com.ridiculousRPG.ui.DisplayFPSService.java Source code

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Here is the source code for com.ridiculousRPG.ui.DisplayFPSService.java

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/*
 * Copyright 2011 Alexander Baumgartner
 *
 * 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 com.ridiculousRPG.ui;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Camera;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.g2d.BitmapFontCache;
import com.badlogic.gdx.math.Matrix4;
import com.ridiculousRPG.service.Computable;

/**
 * Displays the frame rate per second at one corner of the screen.
 * 
 * @author Alexander Baumgartner
 */
public class DisplayFPSService extends DisplayPlainTextService implements Computable {
    private float colorBits;
    private Alignment horiAlign, vertAlign;
    private int oldFPS;
    private BitmapFontCache fontCache;

    /**
     * Displays the rendering speed in frames per second.
     */
    public DisplayFPSService() {
        this(Color.WHITE, Alignment.LEFT, Alignment.TOP);
    }

    /**
     * Displays the rendering speed in frames per second.
     * 
     * @param font
     *            The font will automatically be disposed when disposing this
     *            service.
     * @param alignRight
     *            If true the text will be aligned right.
     * @param valignBottom
     *            If true the text will be displayed at the bottom of the
     *            screen.
     */
    public DisplayFPSService(Color color, Alignment horiAlign, Alignment vertAlign) {
        this.colorBits = color.toFloatBits();
        this.horiAlign = horiAlign;
        this.vertAlign = vertAlign;
    }

    public void compute(float deltaTime, boolean actionKeyDown) {
        if (oldFPS != Gdx.graphics.getFramesPerSecond()) {
            oldFPS = Gdx.graphics.getFramesPerSecond();
            if (fontCache != null)
                removeMessage(fontCache);
            fontCache = addMessage("FPS: " + oldFPS, colorBits, horiAlign, vertAlign, 5f);
        }
    }

    public Matrix4 projectionMatrix(Camera camera) {
        return camera.view;
    }
}