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+--- Thread: BAM: SCROLL statement "super-test" (/showthread.php?tid=1789)
BAM: SCROLL statement "super-test" - CharlieJV - 06-27-2023
If you feel like beating the thing up: test version of BASIC Anywhere Machine.
The test program:
EDIT: The program loops through various scrolling scenarios, incrementing the number of pixels scrolled by 1 every iteration of the loop. Each scroll scenario performs the scroll 20 times. All in fairly slow speed to give an opportunity to see positions of a pixel before and after a scroll statement.
RE: BAM: SCROLL statement "super-test" - bplus - 06-27-2023
Hi Charlie, what you are doing in demo could easily be done by color shifting on a pallet.
The same could be done with text by position shifting start point of display for text.
Here is old demo in QB64:
Code: (Select All)
_Title "Color Cycle AKA Palette Shifting?" 'B+ 2019-04-13 trans from SdlBasic code
'color cycle test.sdlbas {B+=MGA 2016-06-04
Randomize Timer
'option qbasic
Const xmax = 400 '<==== drawing area width
Const ymax = 300 '<==== drawing area height
'setdisplay(xmax, ymax, 32, 1)
'setcaption("Color Cycle test.sdlbas") '<===================== screen title
'autoback(-2)
Screen _NewImage(xmax, ymax, 32)
'dim common pal(16), cIndex=0
Dim Shared pal(16) As _Unsigned Long
Dim Shared cIndex As Integer
'QB colors approx
pal(0) = &HFF000000
pal(1) = &HFF000077
pal(2) = &HFFFF8866
pal(3) = &HFF008888
pal(4) = &HFF880000
pal(5) = &HFFFF8800
pal(6) = &HFF008800
pal(7) = &HFFBBBBBB
pal(8) = &HFF666666
pal(9) = &HFF0000FF
pal(10) = &HFF00FF00
pal(11) = &HFF00FFFF
pal(12) = &HFFFF0000
pal(13) = &HFFFF00FF
pal(14) = &HFFFFFF00
pal(15) = &HFFFFFFFF
While 1
Cls
For i = 0 To 15
'simulate a Palette Shift by shifting the indexs to Palette calls
Line (i * 20 + 40, 100)-Step(20, 100), pal((cIndex + i) Mod 16), BF
cText xmax / 2, 50, 16, pal(15), "Index called:"
cText i * 20 + 5 + 40, 70, 16, pal(15), Str$(i)
cText xmax / 2, 220, 16, pal(15), "Shifted Index call:"
cText i * 20 + 5 + 40, 240, 16, pal(15), Str$((cIndex + i) Mod 16)
Next
_Display
_Limit 1
'INPUT "Press enter for Palette shifting +1 "; wate$
cIndex = (cIndex + 1) Mod 16 'color shift
Wend
Function ccycle (cNum)
ccycle = pal((cIndex + cNum) Mod 16)
End Function
Sub cText (x, y, textHeight, K As _Unsigned Long, txt$)
fg = _DefaultColor
'screen snapshot
cur& = _Dest
I& = _NewImage(8 * Len(txt$), 16, 32)
_Dest I&
Color K, _RGBA32(0, 0, 0, 0)
_PrintString (1, 1), txt$
mult = textHeight / 16
xlen = Len(txt$) * 8 * mult
_PutImage (x - .5 * xlen + 1, y - .5 * textHeight + 1)-Step(xlen, textHeight), I&, cur&
Color fg
_FreeImage I&
End Sub
Of course this can be done without _PutImage by redrawing over same screen area each loop.
Maybe I am missing something?
RE: BAM: SCROLL statement "super-test" - CharlieJV - 06-27-2023
(06-27-2023, 12:49 PM)bplus Wrote: Hi Charlie, what you are doing in demo could easily be done by color shifting on a pallet.
The same could be done with text by position shifting start point of display for text.
Here is old demo in QB64:
Code: (Select All)
_Title "Color Cycle AKA Palette Shifting?" 'B+ 2019-04-13 trans from SdlBasic code
'color cycle test.sdlbas {B+=MGA 2016-06-04
Randomize Timer
'option qbasic
Const xmax = 400 '<==== drawing area width
Const ymax = 300 '<==== drawing area height
'setdisplay(xmax, ymax, 32, 1)
'setcaption("Color Cycle test.sdlbas") '<===================== screen title
'autoback(-2)
Screen _NewImage(xmax, ymax, 32)
'dim common pal(16), cIndex=0
Dim Shared pal(16) As _Unsigned Long
Dim Shared cIndex As Integer
'QB colors approx
pal(0) = &HFF000000
pal(1) = &HFF000077
pal(2) = &HFFFF8866
pal(3) = &HFF008888
pal(4) = &HFF880000
pal(5) = &HFFFF8800
pal(6) = &HFF008800
pal(7) = &HFFBBBBBB
pal(8) = &HFF666666
pal(9) = &HFF0000FF
pal(10) = &HFF00FF00
pal(11) = &HFF00FFFF
pal(12) = &HFFFF0000
pal(13) = &HFFFF00FF
pal(14) = &HFFFFFF00
pal(15) = &HFFFFFFFF
While 1
Cls
For i = 0 To 15
'simulate a Palette Shift by shifting the indexs to Palette calls
Line (i * 20 + 40, 100)-Step(20, 100), pal((cIndex + i) Mod 16), BF
cText xmax / 2, 50, 16, pal(15), "Index called:"
cText i * 20 + 5 + 40, 70, 16, pal(15), Str$(i)
cText xmax / 2, 220, 16, pal(15), "Shifted Index call:"
cText i * 20 + 5 + 40, 240, 16, pal(15), Str$((cIndex + i) Mod 16)
Next
_Display
_Limit 1
'INPUT "Press enter for Palette shifting +1 "; wate$
cIndex = (cIndex + 1) Mod 16 'color shift
Wend
Function ccycle (cNum)
ccycle = pal((cIndex + cNum) Mod 16)
End Function
Sub cText (x, y, textHeight, K As _Unsigned Long, txt$)
fg = _DefaultColor
'screen snapshot
cur& = _Dest
I& = _NewImage(8 * Len(txt$), 16, 32)
_Dest I&
Color K, _RGBA32(0, 0, 0, 0)
_PrintString (1, 1), txt$
mult = textHeight / 16
xlen = Len(txt$) * 8 * mult
_PutImage (x - .5 * xlen + 1, y - .5 * textHeight + 1)-Step(xlen, textHeight), I&, cur&
Color fg
_FreeImage I&
End Sub
Of course this can be done without _PutImage by redrawing over same screen area each loop.
Maybe I am missing something?
That's flying right over my head. I have no idea where you're going with that.
This is just to test the SCROLL statement to make sure each pixel is scrolling to the correct position, no matter what parameters get thrown at the statement. Easier to identify the pixels using color.
SCROLL is about scrolling whatever happens to be on the screen. All text and all graphics. All pixels.
I think what you are writing about would only ever apply to the specific graphic used in this test case, but would not work with all cases of whatever is on the screen.
RE: BAM: SCROLL statement "super-test" - CharlieJV - 06-27-2023
(06-27-2023, 04:46 AM)CharlieJV Wrote: If you feel like beating the thing up: test version of BASIC Anywhere Machine.
The test program:
Updated the test with the text "Hi" in the middle of the screen.
RE: BAM: SCROLL statement "super-test" - bplus - 06-27-2023
Yeah, sorry, I guess I confused scrolling a screen with scrolling through other linear things like text or pallets.
RE: BAM: SCROLL statement "super-test" - CharlieJV - 06-27-2023
Just another sanity check to make sure scrolling part of the screen works not just for middling portions:
Code: (Select All)
CONST HORIZONTAL = 2, VERTICAL = 1
SCREEN _NEWIMAGE(16,16,7)
FOR x = 0 TO 14 STEP 2
FOR y = 0 TO 14 STEP 2
PSET (x,y), CHOOSE( INT(RND*2)+1, 3, 14)
NEXT y
NEXT x
_DELAY 1
➔again:
axis = INT(RND*2) + 1
this_index = INT(RND*4) * 2
increment = CHOOSE( INT(RND*2)+1, 1, -1)
FOR l = 1 TO 10
IF axis = VERTICAL THEN
SCROLL (this_index,0)-(this_index,15), 0, increment, TRUE
ELSE
SCROLL (0,this_index)-(15,this_index), increment, 0, TRUE
END IF
_DELAY 0.25
NEXT l
GOTO ➔again