net.adam_keenan.voxel.hud.HUD.java Source code

Introduction

Here is the source code for net.adam_keenan.voxel.hud.HUD.java

Source

/*
 * Adam Keenan, 2013
 * 
 * This work is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License. To view a copy of this license, visit
 * http://creativecommons.org/licenses/by-sa/3.0/.
 */

package net.adam_keenan.voxel.hud;

import java.nio.FloatBuffer;

import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GL11;

public class HUD {

    private HUD() {

    }

    public static void drawCrosshairs() {

        float screenx = (float) Display.getWidth() / 2, screeny = (float) Display.getHeight() / 2;
        float x1, y1, x2, y2, width1 = 4, height1 = 20, width2 = height1, height2 = width1;
        x1 = screenx - width1 / 2;
        y1 = screeny - height1 / 2;
        x2 = screenx - width2 / 2;
        y2 = screeny - height2 / 2;

        FloatBuffer perspectiveProjectionMatrix;
        FloatBuffer orthographicProjectionMatrix;
        perspectiveProjectionMatrix = BufferUtils.createFloatBuffer(16);
        orthographicProjectionMatrix = BufferUtils.createFloatBuffer(16);
        GL11.glMatrixMode(GL11.GL_PROJECTION);
        GL11.glGetFloat(GL11.GL_PROJECTION_MATRIX, perspectiveProjectionMatrix);
        GL11.glLoadIdentity();
        GL11.glOrtho(0, Display.getWidth(), Display.getHeight(), 0, 1, -1);
        GL11.glGetFloat(GL11.GL_PROJECTION_MATRIX, orthographicProjectionMatrix);
        //      GL11.glLoadMatrix(perspectiveProjectionMatrix);

        GL11.glMatrixMode(GL11.GL_PROJECTION); // For text drawing
        GL11.glLoadMatrix(orthographicProjectionMatrix);
        GL11.glMatrixMode(GL11.GL_MODELVIEW);
        GL11.glPushMatrix();
        GL11.glPushAttrib(GL11.GL_ALL_ATTRIB_BITS);
        GL11.glLoadIdentity(); // Clears matrix

        GL11.glColor4f(0, 0, 0, .5f);
        GL11.glRectf(x1, y1, x1 + width1, y1 + height1);
        GL11.glRectf(x2, y2, x2 + (width2 - width1) / 2, y2 + height2);
        GL11.glRectf(x2 + (width2 + width1) / 2, y2, x2 + width2, y2 + height2);

        GL11.glPopMatrix();
        GL11.glPopAttrib();
        GL11.glMatrixMode(GL11.GL_PROJECTION);
        GL11.glLoadMatrix(perspectiveProjectionMatrix);
        GL11.glMatrixMode(GL11.GL_MODELVIEW);

    }

}