game.graphics.GUI_Button.java Source code

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Here is the source code for game.graphics.GUI_Button.java

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/*******************************************************************************
 * Copyright (c) 2013 Glynn Taylor.
 * All rights reserved. This program and the accompanying materials, 
 * (excluding imported libraries, such as LWJGL and Slick2D)
 * are made available under the terms of the GNU Public License
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Glynn Taylor - initial API and implementation
 ******************************************************************************/
/*Acts as an on screen button (generic), can be set-up with
 different textures, registers mouse clicks if updated.
 */
package game.graphics;

import game.states.Game;

import org.lwjgl.opengl.GL11;
import org.newdawn.slick.opengl.Texture;

public class GUI_Button {
    int ScreenWidth, ScreenHeight;
    int ScreenX, ScreenY, ScreenButtonWidth, ScreenButtonHeight;
    Texture texture;
    private final float MouseOverMultiplier = 1.1f;
    private boolean MouseInsideMe;

    public void Render() {
        texture.bind();
        GL11.glBegin(GL11.GL_QUADS);

        GL11.glTexCoord2f(0, 0);
        GL11.glVertex3f(ScreenX, ScreenY, 0);

        GL11.glTexCoord2f(0, 1);
        GL11.glVertex3f(ScreenX, ScreenY + ScreenButtonHeight * (MouseInsideMe ? MouseOverMultiplier : 1), 0);

        GL11.glTexCoord2f(1, 1);
        GL11.glVertex3f(ScreenX + ScreenButtonWidth * (MouseInsideMe ? MouseOverMultiplier : 1),
                ScreenY + ScreenButtonHeight * (MouseInsideMe ? MouseOverMultiplier : 1), 0);

        GL11.glTexCoord2f(1, 0);
        GL11.glVertex3f(ScreenX + ScreenButtonWidth * (MouseInsideMe ? MouseOverMultiplier : 1), ScreenY, 0);

        GL11.glEnd();

    }

    public GUI_Button(int startX, int startY, int width, int height, Texture t) {

        int gameWidth = Game.Width;
        int gameHeight = Game.Height;
        ScreenX = startX;
        ScreenY = startY;
        ScreenButtonWidth = width;
        ScreenButtonHeight = height;

        ScreenWidth = gameWidth;
        ScreenHeight = gameHeight;
        texture = t;

    }

    public int NextPowerOf2(int num) {
        int returnNumber = 1;
        while (returnNumber < num) {
            returnNumber *= 2;
        }
        return returnNumber;

    }

    public boolean InsideButton(int mouseX, int mouseY) {
        if (mouseX > ScreenX && mouseX < ScreenX + ScreenButtonWidth) {
            if (ScreenHeight - mouseY > ScreenY && ScreenHeight - mouseY < ScreenY + ScreenButtonHeight) {
                MouseInsideMe = true;
                return true;
            }

        }
        MouseInsideMe = false;
        return false;
    }
}