diff options
Diffstat (limited to 'demokit/app/src/com/google/android/DemoKit/ColorWheel.java')
| -rw-r--r-- | demokit/app/src/com/google/android/DemoKit/ColorWheel.java | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/demokit/app/src/com/google/android/DemoKit/ColorWheel.java b/demokit/app/src/com/google/android/DemoKit/ColorWheel.java new file mode 100644 index 0000000..a1292cc --- /dev/null +++ b/demokit/app/src/com/google/android/DemoKit/ColorWheel.java @@ -0,0 +1,229 @@ +/* + * Copyright (C) 2011 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.google.android.DemoKit; + +import android.content.Context; +import android.graphics.*; +import android.util.AttributeSet; +import android.view.MotionEvent; +import android.view.View; + + +/* This class was masterfully pilfered, Carmen-Sandiego style, from our awesome sample app + * ApiDemos. To see how it looks as a dialog, check out: + * http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/ColorPickerDialog.html + * + */ + + public class ColorWheel extends View { + public interface OnColorChangedListener { + void colorChanged(int color); + } + + /* + */ + + private OnColorChangedListener mListener; + + private int mInitialColor; + + private Paint mPaint; + private Paint mCenterPaint; + private final int[] mColors; + + public void setOnColorChangedListener(OnColorChangedListener l) { + mListener = l; + } + + + public ColorWheel(Context c, AttributeSet attributes) { + + super(c, attributes); + + 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(0); + mCenterPaint.setStrokeWidth(5); + } + + + + private boolean mTrackingCenter; + private boolean mHighlightCenter; + + @Override + protected void onDraw(Canvas canvas) { + super.onDraw(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 = 200; + private static final int CENTER_Y = 200; + private static final int CENTER_RADIUS = 64; + + 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(); + mListener.colorChanged(mCenterPaint.getColor()); + } + break; + case MotionEvent.ACTION_UP: + if (mTrackingCenter) { + if (inCenter) { + mListener.colorChanged(mCenterPaint.getColor()); + } + mListener.colorChanged(0); + // mListener.colorChanged(mCenterPaint.getColor()); + mTrackingCenter = false; // so we draw w/o halo + invalidate(); + } + break; + } + return true; + } + } |