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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.tabs;
import android.graphics.Path;
/**
* Utility methods to draws Firefox's tab curve shape.
*/
public class TabCurve {
public enum Direction {
LEFT(-1),
RIGHT(1);
private final int value;
private Direction(int value) {
this.value = value;
}
}
// Curve's aspect ratio
private static final float ASPECT_RATIO = 0.729f;
// Width multipliers
private static final float W_M1 = 0.343f;
private static final float W_M2 = 0.514f;
private static final float W_M3 = 0.49f;
private static final float W_M4 = 0.545f;
private static final float W_M5 = 0.723f;
// Height multipliers
private static final float H_M1 = 0.25f;
private static final float H_M2 = 0.5f;
private static final float H_M3 = 0.72f;
private static final float H_M4 = 0.961f;
private TabCurve() {
}
public static float getWidthForHeight(float height) {
return (int) (height * ASPECT_RATIO);
}
public static void drawFromTop(Path path, float from, float height, Direction dir) {
final float width = getWidthForHeight(height);
path.cubicTo(from + width * W_M1 * dir.value, 0.0f,
from + width * W_M3 * dir.value, height * H_M1,
from + width * W_M2 * dir.value, height * H_M2);
path.cubicTo(from + width * W_M4 * dir.value, height * H_M3,
from + width * W_M5 * dir.value, height * H_M4,
from + width * dir.value, height);
}
public static void drawFromBottom(Path path, float from, float height, Direction dir) {
final float width = getWidthForHeight(height);
path.cubicTo(from + width * (1f - W_M5) * dir.value, height * H_M4,
from + width * (1f - W_M4) * dir.value, height * H_M3,
from + width * (1f - W_M2) * dir.value, height * H_M2);
path.cubicTo(from + width * (1f - W_M3) * dir.value, height * H_M1,
from + width * (1f - W_M1) * dir.value, 0.0f,
from + width * dir.value, 0.0f);
}
}
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