MineLittlePony/src/main/java/com/minelittlepony/model/components/PonyTail.java

package com.minelittlepony.model.components;

import com.minelittlepony.renderer.plane.PlaneRenderer;

import net.minecraft.client.model.ModelBase;
import net.minecraft.util.math.MathHelper;

import static com.minelittlepony.model.PonyModelConstants.*;

import com.minelittlepony.pony.data.TailLengths;

public class PonyTail extends PlaneRenderer {
    
    private final TailSegment[] segments = new TailSegment[4];
    
    private final ModelBase theModel;
    
    public PonyTail(ModelBase model) {
        super(model);
        theModel = model;
    }
    
    public void init(float yOffset, float stretch) {
        for (int i = 0; i < segments.length; i++) {
            addChild(segments[i] = new TailSegment(theModel, i, yOffset, stretch));
        }
    }

    public void swingZ(boolean rainboom, float move, float swing) {
        rotateAngleZ = rainboom ? 0 : MathHelper.cos(move * 0.8F) * 0.2F * swing;
    }

    public void swingX(float tick) {
        float sinTickFactor = MathHelper.sin(tick * 0.067F) * 0.05F;
        rotateAngleX += sinTickFactor;
    }
    
    public void rotateSneak() {
        setRotationPoint(TAIL_RP_X, TAIL_RP_Y, TAIL_RP_Z_SNEAK);
        rotateAngleX = -BODY_ROTATE_ANGLE_X_SNEAK + 0.1F;
    }

    public void render(TailLengths tail, float scale) {
        int tailStop = tail.ordinal();

        for (int i = 0; i < segments.length; i++) {
            segments[i].isHidden = i >= tailStop;
        }

        super.render(scale);
    }
    
    private class TailSegment extends PlaneRenderer {
        
        public TailSegment(ModelBase model, int index, float yOffset, float stretch) {
            super(model);
            
            this.offsetY = ((float)index)/4 + 0.063f;
            
            init(index, yOffset, stretch);
        }
        
        public void init(int index, float yOffset, float stretch) {
            int texX = (index % 2) * 4;
            
            if (index == 0) {
                setTextureOffset(32, 0).addTopPlane(-2, 0, 2, 4, 4, stretch);
            }
            
            setTextureOffset(36, texX).addEastPlane(2, 0, 2, 4, 4, stretch);
            addWestPlane(-2, 0, 2, 4, 4, stretch);
            setTextureOffset(32, texX).addBackPlane(-2, 0, 2, 4, 4, stretch);
            addFrontPlane(-2, 0, 6, 4, 4, stretch);
            setTextureOffset(32, 0).addBottomPlane(-2, 4, 2, 4, 4, stretch);
            
            setRotationPoint(TAIL_RP_X, TAIL_RP_Y + yOffset, TAIL_RP_Z);
        }
    }
}