mirror of
https://github.com/cyberarm/i-mic-rts.git
synced 2025-12-14 07:12:34 +00:00
100 lines
2.8 KiB
Ruby
100 lines
2.8 KiB
Ruby
class IMICRTS
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class Camera
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attr_reader :position, :velocity, :zoom, :drag
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def initialize(scroll_speed: 10, position: CyberarmEngine::Vector.new(0.0, 0.0))
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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.translate(@position.x, @position.y) do
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center_point = center
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Gosu.scale(@zoom, @zoom, center.x, center.y) 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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end
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def mouse_pick(x, y)
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mouse = CyberarmEngine::Vector.new(x, y) / @zoom
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normalized = (mouse / @zoom - @position / @zoom) * @zoom
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normalized.x = normalized.x.floor
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normalized.y = normalized.y.floor
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return normalized
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end
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def center
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(CyberarmEngine::Vector.new(window.width / 2, window.height / 2) / @zoom - @position / @zoom) * @zoom
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end
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def center_around(vector, factor)
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@velocity *= 0
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delta = lerp(self.center, vector, factor)
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@position += delta * window.dt
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end
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def lerp(vec1, vec2, factor)
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(vec1 - vec2) * factor.clamp(0.0, 1.0)
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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 = lerp(@position, CyberarmEngine::Vector.new(window.mouse_x, window.mouse_y) - @drag_start, @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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@position_start = @position.clone
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@drag_start = 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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@position_start = nil
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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 |