fr.fg.client.animation.LoopClassNameUpdater.java Source code

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Here is the source code for fr.fg.client.animation.LoopClassNameUpdater.java

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/*
Copyright 2010 Jeremie Gottero
    
This file is part of Fallen Galaxy.
    
Fallen Galaxy is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
Fallen Galaxy is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
    
You should have received a copy of the GNU Affero General Public License
along with Fallen Galaxy. If not, see <http://www.gnu.org/licenses/>.
*/

package fr.fg.client.animation;

import com.google.gwt.user.client.ui.Widget;

import fr.fg.client.openjwt.animation.TimerHandler;

public class LoopClassNameUpdater implements TimerHandler {
    // ------------------------------------------------------- CONSTANTES -- //

    private final static int MODE_TARGET = 1, MODE_LOOP = 2;

    // -------------------------------------------------------- ATTRIBUTS -- //

    private Widget widget;

    private int mode;

    private String classPrefix;

    private double currentClass;

    private double targetClass;

    private double minTargetClass;

    private double maxTargetClass;

    private double increment;

    // ---------------------------------------------------- CONSTRUCTEURS -- //

    public LoopClassNameUpdater(Widget widget, String classPrefix, double currentClass, double increment) {
        this.mode = MODE_TARGET;
        this.widget = widget;
        this.classPrefix = classPrefix;
        this.currentClass = currentClass;
        this.targetClass = currentClass;
        this.increment = increment;

        widget.addStyleName(classPrefix + (int) Math.floor(currentClass));
    }

    // --------------------------------------------------------- METHODES -- //

    public void setIncrement(double increment) {
        this.increment = increment;
    }

    public void setCurrentClass(double currentClass) {
        int startClass = (int) Math.floor(this.currentClass);
        this.currentClass = currentClass;
        int endClass = (int) Math.floor(currentClass);

        if (startClass != endClass) {
            widget.removeStyleName(classPrefix + startClass);
            widget.addStyleName(classPrefix + endClass);
        }
    }

    public void setTargetClass(double targetClass) {
        this.targetClass = targetClass;
        this.mode = MODE_TARGET;
    }

    public void loopTargetClass(double minTargetClass, double maxTargetClass) {
        this.minTargetClass = minTargetClass;
        this.maxTargetClass = maxTargetClass;
        this.targetClass = maxTargetClass;
        this.mode = MODE_LOOP;
    }

    public void update(int interpolation) {
        if (currentClass != targetClass) {
            double coef = interpolation / 1000.;
            int startClass = (int) Math.floor(currentClass);

            if (currentClass > targetClass) {
                currentClass -= increment * coef;
                if (currentClass < targetClass)
                    currentClass = targetClass;
            } else if (currentClass < targetClass) {
                currentClass += increment * coef;
                if (currentClass > targetClass)
                    currentClass = targetClass;
            }

            int endClass = (int) Math.floor(currentClass);

            if (startClass != endClass) {
                widget.removeStyleName(classPrefix + startClass);
                widget.addStyleName(classPrefix + endClass);
            }
        }

        switch (mode) {
        case MODE_LOOP:
            if (currentClass == targetClass)
                targetClass = targetClass == minTargetClass ? maxTargetClass : minTargetClass;
            break;
        }
    }

    public void destroy() {
        widget = null;
        classPrefix = null;
    }

    public boolean isFinished() {
        return false;
    }

    // ------------------------------------------------- METHODES PRIVEES -- //
}