Android Open Source - android-augment-reality-framework Camera Model

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.jwetherell.augmented_reality.camera;
//from   ww w.  java  2s.  com
import com.jwetherell.augmented_reality.common.Vector;

/**
 * Represents the camera and it's view. It also allows a user to project a point
 * given this camera's view.
 * 
 * This file was adapted from Mixare <http://www.mixare.org/>
 * 
 * @author Daniele Gobbetti <info@mixare.org>
 * @author Justin Wetherell <phishman3579@gmail.com>
 */
public class CameraModel {

    private static final float[] tmp1 = new float[3];
    private static final float[] tmp2 = new float[3];

    private int width = 0;
    private int height = 0;
    private float viewAngle = 0F;
    private float distance = 0F;

    public static final float DEFAULT_VIEW_ANGLE = (float) Math.toRadians(45);

    public CameraModel(int width, int height) {
        this(width, height, true);
    }

    public CameraModel(int width, int height, boolean init) {
        set(width, height, init);
    }

    /**
     * Set this objects parameters. This should be used instead of creating new
     * objects.
     * 
     * @param width
     *            Width of the model.
     * @param height
     *            Height of the model.
     * @param init
     *            Should initialize the internal transform and lco objects.
     */
    public void set(int width, int height, boolean init) {
        this.width = width;
        this.height = height;
    }

    /**
     * Width of the camera view.
     * 
     * @return int representing the width of camera view.
     */
    public int getWidth() {
        return width;
    }

    /**
     * Height of the camera view.
     * 
     * @return int representing height of the camera view.
     */
    public int getHeight() {
        return height;
    }

    /**
     * Set the View Angle of the camera model.
     * 
     * @param viewAngle
     *            float representing the camera model.
     */
    public void setViewAngle(float viewAngle) {
        this.viewAngle = viewAngle;
        this.distance = (this.width / 2) / (float) Math.tan(viewAngle / 2);
    }

    /**
     * Set the View Angle of the camera model.
     * 
     * @param width
     *            Width of the camera model.
     * @param height
     *            Height of the camera model.
     * @param viewAngle
     *            float representing the camera model.
     */
    public void setViewAngle(int width, int height, float viewAngle) {
        this.viewAngle = viewAngle;
        this.distance = (width / 2) / (float) Math.tan(viewAngle / 2);
    }

    /**
     * Project point from the origin Vector to the projected Vector.
     * 
     * @param orgPoint
     *            Vector representing the origin.
     * @param prjPoint
     *            Vector representing the projected point.
     * @param addX
     *            Add X to the projected point.
     * @param addY
     *            Add Y to the projected point.
     */
    public void projectPoint(Vector orgPoint, Vector prjPoint, float addX, float addY) {
        orgPoint.get(tmp1);
        tmp2[0] = (distance * tmp1[0] / -tmp1[2]);
        tmp2[1] = (distance * tmp1[1] / -tmp1[2]);
        tmp2[2] = (tmp1[2]);
        tmp2[0] = (tmp2[0] + addX + width / 2);
        tmp2[1] = (-tmp2[1] + addY + height / 2);
        prjPoint.set(tmp2);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return "CAM(" + width + "," + height + "," + viewAngle + "," + distance + ")";
    }
}

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