package com.bosi.chineseclass.views.paint;
import android.os.Bundle;
import android.app.Dialog;
import android.content.Context;
import android.graphics.*;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
public class ColorPickerDialog extends Dialog {
public interface OnColorChangedListener {
void colorChanged(int color);
}
private OnColorChangedListener mListener;
private int mInitialColor;
private Context context;
private static class ColorPickerView extends View {
private Paint mPaint;
private Paint mCenterPaint;
private Paint mHSVPaint;
private final int[] mColors;
private int[] mHSVColors;
private boolean mRedrawHSV;
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(80);
mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCenterPaint.setColor(color);
mCenterPaint.setStrokeWidth(5);
mHSVColors = new int[] { 0xFF000000, color, 0xFFFFFFFF };
mHSVPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mHSVPaint.setStrokeWidth(10);
mRedrawHSV = true;
}
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);
int c = mCenterPaint.getColor();
if (mRedrawHSV) {
mHSVColors[1] = c;
mHSVPaint.setShader(new LinearGradient(-100, 0, 100, 0,
mHSVColors, null, Shader.TileMode.CLAMP));
}
canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);
canvas.drawRect(new RectF(-150, 200, 150, 160), mHSVPaint);
if (mTrackingCenter) {
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);
}
mRedrawHSV = true;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(CENTER_X * 2, (CENTER_Y + 25) * 2);
}
private static final int CENTER_X = 150;
private static final int CENTER_Y = 150;
private static final int CENTER_RADIUS = 50;
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 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 >= -150 & x <= 150) && (y <= 200 && y >= 160))
// see
// if
// we're
// in
// the
// hsv
// slider
{
int a, r, g, b, c0, c1;
float p;
// set the center paint to this color
if (x < 0) {
c0 = mHSVColors[0];
c1 = mHSVColors[1];
p = (x + 150) / 150;
} else {
c0 = mHSVColors[1];
c1 = mHSVColors[2];
p = x / 150;
}
a = ave(Color.alpha(c0), Color.alpha(c1), p);
r = ave(Color.red(c0), Color.red(c1), p);
g = ave(Color.green(c0), Color.green(c1), p);
b = ave(Color.blue(c0), Color.blue(c1), p);
mCenterPaint.setColor(Color.argb(a, r, g, b));
mRedrawHSV = false;
invalidate();
}//ȷ������ѡ���������
else if ((Math.pow(x, 2) + Math.pow(y, 2)) < 150 * 150) {
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);
this.context = 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();
}
};
LinearLayout layout = new LinearLayout(context);
layout.addView(new ColorPickerView(getContext(), l, mInitialColor));
layout.setPadding(30, 20, 20, 30);
setContentView(layout);
setCanceledOnTouchOutside(true);
setTitle("颜色选择");
}
}