mirror of
https://github.com/cyberarm/i-mic-rts.git
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114 lines
3.4 KiB
Ruby
114 lines
3.4 KiB
Ruby
class IMICRTS
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class Camera
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attr_reader :viewport, :position, :velocity, :zoom, :drag
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def initialize(viewport:, scroll_speed: 10, position: CyberarmEngine::Vector.new(0.0, 0.0))
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@viewport = CyberarmEngine::BoundingBox.new(viewport[0], viewport[1], viewport[2], viewport[3])
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@scroll_speed = scroll_speed
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@position = position
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@velocity = CyberarmEngine::Vector.new(0.0, 0.0)
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@zoom = 1.0
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@min_zoom = 0.25
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@max_zoom = 4.0
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@drag = 0.8 # Used to arrest velocity
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@grab_drag = 0.5 # Used when camera is panned using middle mouse button
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end
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def window; $window; end
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def draw(&block)
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if block
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Gosu.clip_to(@viewport.min.x, @viewport.min.y, @viewport.max.x, @viewport.max.y) do
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center_point = center
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Gosu.transform(*worldspace.elements) do
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block.call
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end
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end
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end
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end
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def update
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move
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@velocity *= @drag
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@position += @velocity * @scroll_speed
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@viewport.max.x = window.width
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@viewport.max.y = window.height
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end
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def pick(vector)
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inverse = (vector - @position) / @zoom
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inverse.x = inverse.x.floor
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inverse.y = inverse.y.floor
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return inverse
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end
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def center
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(CyberarmEngine::Vector.new(window.width / 2, window.height / 2) - @position)
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end
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def center_around(vector, factor)
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@velocity *= 0
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@position += center.lerp(vector, factor) * window.dt
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end
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def worldspace
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zoom_vector = CyberarmEngine::Vector.new(@zoom, @zoom)
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position_matrix = CyberarmEngine::Matrix.translate(@position)
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CyberarmEngine::Matrix.concat(CyberarmEngine::Matrix.scale(zoom_vector, center), position_matrix)
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end
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def visible?(object)
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if object.is_a?(Map::Tile)
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object.position.x - object.size >= @viewport.min.x - @position.x &&
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object.position.y - object.size >= @viewport.min.y - @position.y &&
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object.position.x <= @viewport.max.x - @position.x &&
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object.position.y <= @viewport.max.y - @position.y
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else
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pp object.class
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exit
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end
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end
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def aspect_ratio
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window.height / window.width.to_f
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end
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def move
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@velocity.x += @scroll_speed * window.dt if Gosu.button_down?(Gosu::KB_LEFT) || window.mouse_x < 15
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@velocity.x -= @scroll_speed * window.dt if Gosu.button_down?(Gosu::KB_RIGHT) || window.mouse_x > window.width - 15
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@velocity.y += @scroll_speed * window.dt if Gosu.button_down?(Gosu::KB_UP) || window.mouse_y < 15
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@velocity.y -= @scroll_speed * window.dt if Gosu.button_down?(Gosu::KB_DOWN) || window.mouse_y > window.height - 15
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if @drag_start
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@velocity *= 0.0
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@position = @position.lerp(@drag_start - CyberarmEngine::Vector.new(window.mouse_x, window.mouse_y), @grab_drag)
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end
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end
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def button_down(id)
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case id
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when Gosu::KB_H
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@position.x, @position.y = 0.0, 0.0
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@velocity *= 0.0
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when Gosu::MS_WHEEL_UP
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@zoom = (@zoom + 0.25).clamp(@min_zoom, @max_zoom)
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when Gosu::MS_WHEEL_DOWN
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@zoom = (@zoom - 0.25).clamp(@min_zoom, @max_zoom)
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when Gosu::MS_MIDDLE
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@drag_start = pick(CyberarmEngine::Vector.new(window.mouse_x, window.mouse_y))
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end
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end
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def button_up(id)
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case id
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when Gosu::MS_MIDDLE
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@drag_start = nil
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end
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end
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end
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end |