Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Shader;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.PaintDrawable;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.RectShape;

import android.util.LruCache;
import android.view.Gravity;

public class Main {
    private static final LruCache<Integer, Drawable> cubicGradientScrimCache = new LruCache<>(10);

    /**
     * Creates an approximated cubic gradient using a multi-stop linear gradient. See
     * <a href="https://plus.google.com/+RomanNurik/posts/2QvHVFWrHZf">this post</a> for more
     * details.
     */
    public static Drawable makeCubicGradientScrimDrawable(int baseColor, int numStops, int gravity) {

        // Generate a cache key by hashing together the inputs, based on the method described in the Effective Java book
        int cacheKeyHash = baseColor;
        cacheKeyHash = 31 * cacheKeyHash + numStops;
        cacheKeyHash = 31 * cacheKeyHash + gravity;

        Drawable cachedGradient = cubicGradientScrimCache.get(cacheKeyHash);
        if (cachedGradient != null) {
            return cachedGradient;
        }

        numStops = Math.max(numStops, 2);

        PaintDrawable paintDrawable = new PaintDrawable();
        paintDrawable.setShape(new RectShape());

        final int[] stopColors = new int[numStops];

        int red = Color.red(baseColor);
        int green = Color.green(baseColor);
        int blue = Color.blue(baseColor);
        int alpha = Color.alpha(baseColor);

        for (int i = 0; i < numStops; i++) {
            float x = i * 1f / (numStops - 1);
            float opacity = Math.max(0, Math.min(1, (float) Math.pow(x, 3)));
            stopColors[i] = Color.argb((int) (alpha * opacity), red, green, blue);
        }

        final float x0, x1, y0, y1;
        switch (gravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
        case Gravity.START:
            x0 = 1;
            x1 = 0;
            break;
        case Gravity.END:
            x0 = 0;
            x1 = 1;
            break;
        default:
            x0 = 0;
            x1 = 0;
            break;
        }
        switch (gravity & Gravity.VERTICAL_GRAVITY_MASK) {
        case Gravity.TOP:
            y0 = 1;
            y1 = 0;
            break;
        case Gravity.BOTTOM:
            y0 = 0;
            y1 = 1;
            break;
        default:
            y0 = 0;
            y1 = 0;
            break;
        }

        paintDrawable.setShaderFactory(new ShapeDrawable.ShaderFactory() {
            @Override
            public Shader resize(int width, int height) {
                return new LinearGradient(width * x0, height * y0, width * x1, height * y1, stopColors, null,
                        Shader.TileMode.CLAMP);
            }
        });

        cubicGradientScrimCache.put(cacheKeyHash, paintDrawable);
        return paintDrawable;
    }
}