library-mirrors/light_world.lua
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image shadows look correct again

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Tim Anema 2014-11-29 23:08:29 -05:00
parent 0a2da63f24
commit 012a5481e9
2 changed files with 30 additions and 53 deletions
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81
lib/body.lua
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@ -460,63 +460,20 @@ function body:drawMaterial()
end
end
function body:drawCalculatedShadow(light)
function body:drawShadow(light)
love.graphics.setColor(self.red, self.green, self.blue, self.alpha)
if self.shadowType == "rectangle" or self.shadowType == "polygon" then
return self:calculatePolyShadow(light)
self:drawPolyShadow(light)
elseif self.shadowType == "circle" then
return self:calculateCircleShadow(light)
self:drawCircleShadow(light)
elseif self.shadowType == "image" and self.img then
local length = 1.0
local shadowRotation = math.atan2((self.x) - light.x, (self.y + self.oy) - light.y)
self.shadowVert = {
{
math.sin(shadowRotation) * self.imgHeight * length,
(length * math.cos(shadowRotation) + 1.0) * self.imgHeight + (math.cos(shadowRotation) + 1.0) * self.shadowY,
0, 0,
self.red,
self.green,
self.blue,
self.alpha * self.fadeStrength * 255
},
{
self.imgWidth + math.sin(shadowRotation) * self.imgHeight * length,
(length * math.cos(shadowRotation) + 1.0) * self.imgHeight + (math.cos(shadowRotation) + 1.0) * self.shadowY,
1, 0,
self.red,
self.green,
self.blue,
self.alpha * self.fadeStrength * 255
},
{
self.imgWidth,
self.imgHeight + (math.cos(shadowRotation) + 1.0) * self.shadowY,
1, 1,
self.red,
self.green,
self.blue,
self.alpha * 255
},
{
0,
self.imgHeight + (math.cos(shadowRotation) + 1.0) * self.shadowY,
0, 1,
self.red,
self.green,
self.blue,
self.alpha * 255
}
}
love.graphics.setColor(self.red, self.green, self.blue, self.alpha)
self.shadowMesh:setVertices(self.shadowVert)
love.graphics.draw(self.shadowMesh, self.x - self.ox, self.y - self.oy, 0, s, s)
self:drawImageShadow(light)
end
end
--using shadow point calculations from this article
--http://web.cs.wpi.edu/~matt/courses/cs563/talks/shadow/shadow.html
function body:calculatePolyShadow(light)
function body:drawPolyShadow(light)
if self.castsNoShadow or (self.zheight - light.z) > 0 then
return nil
end
@ -565,14 +522,13 @@ function body:calculatePolyShadow(light)
end
end
if #curShadowGeometry >= 6 then
love.graphics.setColor(self.red, self.green, self.blue, self.alpha)
love.graphics.polygon("fill", unpack(curShadowGeometry))
end
end
--using shadow point calculations from this article
--http://web.cs.wpi.edu/~matt/courses/cs563/talks/shadow/shadow.html
function body:calculateCircleShadow(light)
function body:drawCircleShadow(light)
if self.castsNoShadow or (self.zheight - light.z) > 0 then
return nil
end
@ -608,7 +564,6 @@ function body:calculateCircleShadow(light)
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
love.graphics.setColor(self.red, self.green, self.blue, self.alpha)
love.graphics.polygon("fill", curShadowGeometry)
if distance1 <= self.radius then
@ -622,4 +577,26 @@ function body:calculateCircleShadow(light)
end
end
function body:drawImageShadow(light)
local height_diff = (light.z - self.zheight)
if height_diff <= 0.1 then -- prevent shadows from leaving thier person like peter pan.
height_diff = 0.1
end
local length = 1.0 / height_diff
local shadowRotation = math.atan2((self.x) - light.x, (self.y + self.oy) - light.y)
local shadowStartY = self.imgHeight + (math.cos(shadowRotation) + 1.0) * self.shadowY
local shadowX = math.sin(shadowRotation) * self.imgHeight * length
local shadowY = (length * math.cos(shadowRotation) + 1.0) * shadowStartY
self.shadowMesh:setVertices({
{shadowX, shadowY, 0, 0, self.red, self.green, self.blue, self.alpha},
{shadowX + self.imgWidth, shadowY, 1, 0, self.red, self.green, self.blue, self.alpha},
{self.imgWidth, shadowStartY, 1, 1, self.red, self.green, self.blue, self.alpha},
{0, shadowStartY, 0, 1, self.red, self.green, self.blue, self.alpha}
})
love.graphics.draw(self.shadowMesh, self.x - self.ox, self.y - self.oy, 0, s, s)
end
return body

2
lib/init.lua
View File

@ -137,7 +137,7 @@ function light_world:drawNormalShading(l,t,w,h,s)
self.shadowMap:clear()
util.drawto(self.shadowMap, l, t, s, function()
for k = 1, #self.body do
self.body[k]:drawCalculatedShadow(self.lights[i])
self.body[k]:drawShadow(self.lights[i])
end
end)
self.lights[i]:drawNormalShading(l,t,w,h,s, self.normalMap, self.shadowMap, self.normal2)