From dc86672f5a8a8d15b7d457b9376151bce31a5085 Mon Sep 17 00:00:00 2001
From: Logen Kain <logen@sudotask.com>
Date: Sun, 27 Nov 2016 14:34:01 -0700
Subject: [PATCH] love: added square grid example;added hex example

---
 love/from_forums/draw_hex_example/main.lua    | 20 +++++
 love/from_forums/square_grid_example/main.lua | 81 +++++++++++++++++++
 2 files changed, 101 insertions(+)
 create mode 100644 love/from_forums/draw_hex_example/main.lua
 create mode 100644 love/from_forums/square_grid_example/main.lua

diff --git a/love/from_forums/draw_hex_example/main.lua b/love/from_forums/draw_hex_example/main.lua
new file mode 100644
index 0000000..ede8b52
--- /dev/null
+++ b/love/from_forums/draw_hex_example/main.lua
@@ -0,0 +1,20 @@
+
+hex = {}
+hex.centerX = 200
+hex.centerY = 200
+hex.size = 45
+function love.draw()
+	love.graphics.setColor({255,255,255})
+	local lastX = nil
+	local lastY = nil
+	for i=0,6 do
+		local angle = 2 * math.pi / 6 * (i + 0.5)
+		local x = hex.centerX + hex.size * math.cos(angle)
+		local y = hex.centerY + hex.size * math.sin(angle)
+		if i > 0 then
+			love.graphics.line(lastX, lastY, x, y)
+		end
+		lastX = x
+		lastY = y
+	end
+end
diff --git a/love/from_forums/square_grid_example/main.lua b/love/from_forums/square_grid_example/main.lua
new file mode 100644
index 0000000..206f156
--- /dev/null
+++ b/love/from_forums/square_grid_example/main.lua
@@ -0,0 +1,81 @@
+local camera = {0, 0}
+local screen = {800,600}
+local squares = nil
+local squaresize = 50
+local maxx, maxy = 100, 100
+--love.window.setMode( 1024, 768 )
+function love.load()
+   -- build the map
+   squares = {}
+   for y = 1, maxy do
+      local row = {}
+      for x = 1, maxx do
+         local sq = {set = false}
+         table.insert(row, sq)
+      end
+      table.insert(squares, row)
+   end
+   screen[1] = love.graphics.getWidth()
+   screen[2] = love.graphics.getHeight()
+end
+
+function love.draw()
+   -- draw the currently visible portion of the map
+   -- this draws every partially visible square and relies
+   -- on love drawing code to clip the edges
+   local camx, camy = unpack(camera)
+   local scrx, scry = unpack(screen)
+	 
+	 --Prevent camera from going off screen
+	 local vleft = math.floor(camx/squaresize)
+   local vup = math.floor(camy/squaresize)
+	 
+	 
+	 local horc = math.ceil(scrx/squaresize) + 1
+   local verc = math.ceil(scry/squaresize) + 1
+
+	 -- Until the number of vertical squares
+	 for y = 1, verc do
+		 -- Until the number of horizontal squares
+      for x = 1, horc do
+         if squares[vup+y] and squares[vup+y][vleft+x] then
+            local mode = "line"
+            if squares[vup+y][vleft+x].set then
+               mode = "fill"
+            end
+            love.graphics.rectangle(mode, (vleft+x-1)*squaresize - camx,
+               (vup+y-1)*squaresize - camy, squaresize, squaresize)
+         end
+      end
+   end
+end
+
+local scrollspeed = 200
+local edge = 100
+
+function love.update(dt)
+   -- scroll the screen if mouse is near edges
+   local scrx, scry = unpack(screen)
+   local mx, my = love.mouse.getPosition()
+   if mx < edge/2 then camera[1] = camera[1] - scrollspeed * dt end
+   if mx > scrx - edge/2 then camera[1] = camera[1] + scrollspeed * dt end
+   if my < edge/2 then camera[2] = camera[2] - scrollspeed * dt end
+   if my > scry - edge/2 then camera[2] = camera[2] + scrollspeed * dt end
+   -- limit the camera position from wandering off
+   if camera[1] < -edge then camera[1] = -edge end
+   if camera[2] < -edge then camera[2] = -edge end
+   local xlimit, ylimit = maxx*squaresize + edge - scrx, maxy*squaresize + edge - scry
+   if camera[1] > xlimit then camera[1] = xlimit end
+   if camera[2] > ylimit then camera[2] = ylimit end
+end
+
+function love.mousepressed(x, y, button)
+   -- toggle the clicked square on left button click
+   if button ~= 'l' then return end
+   local wx, wy = x + camera[1], y + camera[2]
+   local x, y = math.floor(wx/squaresize)+1, math.floor(wy/squaresize)+1
+   if squares[y] and squares[y][x] then
+      local value = squares[y][x].set
+      squares[y][x].set = not value -- toggle bool flag
+   end
+end