/*

* HaoRan ImageFilter Classes v0.1

* Copyright (C) 2012 Zhenjun Dai

*

* This library is free software; you can redistribute it and/or modify it

* under the terms of the GNU Lesser General Public License as published by the

* Free Software Foundation; either version 2.1 of the License, or (at your

* option) any later version.

*

* This library is distributed in the hope that it will be useful, but WITHOUT

* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License

* for more details.

*

* You should have received a copy of the GNU Lesser General Public License

* along with this library; if not, write to the Free Software Foundation.

*/

package HaoRan.ImageFilter;

import java.util.ArrayList;

import java.util.List;

import android.graphics.Color;

public class Gradient {

public List<Integer> MapColors;

public Gradient()

{

List<Integer> list = new ArrayList<Integer>();

list.add(Color.BLACK);

list.add(Color.WHITE);

this.MapColors = list;

}

public Gradient(List<Integer> colors)

{

this.MapColors = colors;

}

private Palette CreateGradient(List<Integer> colors, int length)

{

if (colors == null || colors.size() < 2){

return null;

}

Palette palette = new Palette(length);

int[] red = palette.Red;

int[] green = palette.Green;

int[] blue = palette.Blue;

int num = length / (colors.size() - 1);

float num1 = 1f / ((float)num);

int index = 0;

int rgb = colors.get(0);

int colorR = (rgb & 0x00FF0000) >> 16;

int colorG = (rgb & 0x0000FF00) >> 8;

int colorB = rgb & 0x000000FF;

for (int i = 1; i < colors.size(); i++){

int r = (colors.get(i) & 0x00FF0000) >> 16;

int g = (colors.get(i) & 0x0000FF00) >> 8;

int b = colors.get(i) & 0x000000FF;

for (int j = 0; j < num; j++) {

float num2 = j * num1;

int rr = colorR + ((int)((r - colorR) * num2));

int gg = colorG + ((int)((g - colorG) * num2));

int bb = colorB + ((int)((b - colorB) * num2));

red[index] = (rr > 0xff ? 0xff : ((rr < 0) ? 0 : rr));

green[index]= (gg > 0xff ? 0xff : ((gg < 0) ? 0 : gg));

blue[index] = (bb > 0xff ? 0xff : ((bb < 0) ? 0 : bb));

index++;

}

colorR = r;

colorG = g;

colorB = b;

}

if (index < length) {

red[index] = red[index - 1];

green[index] = green[index - 1];

blue[index] = blue[index - 1];

}

return palette;

}

public Palette CreatePalette(int length)

{

return CreateGradient(this.MapColors, length);

}

public static class TintColors

{

public static int LightCyan() {

return (0xff << 24) + (0xeb << 16) + (0xf5 << 8) + 0xe1;

}

public static int Sepia(){

return (0xff << 24) + (179 << 16) + (179 << 8) + 230;

}

}

public static Gradient BlackSepia()

{

List<Integer> colors = new ArrayList<Integer>();

colors.add(Color.BLACK);

colors.add(TintColors.Sepia());

return new Gradient(colors);

}

public static Gradient WhiteSepia()

{

List<Integer> colors = new ArrayList<Integer>();

colors.add(Color.WHITE);

colors.add(TintColors.Sepia());

return new Gradient(colors);

}

public static Gradient RainBow()

{

List<Integer> colors = new ArrayList<Integer>();

colors.add(Color.RED);

colors.add(Color.MAGENTA);

colors.add(Color.BLUE);

colors.add(Color.CYAN);

colors.add(Color.GREEN);

colors.add(Color.YELLOW);

colors.add(Color.RED);

return new Gradient(colors);

}

public static Gradient Inverse()

{

List<Integer> colors = new ArrayList<Integer>();

colors.add(Color.WHITE);

colors.add(Color.BLACK);

return new Gradient(colors);

}

public static Gradient Fade()

{

List<Integer> colors = new ArrayList<Integer>();

colors.add(Color.BLACK);

colors.add(Color.rgb(0xCD, 0xE8, 0xEE));//Cornsilk2 , reference http://www.wescn.com/tool/color_3.html

colors.add(Color.BLACK);

return new Gradient(colors);

}

public static Gradient Scene()

{

List<Integer> colors = new ArrayList<Integer>();

colors.add(Color.rgb(0x00, 0xD7, 0xFF));//Gold , reference http://www.wescn.com/tool/color_3.html

colors.add(Color.WHITE);

colors.add(Color.rgb(0x00, 0xD7, 0xFF));//Gold

return new Gradient(colors);

}

public static Gradient Scene1()

{

List<Integer> colors = new ArrayList<Integer>();

colors.add(Color.rgb(0xED, 0x95, 0x64));//CornflowerBlue , reference http://www.wescn.com/tool/color_3.html

colors.add(Color.WHITE);

colors.add(Color.rgb(0xED, 0x95, 0x64));//CornflowerBlue

return new Gradient(colors);

}

public static Gradient Scene2()

{

List<Integer> colors = new ArrayList<Integer>();

colors.add(Color.rgb(0xFF, 0xBF, 0x00));//DeepSkyBlue , reference http://www.wescn.com/tool/color_3.html

colors.add(Color.WHITE);

colors.add(Color.rgb(0xFF, 0xBF, 0x00));//DeepSkyBlue

return new Gradient(colors);

}

public static Gradient Scene3()

{

List<Integer> colors = new ArrayList<Integer>();

colors.add(Color.rgb(0x00, 0xa5, 0xff));// , reference http://www.wescn.com/tool/color_3.html

colors.add(Color.WHITE);

colors.add(Color.rgb(0x00, 0xa5, 0xff));//

return new Gradient(colors);

}

}