Example usage for android.graphics Color alpha

Introduction

In this page you can find the example usage for android.graphics Color alpha.

Prototype

@IntRange(from = 0, to = 255)
public static int alpha(int color)

Source Link

Document

Return the alpha component of a color int.

Usage

From source file:Main.java

public static float colorToHSV(Context context, int colorResourceId) {

    int color = context.getResources().getColor(colorResourceId);

    int a = Color.alpha(color);
    int r = Color.red(color);
    int g = Color.green(color);
    int b = Color.blue(color);

    float[] hsv = new float[3];

    Color.RGBToHSV(r, g, b, hsv);

    return hsv[0];
}

From source file:Main.java

/**
 * Returns a color based that is ratio% of color1 and (1 - ratio)% of color2 (including alpha).
 *///from ww w . java  2s  . co m
private static int blendColors(int color1, int color2, double ratio) {
    double ir = 1.0 - ratio;

    int a = (int) (Color.alpha(color1) * ratio + Color.alpha(color2) * ir);
    int r = (int) (Color.red(color1) * ratio + Color.red(color2) * ir);
    int g = (int) (Color.green(color1) * ratio + Color.green(color2) * ir);
    int b = (int) (Color.blue(color1) * ratio + Color.blue(color2) * ir);

    return Color.argb(a, r, g, b);
}

From source file:Main.java

/**
 * Get a darker version of a color//from w  ww .  j a va  2  s.co  m
 * @param color the color to be darkened
 * @param factor the factor by which to darken the color
 * @return an integer representation of the darkened color
 */
private static int darker(int color, double factor) {
    int a = Color.alpha(color);
    int r = Color.red(color);
    int g = Color.green(color);
    int b = Color.blue(color);

    return Color.argb(a, Math.max((int) (r * factor), 0), Math.max((int) (g * factor), 0),
            Math.max((int) (b * factor), 0));
}

From source file:Main.java

public static int lighterColor(int color, float factor) {
    int red = (int) ((Color.red(color) * (1 - factor) / 255 + factor) * 255);
    int green = (int) ((Color.green(color) * (1 - factor) / 255 + factor) * 255);
    int blue = (int) ((Color.blue(color) * (1 - factor) / 255 + factor) * 255);
    return Color.argb(Color.alpha(color), red, green, blue);
}

From source file:Main.java

public static int lightenColor(int color, float factor) {
    float r = Color.red(color) * factor;
    float g = Color.green(color) * factor;
    float b = Color.blue(color) * factor;
    int ir = Math.min(255, (int) r);
    int ig = Math.min(255, (int) g);
    int ib = Math.min(255, (int) b);
    int ia = Color.alpha(color);
    return (Color.argb(ia, ir, ig, ib));
}

From source file:Main.java

public static int darker(int color, float amount) {
    float diff = 255 * amount;
    int r = (int) Math.max(0, (Color.red(color) - diff));
    int b = (int) Math.max(0, (Color.blue(color) - diff));
    int g = (int) Math.max(0, (Color.green(color) - diff));
    return Color.argb(Color.alpha(color), r, g, b);
}

From source file:Main.java

public static String getCssColor(int color) {
    // using %f for the double value would result in a localized string, e.g. 0,12 which
    // would be an invalid css color string
    return String.format("rgba(%d,%d,%d,%s)", Color.red(color), Color.green(color), Color.blue(color),
            Double.toString(Color.alpha(color) / 255.0));
}

From source file:Main.java

public static int darken(int color, double fraction) {
    int red = Color.red(color);
    int green = Color.green(color);
    int blue = Color.blue(color);
    red = darkenColor(red, fraction);/*from   w w w  . jav a2  s. c o  m*/
    green = darkenColor(green, fraction);
    blue = darkenColor(blue, fraction);
    int alpha = Color.alpha(color);

    return Color.argb(alpha, red, green, blue);
}

From source file:Main.java

public static int lighten(int color, double fraction) {
    int red = Color.red(color);
    int green = Color.green(color);
    int blue = Color.blue(color);
    red = lightenColor(red, fraction);//from   w  w  w  . j  av a 2 s  .  c o  m
    green = lightenColor(green, fraction);
    blue = lightenColor(blue, fraction);
    int alpha = Color.alpha(color);
    return Color.argb(alpha, red, green, blue);
}

From source file:Main.java

/**
 * Alters the alpha of a given color and spits out the new color.
 * @param color the color to change the alpha of.
 * @param value the new value of the alpha field.
 * @return the new color with the new alpha level.
 */// www. j a  va  2 s .  c  om
public static int getNewColorAlpha(int color, float value) {
    int alpha = Math.round(Color.alpha(color) * value);
    int r = Color.red(color);
    int g = Color.green(color);
    int b = Color.blue(color);
    return Color.argb(alpha, r, g, b);
}