Android example source code file (OrientedBoundingBox.java)

This example Android source code file (OrientedBoundingBox.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, drawing, graphics, matrix, orientedboundingbox, paint, path, ui

The OrientedBoundingBox.java Android example source code

/*
 * Copyright (C) 2008-2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.gesture;

import android.graphics.Matrix;
import android.graphics.Path;

/**
 * An oriented bounding box
 */
public class OrientedBoundingBox {
    public final float squareness;

    public final float width;
    public final float height;

    public final float orientation; 

    public final float centerX;
    public final float centerY;

    OrientedBoundingBox(float angle, float cx, float cy, float w, float h) {
        orientation = angle;
        width = w;
        height = h;
        centerX = cx;
        centerY = cy;
        float ratio = w / h;
        if (ratio > 1) {
            squareness = 1 / ratio;
        } else {
            squareness = ratio;
        }
    }

    /**
     * Currently used for debugging purpose only.
     *
     * @hide
     */
    public Path toPath() {
        Path path = new Path();
        float[] point = new float[2];
        point[0] = -width / 2;
        point[1] = height / 2;
        Matrix matrix = new Matrix();
        matrix.setRotate(orientation);
        matrix.postTranslate(centerX, centerY);
        matrix.mapPoints(point);
        path.moveTo(point[0], point[1]);

        point[0] = -width / 2;
        point[1] = -height / 2;
        matrix.mapPoints(point);
        path.lineTo(point[0], point[1]);

        point[0] = width / 2;
        point[1] = -height / 2;
        matrix.mapPoints(point);
        path.lineTo(point[0], point[1]);

        point[0] = width / 2;
        point[1] = height / 2;
        matrix.mapPoints(point);
        path.lineTo(point[0], point[1]);

        path.close();

        return path;
    }
}