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# coding: utf-8
# Copyright 2019 DragonRuby LLC
# MIT License
# grid.rb has been released under MIT (*only this file*).
# Contributors outside of DragonRuby who also hold Copyright: _Tradam
module GTK
class Grid
include Serialize
# Returns which direction y is positive in. Negative means upward.
#
# @return [Float] `-1.0` or `1.0`
attr_accessor :screen_y_direction
# The coordinate system currently in use.
#
# @return [Symbol] `:bottom_left`, `:center` or `:top_left`
attr_accessor :name
# Returns the "x" coordinate indicating the bottom of the screen.
#
# @return [Float]
attr_accessor :bottom
# Returns the "x" coordinate indicating the top of the screen.
#
# @return [Float]
attr_accessor :top
# Returns the "y" coordinate indicating the left of the screen.
#
# @return [Float]
attr_accessor :left
# Returns the "y" coordinate indicating the right of the screen.
#
# @return [Float]
attr_accessor :right
# Returns the "x" coordinate indicating the center of the screen.
#
# @return [Float]
attr_accessor :center_x
# Returns the "y" coordinate indicating the center of the screen.
#
# @return [Float]
attr_accessor :center_y
# Returns the bottom left and top right coordinates in a single list.
#
# @return [[Float, Float, Float, Float]]
attr_accessor :rect
# Returns the "x" coordinate of the origin.
#
# @return [Float]
attr_accessor :origin_x
# Returns the "y" coordinate of the origin.
#
# @return [Float]
attr_accessor :origin_y
attr_accessor :left_margin, :bottom_margin
def initialize runtime
@runtime = runtime
@ffi_draw = runtime.ffi_draw
origin_bottom_left!
end
# Returns `x` plus the origin "x".
#
# @return [Float]
def transform_x x
@origin_x + x
end
# Returns `x` minus the origin "x".
#
# @return [Float]
def untransform_x x
x - @origin_x
end
# Returns `y` plus the origin "y".
#
# @return [Float]
def transform_y y
@origin_y + y * screen_y_direction
end
# Returns `y` minus the origin "y".
#
# @return [Float]
def untransform_y y
@origin_y + y * screen_y_direction
end
def ffi_draw
@ffi_draw
end
def ffi_draw= value
@ffi_draw = value
end
# Sets the rendering coordinate system to have its origin in the bottom left.
#
# @return [void]
# @gtk
def origin_bottom_left!
return if @name == :bottom_left
@name = :bottom_left
@origin_x = 0.0
@origin_y = @runtime.logical_height
@left = 0.0
@right = @runtime.logical_width
@top = @runtime.logical_height
@bottom = 0.0
@left_margin = 0.0
@bottom_margin = 0.0
@center_x = @runtime.logical_width.half
@center_y = @runtime.logical_height.half
@rect = [@left, @bottom, @runtime.logical_width, @runtime.logical_height].rect
@center = [@center_x, @center_y].point
@screen_y_direction = -1.0
@ffi_draw.set_grid @origin_x, @origin_y, @screen_y_direction
end
# Sets the rendering coordinate system to have its origin in the center.
#
# @return [void]
# @gtk
def origin_center!
return if @name == :center
@name = :center
@origin_x = @runtime.logical_width.half
@origin_y = @runtime.logical_height.half
@left = [email protected]_width.half
@right = @runtime.logical_width.half
@top = @runtime.logical_height.half
@bottom = [email protected]_height.half
@center_x = 0.0
@center_y = 0.0
@rect = [@left, @bottom, @runtime.logical_width, @runtime.logical_height].rect
@center = [@center_x, @center_y].point
@screen_y_direction = -1.0
@ffi_draw.set_grid @origin_x, @origin_y, @screen_y_direction
end
# Sets the rendering coordinate system to have its origin in the top left.
#
# @return [void]
# @gtk
def origin_top_left!
return if @name == :top_left
@name = :top_left
@origin_x = 0.0
@origin_y = 0.0
@left = 0.0
@right = @runtime.logical_width
@top = 0.0
@bottom = @runtime.logical_height
@center_x = @runtime.logical_width.half
@center_y = @runtime.logical_height.half
@rect = [@left, @runtime.logical_height, @runtime.logical_width, @top].rect
@center = [@center_x, @center_y].point
@screen_y_direction = 1.0
@ffi_draw.set_grid @origin_x, @origin_y, @screen_y_direction
end
# The logical width used for rendering.
#
# @return [Float]
def w
@runtime.logical_width
end
# Half the logical width used for rendering.
#
# @return [Float]
def w_half
w.half
end
# The logical height used for rendering.
#
# @return [Float]
def h
@runtime.logical_height
end
# Half the logical height used for rendering.
#
# @return [Float]
def h_half
h.half
end
# Returns the coordinates indicating the center of the screen.
#
# @return [[Float, Float]]
def center
@center
end
# Returns the coordinates indicating the bottom right of the screen.
#
# @return [[Float, Float]]
def bottom_right
[@right, @bottom].point
end
def x
0
end
def y
0
end
end
end
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