Graphics 1024, 768, 32, 2
SetBuffer BackBuffer()
SetFont LoadFont("Arial", 15)
HidePointer
BG = LoadImage("Forest.jpg")
Img = CreateImage(100, 100)
num = 1
While Not KeyHit(1)
DrawBlock BG, 0, 0
Color 0, 0, 0
Rect 0, 0, GraphicsWidth(), 20
Color 255, 255, 255
Text 10, 2, "Press keys 1-10 and move the mouse to see the effects."
mx = MouseX() - 50
my = MouseY() - 50
CopyRect mx, my, 100, 100, 0, 0, BackBuffer(), ImageBuffer(Img)
For i = 1 To 4
If KeyHit(i + 1) Then num = i
Next
Select num
Case 1: ShadeImage(Img, "Negative")
Case 2: ShadeImage(Img, "Greyscale")
Case 3: ShadeImage(Img, "1Bit")
Case 4: ShadeImage(Img, "Blur", 3)
End Select
DrawBlock Img, mx, my
Rect mx, my, 100, 100, False
Flip
Wend
End
Dim Pix(-1, -1, -1)
Function ShadeImage(img, effect$, param1 = 0)
w = ImageWidth(img) - 1
h = ImageHeight(img) - 1
ib = ImageBuffer(img)
LockBuffer ib
Select Lower(effect$)
Case "negative" ;Negative
For x = 0 To w
For y = 0 To h
rgb = ReadPixelFast(x, y, ib)
WritePixelFast x, y, (255 - (rgb And $FF0000) / $10000) * $10000 + (255 - (rgb And $FF00) / $100) * $100 + (255 - rgb And $FF), ib
Next
Next
Case "greyscale" ;Greyscale
For x = 0 To w
For y = 0 To h
rgb = ReadPixelFast(x, y, ib)
col = Float((rgb And $FF0000) / $10000 + (rgb And $FF00) / $100 + (rgb And $FF)) / 3.0
WritePixelFast x, y, col * $10000 + col * $100 + col, ib
Next
Next
Case "1bit" ;Black/white
For x = 0 To w
For y = 0 To h
rgb = ReadPixelFast(x, y, ib)
col = (Float((rgb And $FF0000) / $10000 + (rgb And $FF00) / $100 + (rgb And $FF)) / 3.0 > 127) * 255
WritePixelFast x, y, col * $10000 + col * $100 + col, ib
Next
Next
Case "blur" ;Blur - param1 is the blur radius.
Dim Pix(w, h, 2)
For x = 0 To w
For y = 0 To h
rgb = ReadPixelFast(x, y, ib)
Pix(x, y, 0) = (rgb And $FF0000) / $10000
Pix(x, y, 1) = (rgb And $FF00) / $100
Pix(x, y, 2) = rgb And $FF
Next
Next
For x = 0 To w
For y = 0 To h
r = 0
g = 0
b = 0
For x2 = -param1 To param1
For y2 = -param1 To param1
rx = x + x2
ry = y + y2
If rx < 0 Then rx = 0
If rx > w Then rx = w
If ry < 0 Then ry = 0
If ry > h Then ry = h
r = r + Pix(rx, ry, 0)
g = g + Pix(rx, ry, 1)
b = b + Pix(rx, ry, 2)
Next
Next
div = (param1 * 2 + 1) ^ 2
r = r / div
g = g / div
b = b / div
WritePixelFast x, y, r * $10000 + g * $100 + b, ib
Next
Next
Default
RuntimeError "Image shading effect not found."
End Select
UnlockBuffer ib
End Function |
