(interpColor(mColors, unit));
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invalidate();
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}
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break;
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case MotionEvent.ACTION_UP:
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if (mTrackingCenter) {
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if (inCenter) {
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mListener.colorChanged(mCenterPaint.getColor());
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}
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mTrackingCenter = false; // so we draw w/o halo
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invalidate();
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}
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break;
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}
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return true;
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}
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}
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public ColorPickerDialog(Context context,
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OnColorChangedListener listener,
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int initialColor) {
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super(context);
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mListener = listener;
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mInitialColor = initialColor;
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}
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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OnColorChangedListener l = new OnColorChangedListener() {
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public void colorChanged(int color) {
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mListener.colorChanged(color);
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dismiss();
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}
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};
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setContentView(new ColorPickerView(getContext(), l, mInitialColor));
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setTitle("Pick a Color");
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}
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}
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