RectUtils.java

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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
package org.mozilla.gecko.gfx;
 
import android.graphics.Point;
import android.graphics.PointF;
import android.graphics.Rect;
import android.graphics.RectF;
 
import org.mozilla.gecko.util.FloatUtils;
 
public final class RectUtils {
    private RectUtils() {}
 
    public static RectF expand(RectF rect, float moreWidth, float moreHeight) {
        float halfMoreWidth = moreWidth / 2;
        float halfMoreHeight = moreHeight / 2;
        return new RectF(rect.left - halfMoreWidth,
                         rect.top - halfMoreHeight,
                         rect.right + halfMoreWidth,
                         rect.bottom + halfMoreHeight);
    }
 
    public static RectF contract(RectF rect, float lessWidth, float lessHeight) {
        float halfLessWidth = lessWidth / 2.0f;
        float halfLessHeight = lessHeight / 2.0f;
        return new RectF(rect.left + halfLessWidth,
                         rect.top + halfLessHeight,
                         rect.right - halfLessWidth,
                         rect.bottom - halfLessHeight);
    }
 
    public static RectF intersect(RectF one, RectF two) {
        float left = Math.max(one.left, two.left);
        float top = Math.max(one.top, two.top);
        float right = Math.min(one.right, two.right);
        float bottom = Math.min(one.bottom, two.bottom);
        return new RectF(left, top, Math.max(right, left), Math.max(bottom, top));
    }
 
    public static RectF scale(RectF rect, float scale) {
        float x = rect.left * scale;
        float y = rect.top * scale;
        return new RectF(x, y,
                         x + (rect.width() * scale),
                         y + (rect.height() * scale));
    }
 
    public static RectF inverseScale(RectF rect, float scale) {
        float x = rect.left / scale;
        float y = rect.top / scale;
        return new RectF(x, y,
                x + (rect.width() / scale),
                y + (rect.height() / scale));
    }
 
    public static Rect round(RectF rect) {
        Rect r = new Rect();
        round(rect, r);
        return r;
    }
 
    public static void round(RectF rect, Rect dest) {
        dest.set(Math.round(rect.left), Math.round(rect.top),
                 Math.round(rect.right), Math.round(rect.bottom));
    }
 
    public static Rect roundIn(RectF rect) {
        return new Rect((int)Math.ceil(rect.left), (int)Math.ceil(rect.top),
                        (int)Math.floor(rect.right), (int)Math.floor(rect.bottom));
    }
 
    public static IntSize getSize(Rect rect) {
        return new IntSize(rect.width(), rect.height());
    }
 
    public static Point getOrigin(Rect rect) {
        return new Point(rect.left, rect.top);
    }
 
    public static PointF getOrigin(RectF rect) {
        return new PointF(rect.left, rect.top);
    }
 
    public static boolean fuzzyEquals(RectF a, RectF b) {
        if (a == null && b == null)
            return true;
        else
            return a != null && b != null
                && FloatUtils.fuzzyEquals(a.top, b.top)
                && FloatUtils.fuzzyEquals(a.left, b.left)
                && FloatUtils.fuzzyEquals(a.right, b.right)
                && FloatUtils.fuzzyEquals(a.bottom, b.bottom);
    }
 
    public static void assign(final RectF target, final RectF source)
    {
        target.left = source.left;
        target.top = source.top;
        target.right = source.right;
        target.bottom = source.bottom;
    }
}