CodeChickenCore/codechicken/lib/vec/Scale.java

package codechicken.lib.vec;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import org.lwjgl.opengl.GL11;

import java.math.BigDecimal;
import java.math.MathContext;
import java.math.RoundingMode;

public class Scale extends Transformation {
    public Vector3 factor;

    public Scale(Vector3 factor) {
        this.factor = factor;
    }

    public Scale(double factor) {
        this(new Vector3(factor, factor, factor));
    }

    public Scale(double x, double y, double z) {
        this(new Vector3(x, y, z));
    }

    @Override
    public void apply(Vector3 vec) {
        vec.multiply(factor);
    }

    @Override
    public void applyN(Vector3 normal) {
    }

    @Override
    public void apply(Matrix4 mat) {
        mat.scale(factor);
    }

    @Override
    @SideOnly(Side.CLIENT)
    public void glApply() {
        GL11.glScaled(factor.x, factor.y, factor.z);
    }

    @Override
    public Transformation inverse() {
        return new Scale(1 / factor.x, 1 / factor.y, 1 / factor.z);
    }

    @Override
    public Transformation merge(Transformation next) {
        if (next instanceof Scale)
            return new Scale(factor.copy().multiply(((Scale) next).factor));

        return null;
    }

    @Override
    public boolean isRedundant() {
        return factor.equalsT(Vector3.one);
    }

    @Override
    public String toString() {
        MathContext cont = new MathContext(4, RoundingMode.HALF_UP);
        return "Scale(" + new BigDecimal(factor.x, cont) + ", " + new BigDecimal(factor.y, cont) + ", " + new BigDecimal(factor.z, cont) + ")";
    }
}