dcearth/ui/camera.lua

73 lines
1.8 KiB
Lua

local tf = love.math.newTransform()
local tfTerritory = love.math.newTransform()
local tfNodes = love.math.newTransform()
local lg = assert( love.graphics )
local Camera = {
x = 0, y = 70,
w = 360, h = 200,
zoom = 1, tf = tf,
tfTerritory = tfTerritory, tfNodes = tfNodes }
function Camera.GetWorldCoordinate( x, y )
return tf:inverseTransformPoint( x, y )
end
function Camera.GetBitmapCoordinate( x, y )
return tfTerritory:inverseTransformPoint( x, y )
end
function Camera.GetNodeCoordinate( x, y )
return tfNodes:inverseTransformPoint( x, y )
end
function Camera.Zoom( delta )
if Camera.zoom < 25.0 and delta > 0 or --zooming in
Camera.zoom > 0.5 and delta < 0 then --zooming out
delta = delta * Camera.zoom
local cx, cy = Camera.x, Camera.y
return Camera.Set(
cx,
cy,
Camera.w + delta,
Camera.h * (Camera.w + delta) / Camera.w )
end
end
function Camera.Translate( x, y )
x = x or 0
y = y or 0
return Camera.Set(
math.max(-360, math.min(360, Camera.x + x)),
math.max(-140, math.min(140, Camera.y + y)), Camera.w, Camera.h)
end
--In world coordinates: top left corner at x, y, extent of 1/w, 1/h.
function Camera.Set( x, y, w, h )
Camera.x, Camera.y, Camera.w, Camera.h = x, y, w, h
Camera.zoom = w / 800
tf:reset()
tf:scale( w / 360, -h / 200 )
tf:translate( 180 - x, -y - 100 )
tfTerritory:reset()
tfTerritory:scale( w / 512, h / 285 )
tfTerritory:translate( -x * 512 / 360, y * 512 / 360 )
tfNodes:reset()
tfNodes:scale( w / 360, -h / 200 )
tfNodes:translate( 180 - x , -y - 100 )
--tfNodes:translate( -x * 800 / 360, y * 400 / 200 )
end
function Camera.Resize( w, h )
w, h = math.min( w, h * 360 / 200 ), math.min( h, w * 200 / 360 )
return Camera.Set( Camera.x, Camera.y, w, h )
end
Camera.Resize( lg.getDimensions() )
return Camera