library-mirrors/light_world.lua
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made circle shadow bodies use arc instead of circle, also optimized so they were not drawn if not neccessary

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Tim Anema 2014-11-28 16:56:05 -05:00
parent ac5b9afa16
commit 993e029a2f
4 changed files with 19 additions and 3 deletions
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15
lib/body.lua
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@ -636,7 +636,20 @@ function body:calculateCircleShadow(light)
local radius = math.sqrt(math.pow(curShadowGeometry[7] - curShadowGeometry[5], 2) + math.pow(curShadowGeometry[8]-curShadowGeometry[6], 2)) / 2
local cx, cy = (curShadowGeometry[5] + curShadowGeometry[7])/2, (curShadowGeometry[6] + curShadowGeometry[8])/2
curShadowGeometry.circle = {cx, cy, radius}
local angle1 = math.atan2(curShadowGeometry[6] - cy, curShadowGeometry[5] - cx)
local angle2 = math.atan2(curShadowGeometry[8] - cy, curShadowGeometry[7] - cx)
local distance1 = math.sqrt(math.pow(light.x - self.x, 2) + math.pow(light.y - self.y, 2)) / 2
local distance2 = math.sqrt(math.pow(light.x - cx, 2) + math.pow(light.y - cy, 2)) / 2
if distance1 <= self.radius then
curShadowGeometry.circle = {cx, cy, radius, 0, (math.pi * 2)}
elseif distance2 < light.range then -- dont draw circle if way off screen
if angle1 > angle2 then
curShadowGeometry.circle = {cx, cy, radius, angle1, angle2}
else
curShadowGeometry.circle = {cx, cy, radius, angle1 - math.pi, angle2 - math.pi}
end
end
curShadowGeometry.red = self.red
curShadowGeometry.green = self.green

2
lib/init.lua
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@ -1,7 +1,7 @@
--[[
The MIT License (MIT)
Copyright (c) 2014 Marcus Ihde
Copyright (c) 2014 Marcus Ihde, Tim Anema
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal

3
lib/light.lua
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@ -165,6 +165,9 @@ function light:drawShadow(l,t,w,h,s,bodies, canvas)
shadow_geometry[k].blue * (1.0 - shadow_geometry[k].alpha)
)
love.graphics.polygon("fill", unpack(shadow_geometry[k]))
if shadow_geometry[k].circle then
love.graphics.arc("fill", unpack(shadow_geometry[k].circle))
end
end
end

2
lib/stencils.lua
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@ -7,7 +7,7 @@ function stencils.shadow(geometry, bodies)
if geometry[i].alpha == 1.0 then
love.graphics.polygon("fill", unpack(geometry[i]))
if geometry[i].circle then
love.graphics.circle("fill", unpack(geometry[i].circle))
love.graphics.arc("fill", unpack(geometry[i].circle))
end
end
end