minecraft-src/net/minecraft/client/particle/FlyTowardsPositionParticle.java

package net.minecraft.client.particle;

import com.mojang.blaze3d.vertex.VertexConsumer;
import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.minecraft.client.Camera;
import net.minecraft.client.multiplayer.ClientLevel;
import net.minecraft.core.particles.SimpleParticleType;

@Environment(EnvType.CLIENT)
public class FlyTowardsPositionParticle extends TextureSheetParticle {
	private final double xStart;
	private final double yStart;
	private final double zStart;
	private final boolean isGlowing;
	private final Particle.LifetimeAlpha lifetimeAlpha;

	FlyTowardsPositionParticle(ClientLevel level, double x, double y, double z, double xSpeed, double ySpeed, double zSpeed) {
		this(level, x, y, z, xSpeed, ySpeed, zSpeed, false, Particle.LifetimeAlpha.ALWAYS_OPAQUE);
	}

	FlyTowardsPositionParticle(
		ClientLevel level, double x, double y, double z, double xSpeed, double ySpeed, double zSpeed, boolean isGlowing, Particle.LifetimeAlpha lifetimeAlpha
	) {
		super(level, x, y, z);
		this.isGlowing = isGlowing;
		this.lifetimeAlpha = lifetimeAlpha;
		this.setAlpha(lifetimeAlpha.startAlpha());
		this.xd = xSpeed;
		this.yd = ySpeed;
		this.zd = zSpeed;
		this.xStart = x;
		this.yStart = y;
		this.zStart = z;
		this.xo = x + xSpeed;
		this.yo = y + ySpeed;
		this.zo = z + zSpeed;
		this.x = this.xo;
		this.y = this.yo;
		this.z = this.zo;
		this.quadSize = 0.1F * (this.random.nextFloat() * 0.5F + 0.2F);
		float f = this.random.nextFloat() * 0.6F + 0.4F;
		this.rCol = 0.9F * f;
		this.gCol = 0.9F * f;
		this.bCol = f;
		this.hasPhysics = false;
		this.lifetime = (int)(Math.random() * 10.0) + 30;
	}

	@Override
	public ParticleRenderType getRenderType() {
		return this.lifetimeAlpha.isOpaque() ? ParticleRenderType.PARTICLE_SHEET_OPAQUE : ParticleRenderType.PARTICLE_SHEET_TRANSLUCENT;
	}

	@Override
	public void move(double x, double y, double z) {
		this.setBoundingBox(this.getBoundingBox().move(x, y, z));
		this.setLocationFromBoundingbox();
	}

	@Override
	public int getLightColor(float partialTick) {
		if (this.isGlowing) {
			return 240;
		} else {
			int i = super.getLightColor(partialTick);
			float f = (float)this.age / this.lifetime;
			f *= f;
			f *= f;
			int j = i & 0xFF;
			int k = i >> 16 & 0xFF;
			k += (int)(f * 15.0F * 16.0F);
			if (k > 240) {
				k = 240;
			}

			return j | k << 16;
		}
	}

	@Override
	public void tick() {
		this.xo = this.x;
		this.yo = this.y;
		this.zo = this.z;
		if (this.age++ >= this.lifetime) {
			this.remove();
		} else {
			float f = (float)this.age / this.lifetime;
			f = 1.0F - f;
			float g = 1.0F - f;
			g *= g;
			g *= g;
			this.x = this.xStart + this.xd * f;
			this.y = this.yStart + this.yd * f - g * 1.2F;
			this.z = this.zStart + this.zd * f;
		}
	}

	@Override
	public void render(VertexConsumer buffer, Camera camera, float partialTick) {
		this.setAlpha(this.lifetimeAlpha.currentAlphaForAge(this.age, this.lifetime, partialTick));
		super.render(buffer, camera, partialTick);
	}

	@Environment(EnvType.CLIENT)
	public static class EnchantProvider implements ParticleProvider<SimpleParticleType> {
		private final SpriteSet sprite;

		public EnchantProvider(SpriteSet sprite) {
			this.sprite = sprite;
		}

		public Particle createParticle(SimpleParticleType type, ClientLevel level, double x, double y, double z, double xSpeed, double ySpeed, double zSpeed) {
			FlyTowardsPositionParticle flyTowardsPositionParticle = new FlyTowardsPositionParticle(level, x, y, z, xSpeed, ySpeed, zSpeed);
			flyTowardsPositionParticle.pickSprite(this.sprite);
			return flyTowardsPositionParticle;
		}
	}

	@Environment(EnvType.CLIENT)
	public static class NautilusProvider implements ParticleProvider<SimpleParticleType> {
		private final SpriteSet sprite;

		public NautilusProvider(SpriteSet sprite) {
			this.sprite = sprite;
		}

		public Particle createParticle(SimpleParticleType type, ClientLevel level, double x, double y, double z, double xSpeed, double ySpeed, double zSpeed) {
			FlyTowardsPositionParticle flyTowardsPositionParticle = new FlyTowardsPositionParticle(level, x, y, z, xSpeed, ySpeed, zSpeed);
			flyTowardsPositionParticle.pickSprite(this.sprite);
			return flyTowardsPositionParticle;
		}
	}

	@Environment(EnvType.CLIENT)
	public static class VaultConnectionProvider implements ParticleProvider<SimpleParticleType> {
		private final SpriteSet sprite;

		public VaultConnectionProvider(SpriteSet sprite) {
			this.sprite = sprite;
		}

		public Particle createParticle(SimpleParticleType type, ClientLevel level, double x, double y, double z, double xSpeed, double ySpeed, double zSpeed) {
			FlyTowardsPositionParticle flyTowardsPositionParticle = new FlyTowardsPositionParticle(
				level, x, y, z, xSpeed, ySpeed, zSpeed, true, new Particle.LifetimeAlpha(0.0F, 0.6F, 0.25F, 1.0F)
			);
			flyTowardsPositionParticle.scale(1.5F);
			flyTowardsPositionParticle.pickSprite(this.sprite);
			return flyTowardsPositionParticle;
		}
	}
}