120 lines
3.6 KiB
Standard ML
120 lines
3.6 KiB
Standard ML
structure AppUpdate =
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struct
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open AppType
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local
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fun helpGetTrianglesVector (lst, acc) =
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case lst of
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{x1, y1, x2, y2, x3, y3} :: tl =>
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let val vec = #[x1, y1, x2, y2, x3, y3]
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in helpGetTrianglesVector (tl, vec :: acc)
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end
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| [] => acc
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in
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fun getTrianglesVector (app: app_type) =
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let val lst = helpGetTrianglesVector (#triangles app, [])
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in Vector.concat lst
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end
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end
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fun genClickPoints (windowWidth, windowHeight) =
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let
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val w = Real32.fromInt windowWidth / 40.0
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val h = Real32.fromInt windowHeight / 40.0
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in
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Vector.tabulate (41, fn idx => Real32.fromInt idx * w)
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end
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local
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val clickPoints =
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genClickPoints (Constants.windowWidth, Constants.windowHeight)
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fun getVerticalClickPos (idx, horizontalPos, mouseX, mouseY, r, g, b) =
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if idx = Vector.length clickPoints then
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#[]
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else
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let
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val curVerticalPos = Vector.sub (clickPoints, idx)
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in
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if mouseY < curVerticalPos - 7.0 orelse mouseY > curVerticalPos + 7.0 then
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getVerticalClickPos
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(idx + 1, horizontalPos, mouseX, mouseY, r, g, b)
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else
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let
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val halfWidth = Real32.fromInt (Constants.windowWidth div 2)
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val halfHeight = Real32.fromInt (Constants.windowHeight div 2)
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val hpos = horizontalPos - halfWidth
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val vpos = ~(curVerticalPos - halfHeight)
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val left = (hpos - 5.0) / halfWidth
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val right = (hpos + 5.0) / halfWidth
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val bottom = (vpos - 5.0) / halfHeight
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val top = (vpos + 5.0) / halfHeight
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in
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#[ left, bottom, r, g, b
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, right, bottom, r, g, b
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, left, top, r, g, b
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, left, top, r, g, b
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, right, bottom, r, g, b
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, right, top, r, g, b
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]
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end
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end
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fun getHorizontalClickPos (idx, mouseX, mouseY, r, g, b) =
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if idx = Vector.length clickPoints then
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#[]
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else
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let
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val curPos = Vector.sub (clickPoints, idx)
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in
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if mouseX < curPos - 7.0 orelse mouseX > curPos + 7.0 then
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getHorizontalClickPos (idx + 1, mouseX, mouseY, r, g, b)
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else
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getVerticalClickPos (0, curPos, mouseX, mouseY, r, g, b)
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end
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in
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(*
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* This function returns a vector containing the position data of the
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* clicked square.
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* If a square wasn't found at the clicked position,
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* an empty vector is returned.
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*)
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fun getClickPos (mouseX, mouseY, r, g, b) =
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getHorizontalClickPos
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(0, Real32.fromInt mouseX, Real32.fromInt mouseY, r, g, b)
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end
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fun update (model, mouseX, mouseY, inputMsg) =
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let
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open DrawMessage
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open InputMessage
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in
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case inputMsg of
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MOUSE_MOVE {x = mouseX, y = mouseY} =>
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let
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val _ = print "mouse moved\n"
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val drawMsg = DRAW_BUTTON (getClickPos
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(mouseX, mouseY, 1.0, 0.0, 0.0))
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in
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(model, drawMsg, mouseX, mouseY)
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end
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| MOUSE_LEFT_RELEASE =>
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let
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val _ = print "mouse released\n"
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val drawMsg = DRAW_BUTTON (getClickPos
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(mouseX, mouseY, 1.0, 0.0, 0.0))
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in
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(model, drawMsg, mouseX, mouseY)
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end
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| MUSE_LEFT_CLICK =>
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let
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val _ = print "mouse clicked\n"
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val buttonVec = getClickPos (mouseX, mouseY, 0.0, 0.0, 1.0)
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val drawMsg = DRAW_BUTTON buttonVec
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in
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(model, drawMsg, mouseX, mouseY)
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end
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end
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end
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