ExampleHook

ExampleMod/Content/Items/Tools/ExampleHook.cs

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+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using Terraria;
+using Terraria.ID;
+using Terraria.ModLoader;
+using static Terraria.ModLoader.ModContent;
+
+namespace ExampleMod.Content.Items.Tools
+{
+	internal class ExampleHookItem : ModItem
+	{
+		public override void SetStaticDefaults() {
+			DisplayName.SetDefault("Example Hook");
+		}
+
+		public override void SetDefaults() {
+			// Copy values from the Amethyst Hook
+			item.CloneDefaults(ItemID.AmethystHook);
+			item.shootSpeed = 18f; // how quickly the hook is shot.
+			item.shoot = ProjectileType<ExampleHookProjectile>();
+		}
+	}
+
+	internal class ExampleHookProjectile : ModProjectile
+	{
+		public override void SetStaticDefaults() {
+			DisplayName.SetDefault("${ProjectileName.GemHookAmethyst}");
+		}
+
+		public override void SetDefaults() {
+			projectile.CloneDefaults(ProjectileID.GemHookAmethyst);
+		}
+
+		// Use this hook for hooks that can have multiple hooks mid-flight: Dual Hook, Web Slinger, Fish Hook, Static Hook, Lunar Hook
+		public override bool? CanUseGrapple(Player player) {
+			int hooksOut = 0;
+			for (int l = 0; l < 1000; l++) {
+				if (Main.projectile[l].active && Main.projectile[l].owner == Main.myPlayer && Main.projectile[l].type == projectile.type) {
+					hooksOut++;
+				}
+			}
+
+			return hooksOut <= 2;
+		}
+
+		// Return true if it is like: Hook, CandyCaneHook, BatHook, GemHooks
+		//public override bool? SingleGrappleHook(Player player)
+		//{
+		//	return true;
+		//}
+
+		// Use this to kill oldest hook. For hooks that kill the oldest when shot, not when the newest latches on: Like SkeletronHand
+		// You can also change the projectile like: Dual Hook, Lunar Hook
+		//public override void UseGrapple(Player player, ref int type)
+		//{
+		//	int hooksOut = 0;
+		//	int oldestHookIndex = -1;
+		//	int oldestHookTimeLeft = 100000;
+		//	for (int i = 0; i < 1000; i++)
+		//	{
+		//		if (Main.projectile[i].active && Main.projectile[i].owner == projectile.whoAmI && Main.projectile[i].type == projectile.type)
+		//		{
+		//			hooksOut++;
+		//			if (Main.projectile[i].timeLeft < oldestHookTimeLeft)
+		//			{
+		//				oldestHookIndex = i;
+		//				oldestHookTimeLeft = Main.projectile[i].timeLeft;
+		//			}
+		//		}
+		//	}
+		//	if (hooksOut > 1)
+		//	{
+		//		Main.projectile[oldestHookIndex].Kill();
+		//	}
+		//}
+
+		// Amethyst Hook is 300, Static Hook is 600
+		public override float GrappleRange() {
+			return 500f;
+		}
+
+		public override void NumGrappleHooks(Player player, ref int numHooks) {
+			numHooks = 2;
+		}
+
+		// default is 11, Lunar is 24
+		public override void GrappleRetreatSpeed(Player player, ref float speed) {
+			speed = 18f;
+		}
+
+		public override void GrapplePullSpeed(Player player, ref float speed) {
+			speed = 10;
+		}
+
+		private Texture2D chainTexture = GetTexture("ExampleMod/Content/Items/Tools/ExampleHookChain").Value;
+
+		public override bool PreDraw(SpriteBatch spriteBatch, Color lightColor) {
+			Vector2 playerCenter = Main.player[projectile.owner].MountedCenter;
+			Vector2 center = projectile.Center;
+			Vector2 distToProj = playerCenter - projectile.Center;
+			float projRotation = distToProj.ToRotation() - MathHelper.PiOver2;
+			float distance = distToProj.Length();
+			while (distance > 30f && !float.IsNaN(distance)) {
+				distToProj.Normalize(); //get unit vector
+				distToProj *= 24f; //speed = 24
+				center += distToProj; //update draw position
+				distToProj = playerCenter - center; //update distance
+				distance = distToProj.Length();
+				Color drawColor = lightColor;
+
+				//Draw chain
+				spriteBatch.Draw(chainTexture, new Vector2(center.X - Main.screenPosition.X, center.Y - Main.screenPosition.Y),
+					new Rectangle(0, 0, chainTexture.Width, chainTexture.Height), drawColor, projRotation,
+					chainTexture.Size() * 0.5f, 1f, SpriteEffects.None, 0f);
+			}
+
+			return true;
+		}
+	}
+}