From 9874b3af433eb7b76ec9ce31700e15c5ede1d1fb Mon Sep 17 00:00:00 2001
From: semtexerror <github@robintempert.nl>
Date: Wed, 28 Feb 2018 18:28:18 -0500
Subject: [PATCH] cannon plugin: draw npc double hit spots

---
 .../client/plugins/cannon/CannonConfig.java   | 21 ++++++++
 .../client/plugins/cannon/CannonOverlay.java  | 48 +++++++++++++++++++
 2 files changed, 69 insertions(+)

diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonConfig.java b/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonConfig.java
index e07567616a..dede24adbe 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonConfig.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonConfig.java
@@ -24,6 +24,7 @@
  */
 package net.runelite.client.plugins.cannon;
 
+import java.awt.Color;
 import net.runelite.client.config.Config;
 import net.runelite.client.config.ConfigGroup;
 import net.runelite.client.config.ConfigItem;
@@ -54,4 +55,24 @@ public interface CannonConfig extends Config
 	{
 		return false;
 	}
+
+	@ConfigItem(
+		keyName = "showDoubleHitSpot",
+		name = "Show double hit spots",
+		description = "Configures whether to show the NPC double hit spot"
+	)
+	default boolean showDoubleHitSpot()
+	{
+		return false;
+	}
+
+	@ConfigItem(
+		keyName = "highlightDoubleHitColor",
+		name = "Color of double hit spots",
+		description = "Configures the highlight color of double hit spots"
+	)
+	default Color highlightDoubleHitColor()
+	{
+		return Color.RED;
+	}
 }
diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonOverlay.java b/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonOverlay.java
index f3402789ac..930c4c7995 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonOverlay.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonOverlay.java
@@ -24,16 +24,20 @@
  */
 package net.runelite.client.plugins.cannon;
 
+import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Graphics2D;
 import java.awt.Point;
+import java.awt.Polygon;
 import javax.inject.Inject;
 import net.runelite.api.Client;
 import net.runelite.api.Perspective;
+import static net.runelite.api.Perspective.LOCAL_TILE_SIZE;
 import net.runelite.api.widgets.Widget;
 import net.runelite.client.ui.overlay.Overlay;
 import net.runelite.client.ui.overlay.OverlayPosition;
 import net.runelite.client.ui.overlay.OverlayPriority;
+import net.runelite.client.ui.overlay.OverlayUtil;
 import net.runelite.client.ui.overlay.components.TextComponent;
 
 class CannonOverlay extends Overlay
@@ -93,6 +97,50 @@ class CannonOverlay extends Overlay
 			textComponent.render(graphics, parent);
 		}
 
+		if (config.showDoubleHitSpot())
+		{
+			Color color = config.highlightDoubleHitColor();
+			drawDoubleHitSpots(graphics, plugin.getCannon().getLocalLocation(), color);
+		}
+
 		return null;
 	}
+
+
+	/**
+	 * Draw the double hit spots on a 6 by 6 grid around the cannon
+	 * @param startTile The position of the cannon
+	 */
+	private void drawDoubleHitSpots(Graphics2D graphics, net.runelite.api.Point startTile, Color color)
+	{
+		for (int x = -3; x <= 3; x++)
+		{
+			for (int y = -3; y <= 3; y++)
+			{
+				if (y != 1 && x != 1 && y != -1 && x != -1)
+				{
+					continue;
+				}
+
+				//Ignore center square
+				if (y >= -1 && y <= 1 && x >= -1 && x <= 1)
+				{
+					continue;
+				}
+
+				int xPos = startTile.getX() - (x * LOCAL_TILE_SIZE);
+				int yPos = startTile.getY() - (y * LOCAL_TILE_SIZE);
+
+				net.runelite.api.Point marker = new net.runelite.api.Point(xPos, yPos);
+				Polygon poly = Perspective.getCanvasTilePoly(client, marker);
+
+				if (poly == null)
+				{
+					continue;
+				}
+
+				OverlayUtil.renderPolygon(graphics, poly, color);
+			}
+		}
+	}
 }
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