NoiseSample.java

/*
 * The MIT License (MIT)
 *
 * FXGL - JavaFX Game Library
 *
 * Copyright (c) 2015-2017 AlmasB (almaslvl@gmail.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package sandbox;

import com.almasb.fxgl.app.ApplicationMode;
import com.almasb.fxgl.app.GameApplication;
import com.almasb.fxgl.core.math.FXGLMath;
import com.almasb.fxgl.core.math.Vec2;
import com.almasb.fxgl.ecs.Entity;
import com.almasb.fxgl.entity.Entities;
import com.almasb.fxgl.entity.component.PositionComponent;
import com.almasb.fxgl.entity.control.KeepOnScreenControl;
import com.almasb.fxgl.entity.control.RandomMoveControl;
import com.almasb.fxgl.settings.GameSettings;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;

/**
 * This is an example of a minimalistic FXGL game application.
 *
 * @author Almas Baimagambetov (AlmasB) (almaslvl@gmail.com)
 */
public class NoiseSample extends GameApplication {

    @Override
    protected void initSettings(GameSettings settings) {
        settings.setWidth(800);
        settings.setHeight(600);
        settings.setTitle("NoiseSample");
        settings.setVersion("0.1");
        settings.setIntroEnabled(false);
        settings.setMenuEnabled(false);
        settings.setCloseConfirmation(false);
    }

    private Rectangle rect;

    @Override
    protected void initGame() {
        Entities.builder()
                .at(100, 100)
                .viewFromNodeWithBBox(new Rectangle(40, 40))
                .with(new RandomMoveControl(100), new KeepOnScreenControl(true, true))
                .buildAndAttach(getGameWorld());
    }

    float t = 0;

    @Override
    protected void onUpdate(double tpf) {
//        float n = noise1D(t);
//        n += 0.5f;
//
//        // flickering rect
//        rect.setFill(Color.color(n, n, n));
//
//        n -= 0.5f;
//
//        float x = getWidth() * n;
//
//        //rect.setTranslateX(400 + x);
//
//        t += tpf;
    }

    // from CRYtek
    public static final int NOISE_TABLE_SIZE = 256;
    public static final int NOISE_MASK = 255;

    private float[] gx = new float[NOISE_TABLE_SIZE];
    private float[] gy = new float[NOISE_TABLE_SIZE];

    void setSeedAndReinitialize() {
        // Generate the gradient lookup tables
        for (int i = 0; i < NOISE_TABLE_SIZE; i++) {
            // Ken Perlin proposes that the gradients are taken from the unit
            // circle/sphere for 2D/3D.
            // So lets generate a good pseudo-random vector and normalize it

            Vec2 v = new Vec2();
            // cry_frand is in the 0..1 range
            v.x = -0.5f + FXGLMath.random();
            v.y = -0.5f + FXGLMath.random();
            v.normalizeLocal();

            gx[i] = v.x;
            gy[i] = v.y;
        }
    }

    // (-0.5, 0.5) t > 0
    private float noise1D(float x) {
        // Compute what gradients to use
        int qx0 = (int)Math.floor(x);
        int qx1 = qx0 + 1;
        float tx0 = x - (float)qx0;
        float tx1 = tx0 - 1;

        // Make sure we don't come outside the lookup table
        qx0 = qx0 & NOISE_MASK;
        qx1 = qx1 & NOISE_MASK;

        // Compute the dotproduct between the vectors and the gradients
        float v0 = gx[qx0] * tx0;
        float v1 = gx[qx1] * tx1;

        // Modulate with the weight function
        float wx = (3 - 2 * tx0) * tx0 * tx0;
        float v = v0 - wx * (v0 - v1);

        return v;
    }

    public static void main(String[] args) {
        launch(args);
    }
}