package com.betomaluje.miband.colorpicker;
/*
* Copyright 2013 Piotr Adamus
*
* 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.
*/
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ComposeShader;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Paint.Join;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.RadialGradient;
import android.graphics.RectF;
import android.graphics.Shader.TileMode;
import android.graphics.SweepGradient;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class ColorPicker extends View {
/**
* Customizable display parameters (in percents)
*/
private final int paramOuterPadding = 2; // outer padding of the whole color picker view
private final int paramInnerPadding = 5; // distance between value slider wheel and inner color wheel
private final int paramValueSliderWidth = 10; // width of the value slider
private final int paramArrowPointerSize = 4; // size of the arrow pointer; set to 0 to hide the pointer
private Paint colorWheelPaint;
private Paint valueSliderPaint;
private Paint colorViewPaint;
private Paint colorPointerPaint;
private RectF colorPointerCoords;
private Paint valuePointerPaint;
private Paint valuePointerArrowPaint;
private RectF outerWheelRect;
private RectF innerWheelRect;
private Path colorViewPath;
private Path valueSliderPath;
private Path arrowPointerPath;
private Bitmap colorWheelBitmap;
private int valueSliderWidth;
private int innerPadding;
private int outerPadding;
private int arrowPointerSize;
private int outerWheelRadius;
private int innerWheelRadius;
private int colorWheelRadius;
private Matrix gradientRotationMatrix;
/**
* Currently selected color
*/
private float[] colorHSV = new float[]{0f, 0f, 1f};
public ColorPicker(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public ColorPicker(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public ColorPicker(Context context) {
super(context);
init();
}
private void init() {
colorPointerPaint = new Paint();
colorPointerPaint.setStyle(Style.STROKE);
colorPointerPaint.setStrokeWidth(2f);
colorPointerPaint.setARGB(128, 0, 0, 0);
valuePointerPaint = new Paint();
valuePointerPaint.setStyle(Style.STROKE);
valuePointerPaint.setStrokeWidth(2f);
valuePointerArrowPaint = new Paint();
colorWheelPaint = new Paint();
colorWheelPaint.setAntiAlias(true);
colorWheelPaint.setDither(true);
valueSliderPaint = new Paint();
valueSliderPaint.setAntiAlias(true);
valueSliderPaint.setDither(true);
colorViewPaint = new Paint();
colorViewPaint.setAntiAlias(true);
colorViewPath = new Path();
valueSliderPath = new Path();
arrowPointerPath = new Path();
outerWheelRect = new RectF();
innerWheelRect = new RectF();
colorPointerCoords = new RectF();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int size = Math.min(widthSize, heightSize);
setMeasuredDimension(size, size);
}
@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas) {
int centerX = getWidth() / 2;
int centerY = getHeight() / 2;
// drawing color wheel
canvas.drawBitmap(colorWheelBitmap, centerX - colorWheelRadius, centerY - colorWheelRadius, null);
// drawing color view
colorViewPaint.setColor(Color.HSVToColor(colorHSV));
canvas.drawPath(colorViewPath, colorViewPaint);
// drawing value slider
float[] hsv = new float[]{colorHSV[0], colorHSV[1], 1f};
SweepGradient sweepGradient = new SweepGradient(centerX, centerY, new int[]{Color.BLACK, Color.HSVToColor(hsv), Color.WHITE}, null);
sweepGradient.setLocalMatrix(gradientRotationMatrix);
valueSliderPaint.setShader(sweepGradient);
canvas.drawPath(valueSliderPath, valueSliderPaint);
// drawing color wheel pointer
float hueAngle = (float) Math.toRadians(colorHSV[0]);
int colorPointX = (int) (-Math.cos(hueAngle) * colorHSV[1] * colorWheelRadius) + centerX;
int colorPointY = (int) (-Math.sin(hueAngle) * colorHSV[1] * colorWheelRadius) + centerY;
float pointerRadius = 0.075f * colorWheelRadius;
int pointerX = (int) (colorPointX - pointerRadius / 2);
int pointerY = (int) (colorPointY - pointerRadius / 2);
colorPointerCoords.set(pointerX, pointerY, pointerX + pointerRadius, pointerY + pointerRadius);
canvas.drawOval(colorPointerCoords, colorPointerPaint);
// drawing value pointer
valuePointerPaint.setColor(Color.HSVToColor(new float[]{0f, 0f, 1f - colorHSV[2]}));
double valueAngle = (colorHSV[2] - 0.5f) * Math.PI;
float valueAngleX = (float) Math.cos(valueAngle);
float valueAngleY = (float) Math.sin(valueAngle);
canvas.drawLine(valueAngleX * innerWheelRadius + centerX, valueAngleY * innerWheelRadius + centerY, valueAngleX * outerWheelRadius + centerX,
valueAngleY * outerWheelRadius + centerY, valuePointerPaint);
// drawing pointer arrow
if (arrowPointerSize > 0) {
drawPointerArrow(canvas);
}
}
private void drawPointerArrow(Canvas canvas) {
int centerX = getWidth() / 2;
int centerY = getHeight() / 2;
double tipAngle = (colorHSV[2] - 0.5f) * Math.PI;
double leftAngle = tipAngle + Math.PI / 96;
double rightAngle = tipAngle - Math.PI / 96;
double tipAngleX = Math.cos(tipAngle) * outerWheelRadius;
double tipAngleY = Math.sin(tipAngle) * outerWheelRadius;
double leftAngleX = Math.cos(leftAngle) * (outerWheelRadius + arrowPointerSize);
double leftAngleY = Math.sin(leftAngle) * (outerWheelRadius + arrowPointerSize);
double rightAngleX = Math.cos(rightAngle) * (outerWheelRadius + arrowPointerSize);
double rightAngleY = Math.sin(rightAngle) * (outerWheelRadius + arrowPointerSize);
arrowPointerPath.reset();
arrowPointerPath.moveTo((float) tipAngleX + centerX, (float) tipAngleY + centerY);
arrowPointerPath.lineTo((float) leftAngleX + centerX, (float) leftAngleY + centerY);
arrowPointerPath.lineTo((float) rightAngleX + centerX, (float) rightAngleY + centerY);
arrowPointerPath.lineTo((float) tipAngleX + centerX, (float) tipAngleY + centerY);
valuePointerArrowPaint.setColor(Color.HSVToColor(colorHSV));
valuePointerArrowPaint.setStyle(Style.FILL);
canvas.drawPath(arrowPointerPath, valuePointerArrowPaint);
valuePointerArrowPaint.setStyle(Style.STROKE);
valuePointerArrowPaint.setStrokeJoin(Join.ROUND);
valuePointerArrowPaint.setColor(Color.BLACK);
canvas.drawPath(arrowPointerPath, valuePointerArrowPaint);
}
@Override
protected void onSizeChanged(int width, int height, int oldw, int oldh) {
int centerX = width / 2;
int centerY = height / 2;
innerPadding = (int) (paramInnerPadding * width / 100);
outerPadding = (int) (paramOuterPadding * width / 100);
arrowPointerSize = (int) (paramArrowPointerSize * width / 100);
valueSliderWidth = (int) (paramValueSliderWidth * width / 100);
outerWheelRadius = width / 2 - outerPadding - arrowPointerSize;
innerWheelRadius = outerWheelRadius - valueSliderWidth;
colorWheelRadius = innerWheelRadius - innerPadding;
outerWheelRect.set(centerX - outerWheelRadius, centerY - outerWheelRadius, centerX + outerWheelRadius, centerY + outerWheelRadius);
innerWheelRect.set(centerX - innerWheelRadius, centerY - innerWheelRadius, centerX + innerWheelRadius, centerY + innerWheelRadius);
colorWheelBitmap = createColorWheelBitmap(colorWheelRadius * 2, colorWheelRadius * 2);
gradientRotationMatrix = new Matrix();
gradientRotationMatrix.preRotate(270, width / 2, height / 2);
colorViewPath.arcTo(outerWheelRect, 270, -180);
colorViewPath.arcTo(innerWheelRect, 90, 180);
valueSliderPath.arcTo(outerWheelRect, 270, 180);
valueSliderPath.arcTo(innerWheelRect, 90, -180);
}
private Bitmap createColorWheelBitmap(int width, int height) {
Bitmap bitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
int colorCount = 12;
int colorAngleStep = 360 / 12;
int colors[] = new int[colorCount + 1];
float hsv[] = new float[]{0f, 1f, 1f};
for (int i = 0; i < colors.length; i++) {
hsv[0] = (i * colorAngleStep + 180) % 360;
colors[i] = Color.HSVToColor(hsv);
}
colors[colorCount] = colors[0];
SweepGradient sweepGradient = new SweepGradient(width / 2, height / 2, colors, null);
RadialGradient radialGradient = new RadialGradient(width / 2, height / 2, colorWheelRadius, 0xFFFFFFFF, 0x00FFFFFF, TileMode.CLAMP);
ComposeShader composeShader = new ComposeShader(sweepGradient, radialGradient, PorterDuff.Mode.SRC_OVER);
colorWheelPaint.setShader(composeShader);
Canvas canvas = new Canvas(bitmap);
canvas.drawCircle(width / 2, height / 2, colorWheelRadius, colorWheelPaint);
return bitmap;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
int x = (int) event.getX();
int y = (int) event.getY();
int cx = x - getWidth() / 2;
int cy = y - getHeight() / 2;
double d = Math.sqrt(cx * cx + cy * cy);
if (d <= colorWheelRadius) {
colorHSV[0] = (float) (Math.toDegrees(Math.atan2(cy, cx)) + 180f);
colorHSV[1] = Math.max(0f, Math.min(1f, (float) (d / colorWheelRadius)));
invalidate();
} else if (x >= getWidth() / 2 && d >= innerWheelRadius) {
colorHSV[2] = (float) Math.max(0, Math.min(1, Math.atan2(cy, cx) / Math.PI + 0.5f));
invalidate();
}
return true;
}
return super.onTouchEvent(event);
}
public void setColor(int color) {
Color.colorToHSV(color, colorHSV);
}
public int getColor() {
return Color.HSVToColor(colorHSV);
}
@Override
protected Parcelable onSaveInstanceState() {
Bundle state = new Bundle();
state.putFloatArray("color", colorHSV);
state.putParcelable("super", super.onSaveInstanceState());
return state;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
if (state instanceof Bundle) {
Bundle bundle = (Bundle) state;
colorHSV = bundle.getFloatArray("color");
super.onRestoreInstanceState(bundle.getParcelable("super"));
} else {
super.onRestoreInstanceState(state);
}
}
}
