Drawing Tools Subs or Functions with Demo

[bplus]

@James D Jarvis,

Here is possibly the original Galleon Rotozoom:

Code: (Select All)

Sub RotoZoom (X As Long, Y As Long, Image As Long, Scale As Single, degreesRotation As Single)
    Dim px(3) As Single, py(3) As Single, W&, H&, sinr!, cosr!, i&, x2&, y2&
    W& = _Width(Image&): H& = _Height(Image&)
    px(0) = -W& / 2: py(0) = -H& / 2: px(1) = -W& / 2: py(1) = H& / 2
    px(2) = W& / 2: py(2) = H& / 2: px(3) = W& / 2: py(3) = -H& / 2
    sinr! = Sin(-degreesRotation / 57.2957795131): cosr! = Cos(-degreesRotation / 57.2957795131)
    For i& = 0 To 3
        x2& = (px(i&) * cosr! + sinr! * py(i&)) * Scale + X: y2& = (py(i&) * cosr! - px(i&) * sinr!) * Scale + Y
        px(i&) = x2&: py(i&) = y2&
    Next
    _MapTriangle (0, 0)-(0, H& - 1)-(W& - 1, H& - 1), Image& To(px(0), py(0))-(px(1), py(1))-(px(2), py(2))
    _MapTriangle (0, 0)-(W& - 1, 0)-(W& - 1, H& - 1), Image& To(px(0), py(0))-(px(3), py(3))-(px(2), py(2))
End Sub

That is what I have in my 000Handy.bas post I made earlier. I am not sure I think I modified it for Radian Rotation Angle and Galleon might have done it in degrees. Yes, try the Wiki lookup for _MapTriangle it has the original Galleon RotoZoom, it might work out better?

Code: (Select All)

SUB RotoZoom (X AS LONG, Y AS LONG, Image AS LONG, Scale AS SINGLE, Rotation AS SINGLE)
DIM px(3) AS SINGLE: DIM py(3) AS SINGLE
W& = _WIDTH(Image&): H& = _HEIGHT(Image&)
px(0) = -W& / 2: py(0) = -H& / 2: px(1) = -W& / 2:py(1) = H& / 2
px(2) = W& / 2: py(2) = H& / 2: px(3) = W& / 2: py(3) = -H& / 2
sinr! = SIN(-Rotation / 57.2957795131): cosr! = COS(-Rotation / 57.2957795131)
FOR i& = 0 TO 3
  x2& = (px(i&) * cosr! + sinr! * py(i&)) * Scale + X: y2& = (py(i&) * cosr! - px(i&) * sinr!) * Scale + Y
  px(i&) = x2&: py(i&) = y2&
NEXT
_MAPTRIANGLE (0, 0)-(0, H& - 1)-(W& - 1, H& - 1), Image& TO(px(0), py(0))-(px(1), py(1))-(px(2), py(2))
_MAPTRIANGLE (0, 0)-(W& - 1, 0)-(W& - 1, H& - 1), Image& TO(px(0), py(0))-(px(3), py(3))-(px(2), py(2))
END SUB

Looks like I just labeled the Rotation Angle more clearly with Degree units.

I am curious of results if you experiment with that.