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Add viewport support to camera (fixes #64)

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This commit is contained in:
Matthias Richter 2016-05-01 16:20:43 +02:00
parent edf115f19a
commit 40f0820d3c
1 changed files with 41 additions and 13 deletions
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54
camera.lua
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@ -102,45 +102,73 @@ function camera:zoomTo(zoom)
return self return self
end end
function camera:attach() function camera:attach(x,y,w,h, noclip)
local cx,cy = love.graphics.getWidth()/(2*self.scale), love.graphics.getHeight()/(2*self.scale) x,y = x or 0, y or 0
w,h = w or love.graphics.getWidth(), h or love.graphics.getHeight()
self._sx,self._sy,self._sw,self._sh = love.graphics.getScissor()
if not noclip then
love.graphics.setScissor(x,y,w,h)
end
local cx,cy = x+w/2, y+h/2
love.graphics.push() love.graphics.push()
love.graphics.scale(self.scale)
love.graphics.translate(cx, cy) love.graphics.translate(cx, cy)
love.graphics.scale(self.scale)
love.graphics.rotate(self.rot) love.graphics.rotate(self.rot)
love.graphics.translate(-self.x, -self.y) love.graphics.translate(-self.x, -self.y)
end end
function camera:detach() function camera:detach()
love.graphics.pop() love.graphics.pop()
love.graphics.setScissor(self._sx,self._sy,self._sw,self._sh)
end end
function camera:draw(func) function camera:draw(...)
self:attach() local x,y,w,h,noclip,func
local nargs = select("#", ...)
if nargs == 1 then
func = ...
elseif nargs == 5 then
x,y,w,h,func = ...
elseif nargs == 6 then
x,y,w,h,noclip,func = ...
else
error("Invalid arguments to camera:draw()")
end
self:attach(x,y,w,h,noclip)
func() func()
self:detach() self:detach()
end end
function camera:cameraCoords(x,y) -- world coordinates to camera coordinates
function camera:cameraCoords(x,y, ox,oy,w,h)
ox, oy = ox or 0, oy or 0
w,h = w or love.graphics.getWidth(), h or love.graphics.getHeight()
-- x,y = ((x,y) - (self.x, self.y)):rotated(self.rot) * self.scale + center -- x,y = ((x,y) - (self.x, self.y)):rotated(self.rot) * self.scale + center
local w,h = love.graphics.getWidth(), love.graphics.getHeight()
local c,s = cos(self.rot), sin(self.rot) local c,s = cos(self.rot), sin(self.rot)
x,y = x - self.x, y - self.y x,y = x - self.x, y - self.y
x,y = c*x - s*y, s*x + c*y x,y = c*x - s*y, s*x + c*y
return x*self.scale + w/2, y*self.scale + h/2 return x*self.scale + w/2 + ox, y*self.scale + h/2 + oy
end end
function camera:worldCoords(x,y) -- camera coordinates to world coordinates
function camera:worldCoords(x,y, ox,oy,w,h)
ox, oy = ox or 0, oy or 0
w,h = w or love.graphics.getWidth(), h or love.graphics.getHeight()
-- x,y = (((x,y) - center) / self.scale):rotated(-self.rot) + (self.x,self.y) -- x,y = (((x,y) - center) / self.scale):rotated(-self.rot) + (self.x,self.y)
local w,h = love.graphics.getWidth(), love.graphics.getHeight()
local c,s = cos(-self.rot), sin(-self.rot) local c,s = cos(-self.rot), sin(-self.rot)
x,y = (x - w/2) / self.scale, (y - h/2) / self.scale x,y = (x - w/2 - ox) / self.scale, (y - h/2 - oy) / self.scale
x,y = c*x - s*y, s*x + c*y x,y = c*x - s*y, s*x + c*y
return x+self.x, y+self.y return x+self.x, y+self.y
end end
function camera:mousePosition() function camera:mousePosition(ox,oy,w,h)
return self:worldCoords(love.mouse.getPosition()) local mx,my = love.mouse.getPosition()
return self:worldCoords(mx,my, ox,oy,w,h)
end end
-- camera scrolling utilities -- camera scrolling utilities