From 38ecbee541053edde6f9161038f2abe0be55cbf5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juhani=20Krekel=C3=A4?= <juhani@krekelä.fi>
Date: Fri, 2 Jun 2023 17:21:52 +0300
Subject: [PATCH] Have explosions destroy things

---
 bundle/main.lua | 43 +++++++++++++++++++++++++++++++++++--------
 1 file changed, 35 insertions(+), 8 deletions(-)

diff --git a/bundle/main.lua b/bundle/main.lua
index fbe2216..99333b6 100644
--- a/bundle/main.lua
+++ b/bundle/main.lua
@@ -98,6 +98,7 @@ function spawnExplosion(x, y)
 	table.insert(explosions, {
 		x = x,
 		y = y,
+		radius = 0,
 		remaining = explosion_duration,
 	})
 end
@@ -145,10 +146,9 @@ function updateMissiles(dt)
 			local distance = math.sqrt(dx * dx + dy * dy)
 			if city.alive and distance < city_radius then
 				spawnExplosion(missile.x, missile.y)
-				-- Destroy city
-				city.alive = false
-				-- Destroy missile
-				missile.alive = false
+				-- Freeze the missile in-place
+				missile.dx = 0
+				missile.dy = 0
 			end
 		end
 
@@ -178,8 +178,36 @@ end
 function updateExplosions(dt)
 	local i = 1
 	while i <= #explosions do
-		explosions[i].remaining = explosions[i].remaining - dt
-		if explosions[i].remaining < 0 then
+		local explosion = explosions[i]
+
+		local completeness = (explosion_duration - explosion.remaining) / explosion_duration
+		explosion.radius = completeness ^ 1.5 * explosion_radius
+
+		-- Destroy missiles within range
+		for _, missile in ipairs(missiles) do
+			local dx = missile.x - explosion.x
+			local dy = missile.x - explosion.x
+			local distance = math.sqrt(dx * dx + dy * dy)
+			if distance < explosion.radius then
+				missile.alive = false
+			end
+		end
+
+		explosion.remaining = explosion.remaining - dt
+
+		if explosion.remaining < explosion_duration * 0.2 then
+			-- Destroy cities within range
+			for _, city in ipairs(cities) do
+				local dx = city.x - explosion.x
+				local dy = city.x - explosion.x
+				local distance = math.sqrt(dx * dx + dy * dy)
+				if distance < explosion.radius + city_radius then
+					city.alive = false
+				end
+			end
+		end
+
+		if explosion.remaining < 0 then
 			table.remove(explosions, i)
 		else
 			i = i + 1
@@ -273,10 +301,9 @@ end
 
 function drawExplosions()
 	for _, explosion in ipairs(explosions) do
-		local completeness = (explosion_duration - explosion.remaining) / explosion_duration
 		love.graphics.setColor(1, 0, 0)
 		local x, y = toScreenCoordinates(explosion.x, explosion.y)
-		local radius = toScreenSize(completeness ^ 1.5 * explosion_radius)
+		local radius = toScreenSize(explosion.radius)
 		love.graphics.circle('fill', x, y, radius)
 	end
 end