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https://github.com/cyberarm/cyberarm_engine.git
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47 lines
1.3 KiB
Ruby
47 lines
1.3 KiB
Ruby
module CyberarmEngine
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class OrthographicCamera
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attr_accessor :position, :orientation, :zoom, :left, :right, :bottom, :top,
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:min_view_distance, :max_view_distance
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def initialize(
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position:, right:, top:, orientation: Vector.new(0, 0, 0),
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zoom: 1, left: 0, bottom: 0,
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min_view_distance: 0.1, max_view_distance: 200.0
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)
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@position = position
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@orientation = orientation
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@zoom = zoom
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@left = left
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@right = right
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@bottom = bottom
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@top = top
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@min_view_distance = min_view_distance
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@max_view_distance = max_view_distance
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end
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# Immediate mode renderering fallback
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def draw
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glMatrixMode(GL_PROJECTION)
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glLoadIdentity
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glOrtho(@left, @right, @bottom, @top, @min_view_distance, @max_view_distance)
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glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)
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glRotatef(@orientation.x, 1, 0, 0)
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glRotatef(@orientation.y, 0, 1, 0)
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glTranslatef(-@position.x, -@position.y, -@position.z)
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glMatrixMode(GL_MODELVIEW)
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glLoadIdentity
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end
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def projection_matrix
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Transform.orthographic(@left, @right, @bottom, @top, @min_view_distance, @max_view_distance)
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end
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def view_matrix
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Transform.translate_3d(@position * -1) * Transform.rotate_3d(@orientation)
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end
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end
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end
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