/*
* 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 net.redgeek.android.eventrend.util;
import android.app.Dialog;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
/**
* Slightly modified verions of the ColorPickerDialog class from the DemoApi
* examples.
*
* @author Google DemoApis
* @author barclay (modifications)
*
*/
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 mSaturationPaint;
private Paint mValuePaint;
private Paint mCenterPaint;
private int[] mColors;
private int[] mSaturations;
private int[] mValues;
private OnColorChangedListener mListener;
ColorPickerView(Context c, OnColorChangedListener l, int color) {
super(c);
mListener = l;
mColors = new int[] { 0xFFFF0000, 0xFFFF00FF, 0xFF0000FF, 0xFF00FFFF,
0xFF00FF00, 0xFFFFFF00, 0xFFFF0000 };
mSaturations = new int[] { 0xFFFFFFFF, 0xFF000000 };
mValues = new int[] { 0xFFFFFFFF, 0xFF000000 };
Shader h = new SweepGradient(0, 0, mColors, null);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setShader(h);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(32);
Shader s = new LinearGradient(0, -CENTER_Y + 5, 0, CENTER_Y - 5,
mSaturations, null, Shader.TileMode.CLAMP);
mSaturationPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mSaturationPaint.setShader(s);
mSaturationPaint.setStyle(Paint.Style.STROKE);
mSaturationPaint.setStrokeWidth(SATURATION_STRIPE);
Shader v = new LinearGradient(-CENTER_X + 5, 0, CENTER_X - 5, 0, mValues,
null, Shader.TileMode.CLAMP);
mValuePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mValuePaint.setShader(v);
mValuePaint.setStyle(Paint.Style.STROKE);
mValuePaint.setStrokeWidth(SATURATION_STRIPE);
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);
Shader s = new SweepGradient(0, 0, mColors, null);
mPaint.setShader(s);
canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);
canvas.drawRect(new RectF(r + mPaint.getStrokeWidth() + DIVIDER_PAD, -r,
r + mPaint.getStrokeWidth() + DIVIDER_PAD + SATURATION_STRIPE, r),
mSaturationPaint);
canvas.drawRect(new RectF(-r, r + mPaint.getStrokeWidth() + DIVIDER_PAD,
r, r + mPaint.getStrokeWidth() + DIVIDER_PAD + SATURATION_STRIPE),
mValuePaint);
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 + EXTRA_RIGHT, CENTER_Y * 2
+ EXTRA_BOTTOM);
}
private static final int CENTER_X = 100;
private static final int CENTER_Y = 100;
private static final int DIVIDER_PAD = 10;
private static final int SATURATION_STRIPE = 30;
private static final int EXTRA_RIGHT = DIVIDER_PAD + SATURATION_STRIPE;
private static final int EXTRA_BOTTOM = DIVIDER_PAD + SATURATION_STRIPE;
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 shadeColorSaturation(int colors[], Paint p, float unit) {
float[] hsv = new float[3];
for (int i = 0; i < mColors.length; i++) {
Color.colorToHSV(mColors[i], hsv);
hsv[1] = unit;
mColors[i] = Color.HSVToColor(hsv);
}
Color.colorToHSV(p.getColor(), hsv);
hsv[1] = unit;
return Color.HSVToColor(hsv);
}
private int shadeColorValue(int colors[], Paint p, float unit) {
float[] hsv = new float[3];
for (int i = 0; i < mColors.length; i++) {
Color.colorToHSV(mColors[i], hsv);
hsv[2] = unit;
mColors[i] = Color.HSVToColor(hsv);
}
Color.colorToHSV(p.getColor(), hsv);
hsv[2] = unit;
return Color.HSVToColor(hsv);
}
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 {
if (x < CENTER_X && y < CENTER_Y) {
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();
} else if (x > CENTER_X) {
float unit = ((y + CENTER_Y) / (CENTER_Y * 2));
unit = Number.Clamp(unit, 0.0f, 1.0f);
mCenterPaint.setColor(shadeColorSaturation(mColors, mCenterPaint,
unit));
invalidate();
} else if (y > CENTER_Y) {
float unit = 1 - ((x + CENTER_X) / (CENTER_X * 2));
unit = Number.Clamp(unit, 0.0f, 1.0f);
mCenterPaint
.setColor(shadeColorValue(mColors, mCenterPaint, 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");
}
}