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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);//环形渐变,第1,2参数指定渐变中心; mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);//该画笔用来绘制外部圆环。 mPaint.setShader(s);//环形渐变灰覆盖掉画笔颜色。 mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(32); mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);//该画笔用来绘制内圆。内圆点亮时显示。 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;//外圆环的半径(减去画笔1/2宽度)。 canvas.translate(CENTER_X, CENTER_X);//平移画布 canvas.drawOval(new RectF(-r, -r, r, r), mPaint); //画外间圆环。 canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);//画内圆 if (mTrackingCenter) {//当触摸状态为移动时 int c = mCenterPaint.getColor();//取当前内圆颜色 mCenterPaint.setStyle(Paint.Style.STROKE);//画笔设为描边风格 if (mHighlightCenter) {//当移动范围在内圆上时 mCenterPaint.setAlpha(0xFF);//中间圆环透明度为100% } else { mCenterPaint.setAlpha(0x80);//中间圆环透明度为80% } canvas.drawCircle(0, 0, CENTER_RADIUS + mCenterPaint.getStrokeWidth(), mCenterPaint); mCenterPaint.setStyle(Paint.Style.FILL);//画完中间圆环将画笔风格还原。 mCenterPaint.setColor(c);//画完中间圆环将画笔颜色还原。 } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { setMeasuredDimension(CENTER_X*2, CENTER_Y*2);//设定View尺寸为宽高2倍 } 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) {//修正色值 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;//确定颜色位于mColor数组7个元素分成的6个区间的哪一个。 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);//在颜色区间内分别取该点颜色A,R,G,B。 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) {//利用ColorMatrix取色 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;//是否落在内圆 switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mTrackingCenter = inCenter;//如果触摸落点在内圆里,则为确认模式,否则为取色模式。 if (inCenter) { mHighlightCenter = true;//如果触摸落点在内圆里,则显示中间圆环。 invalidate(); break; } case MotionEvent.ACTION_MOVE: if (mTrackingCenter) {//如果为确认模式, if (mHighlightCenter != inCenter) { mHighlightCenter = inCenter; invalidate(); } } else {//如果为选色模式 float angle = (float)java.lang.Math.atan2(y, x);//反正切求圆心角度 // 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));//取色; 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() {//设置颜色监听 public void colorChanged(int color) { mListener.colorChanged(color); dismiss(); } }; setContentView(new ColorPickerView(getContext(), l, mInitialColor)); setTitle("Pick a Color"); } }
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2012-11-28 02:48 0http://www.linuxidc.com/Linux/2 ... -
Api Demo - .graphics(24)>>Cube
2012-08-03 15:18 1126package com.example.android.api ... -
Api Demo - .graphics(24)>>TouchRotateActivity
2012-08-03 15:07 1020package com.example.android.api ... -
Api Demo - .graphics(23)>>CubeMapActivity
2012-07-31 16:31 1369package com.opengl.test; imp ... -
opengles 学习关键字
2012-07-24 09:35 624主动渲染、平面着色、透视投影、near、索引法、glLight ... -
Api Demo - .graphics(21)>>StaticTriangleRenderer
2012-07-23 17:51 1224package com.example.android.api ... -
Api Demo - .graphics(20)>>CompressedTextureActivity
2012-07-23 16:50 1355/* * Copyright (C) 2008 The A ... -
Api Demo - .graphics(19)
2012-07-20 22:45 709package com.example.android.api ... -
Api Demo - .graphics(18)
2012-07-20 10:32 811package com.example.android.api ... -
Api Demo - .graphics(17)
2012-07-19 11:43 924/* package com.example.andro ... -
Api Demo - .graphics(16)
2012-07-18 14:54 595package com.example.android.api ... -
Api Demo - .graphics(15)
2012-07-18 12:55 788package com.example.android.api ... -
Api Demo - .graphics(13)
2012-07-17 11:38 892//关键字 Paint,MaskFilte,Path,Xfer ... -
Api Demo - .graphics(12)
2012-07-17 10:44 635<?xml version="1.0" ... -
Api Demo - .graphics(11)
2012-07-17 09:53 773//关键字:Shader ,ShapeDrawable pa ... -
Api Demo - .graphics(10)
2012-07-16 17:59 1033/* * Copyright (C) 2008 The A ... -
Api Demo - .graphics(9)
2012-07-16 11:26 741//关键字:颜色合成,JPEG,PNG图片解压,Bitmap压 ... -
Api Demo - .graphics(8)
2012-07-16 10:43 644//关键字:ColorMatrixColorFilter; ... -
Api Demo - .graphics(7)
2012-07-16 09:53 717// 关键字:Porter-Duff package c ... -
Api Demo - .graphics(6)
2012-07-16 08:57 755//关键字:截取画布 p ...
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