com.tussle.collision.CollisionEdge.java Source code

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Here is the source code for com.tussle.collision.CollisionEdge.java

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/*
 * Copyright (c) 2018 eaglgenes101
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.tussle.collision;

import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.tussle.main.Intersector;
import org.apache.commons.math3.util.FastMath;

public class CollisionEdge implements CollisionShape {
    protected double startx;
    protected double starty;
    protected double endx;
    protected double endy;

    public CollisionEdge(double sx, double sy, double ex, double ey) {
        startx = sx;
        starty = sy;
        endx = ex;
        endy = ey;
    }

    public ProjectionVector depth(CollisionStadium stad) {
        ProjectionVector disp = Intersector.displacementSegments(startx, starty, endx, endy, stad.getStartx(),
                stad.getStarty(), stad.getEndx(), stad.getEndy());
        disp.xnorm = -disp.xnorm;
        disp.ynorm = -disp.ynorm;
        disp.magnitude = stad.getRadius() - disp.magnitude;
        return disp;
    }

    public double[] nearestPoint(CollisionStadium stad) {
        double section = Intersector.partSegments(startx, starty, endx, endy, stad.getStartx(), stad.getStarty(),
                stad.getEndx(), stad.getEndy());
        return new double[] { (1 - section) * startx + section * endx, (1 - section) * starty + section * endy };
    }

    public double stadiumPortion(CollisionStadium stad) {
        return Intersector.partSegments(stad.getStartx(), stad.getStarty(), stad.getEndx(), stad.getEndy(), startx,
                starty, endx, endy);
    }

    public boolean collidesWith(CollisionStadium stad) {
        double section = Intersector.partSegments(startx, starty, endx, endy, stad.getStartx(), stad.getStarty(),
                stad.getEndx(), stad.getEndy());
        ProjectionVector disp = depth(stad);
        return section > 0 && section < 1 && disp.xNorm() * (starty - endy) + disp.yNorm() * (endx - startx) > 0
                && disp.magnitude <= 16;
    }

    public Rectangle getBounds() {
        double minX = FastMath.min(startx, endx);
        double maxX = FastMath.max(startx, endx);
        double minY = FastMath.min(starty, endy);
        double maxY = FastMath.max(starty, endy);
        return new Rectangle(minX, minY, maxX - minX, maxY - minY);
    }

    public void draw(ShapeRenderer drawer) {

        double len = FastMath.hypot(endx - startx, endy - starty);
        if (len > 0) {
            double dx = (starty - endy) * 10 / len;
            double dy = (endx - startx) * 10 / len;
            drawer.line((float) startx, (float) starty, (float) endx, (float) endy);
            drawer.line((float) startx, (float) starty, (float) (startx - dx), (float) (starty - dy));
            drawer.line((float) endx, (float) endy, (float) (endx - dx), (float) (endy - dy));
        } else
            drawer.point((float) startx, (float) starty, 0);
    }

    public CollisionEdge displacementBy(double dx, double dy) {
        return new CollisionEdge(startx + dx, starty + dy, endx + dx, endy + dy);
    }

    public CollisionEdge interpolate(CollisionShape other) {
        if (!(other instanceof CollisionEdge))
            throw new IllegalArgumentException();
        CollisionEdge o = (CollisionEdge) other;
        return new CollisionEdge((startx + o.startx) / 2, (starty + o.starty) / 2, (endx + o.endx) / 2,
                (endy + o.endy) / 2);
    }

    public CollisionEdge transformBy(double dx, double dy, double rot, double scale, boolean flip) {
        double sx = (flip ? endx : startx) * (flip ? -scale : scale);
        double sy = (flip ? endy : starty) * scale;
        double ex = (flip ? startx : endx) * (flip ? -scale : scale);
        double ey = (flip ? starty : endy) * scale;
        double cos = FastMath.cos(FastMath.toRadians(rot));
        double sin = FastMath.sin(FastMath.toRadians(rot));
        return new CollisionEdge(sx * cos - sy * sin + dx, sx * sin + sy * cos + dy, ex * cos - ey * sin + dx,
                ex * sin + ey * cos + dy);
    }
}