115 lines
2.7 KiB
Standard ML
115 lines
2.7 KiB
Standard ML
structure MoveMode =
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struct
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open AppType
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open InputMessage
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open DrawMessage
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open UpdateMessage
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(* todo: resize message, escape button to go back to normal mode *)
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fun makeBlankYAxis length =
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Vector.tabulate (length, fn _ => {r = 0, g = 0, b = 0, a = 0})
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fun getDrawMsg (model: app_type) =
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let
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val
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{ canvasWidth
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, canvasHeight
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, windowWidth
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, windowHeight
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, squares
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, xClickPoints
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, yClickPoints
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, ...
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} = model
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val maxSide = Int.max (canvasWidth, canvasHeight)
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val squares = CollisionTree.toTriangles
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( windowWidth
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, windowHeight
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, squares
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, maxSide
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, canvasWidth
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, canvasHeight
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, xClickPoints
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, yClickPoints
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)
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val drawMsg =
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DRAW_SQUARES_AND_DOTS {squares = squares, dots = Vector.fromList []}
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in
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(model, [DRAW drawMsg])
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end
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fun moveImageUp (model: app_type) =
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let
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val {squares, ...} = model
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val squares =
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Vector.mapi
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(fn (idx, yAxis) =>
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if idx + 1 < Vector.length squares then
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Vector.sub (squares, idx + 1)
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else
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makeBlankYAxis (Vector.length yAxis)) squares
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val model = AppWith.squares (model, squares)
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in
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getDrawMsg model
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end
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fun moveImageDown (model: app_type) =
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let
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val {squares, ...} = model
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val squares =
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Vector.mapi
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(fn (idx, yAxis) =>
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if idx = 0 then makeBlankYAxis (Vector.length yAxis)
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else Vector.sub (squares, idx - 1)) squares
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val model = AppWith.squares (model, squares)
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in
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getDrawMsg model
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end
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fun moveImageLeft (model: app_type) =
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let
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val {squares, ...} = model
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val squares =
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Vector.mapi
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(fn (idx, yAxis) =>
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if idx = 0 then makeBlankYAxis (Vector.length squares)
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else Vector.sub (squares, idx - 1)) squares
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val model = AppWith.squares (model, squares)
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in
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getDrawMsg model
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end
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fun moveImageRight (model: app_type) =
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let
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val {squares, ...} = model
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val squares =
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Vector.mapi
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(fn (idx, yAxis) =>
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if idx + 1 = Vector.length squares then
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makeBlankYAxis (Vector.length squares)
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else
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Vector.sub (squares, idx + 1)) squares
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val model = AppWith.squares (model, squares)
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in
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getDrawMsg model
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end
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fun update (model, inputMsg) =
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case inputMsg of
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ARROW_UP => moveImageUp model
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| ARROW_DOWN => moveImageDown model
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| ARROW_LEFT => moveImageLeft model
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| ARROW_RIGHT => moveImageRight model
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| _ => (model, [])
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end
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