Program ScreenShots: Difference between revisions

Attention!! - This page is outdated and provided for reference and/or education only. (Return to historic Table of Contents)

Starting with QB64-PE v3.9.0 the functionality described here was superseded by _SAVEIMAGE.

Creating Screenshot Bitmaps inside of your Programs

Syntax

EightBit Minimum_Column%, Minimum_Row%, Maximum_Column%, Maximum_Row%, NewFileName$

Description

The values of x1%, y%1, x2% and y2% can be any ON SCREEN area coordinates in the screen mode used.
You MUST subtract one when using the QB64 FULL SCREEN _WIDTH and _HEIGHT values! Otherwise POINT will return an Illegal function error! The maximum is one pixel less than the SCREEN resolution or the screen dimensions.
Both SUBs can be used in QB64 or QBasic! The FourBit SUB takes about 8 seconds in QB.
FourBit SUB creates 4 BPP(16 color) and EightBit SUB creates 8 BPP(256 color) bitmaps.

QB64 Custom Screens

See the ThirtyTwoBit SUB routine to create QB64 screenshots of _NEWIMAGE screen pages or copy images loaded using _LOADIMAGE. Creates 256 or 24/32 bit color bitmaps using the QB64 image and page handles.

Examples


'----------------- Freeware by Bob Seguin 2003 -- (TheBOB) --------------------------|
'|                                                                                   |
'|   ---- Decreased POINT time of 4 bit fullscreen to 8 seconds in QBasic ----       |
'|                     by Ted Weissgerber July, 2008                                 |
'|     - Add a special keypress to a game program to create a Screenshot -           |
'|                                                                                   |
'--------------------------------- DEMO CODE -----------------------------------------

DO: CLS
INPUT "ENTER Screen Mode 12 or 13 (0 quits): ", scrn%

IF scrn% = 13 THEN
  SCREEN 13              '8 bit (256 colors) only
  LINE (0, 0)-(319, 199), 13, BF
  CIRCLE (160, 100), 50, 11
  PAINT STEP(0, 0), 9, 11
  Start! = TIMER
  EightBIT 0, 0, 319, 199, "Purple8"

ELSEIF scrn% = 12 THEN
  SCREEN 12              '4 bit(16 colors) only
  LINE (0, 0)-(639, 479), 13, BF
  LINE (100, 100)-(500, 400), 12, BF
  CIRCLE (320, 240), 100, 11
  PAINT STEP(0, 0), 9, 11
  Start! = TIMER
  FourBIT 0, 0, 639, 479, "Purple4"  '469, 239
ELSE : SYSTEM
END IF

Finish! = TIMER  'elapsed times valid for QB only
PRINT "Elapsed time ="; Finish! - Start!; "secs."; "Press Escape to quit!"
DO: K$ = INKEY$: LOOP UNTIL K$ <> ""
LOOP UNTIL K$ = CHR$(27)
SYSTEM

            '****************  End DEMO code ***********************


SUB EightBit (x1%, y1%, x2%, y2%, Filename$)   'SCREEN 13(256 color) bitmap maker
'NOTE: Adjust x2% = 319 and y2% = 199 for legal POINTs when fullscreen in SCREEN 13
DIM FileCOLORS%(1 TO 768)
DIM Colors8%(255)
IF x1% > x2% THEN SWAP x1%, x2%
IF y1% > y2% THEN SWAP y1%, y2%
IF INSTR(Filename$, ".BMP") = 0 THEN
Filename$ = RTRIM$(LEFT$(Filename$, 8)) + ".BMP"
END IF

FileTYPE$ = "BM"
Reserved1% = 0
Reserved2% = 0
OffsetBITS& = 1078
InfoHEADER& = 40
PictureWIDTH& = (x2% - x1%) + 1
PictureDEPTH& = (y2% - y1%) + 1
NumPLANES% = 1
BPP% = 8
Compression& = 0
WidthPELS& = 3780
DepthPELS& = 3780
NumCOLORS& = 256

IF (PictureWIDTH& AND 3) THEN ZeroPAD$ = SPACE$(4 - (x& AND 3))

ImageSIZE& = (PictureWIDTH& + LEN(ZeroPAD$)) * PictureDEPTH&
FileSize& = ImageSIZE& + OffsetBITS&

OUT &H3C7, 0
FOR n = 1 TO 768 STEP 3
  FileCOLORS%(n) = INP(&H3C9)
  FileCOLORS%(n + 1) = INP(&H3C9)
  FileCOLORS%(n + 2) = INP(&H3C9)
NEXT n
f% = FREEFILE
OPEN Filename$ FOR BINARY AS #f%

PUT #f%, , FileTYPE$
PUT #f%, , FileSize&
PUT #f%, , Reserved1% 'should be zero
PUT #f%, , Reserved2% 'should be zero
PUT #f%, , OffsetBITS&
PUT #f%, , InfoHEADER&
PUT #f%, , PictureWIDTH&
PUT #f%, , PictureDEPTH&
PUT #f%, , NumPLANES%
PUT #f%, , BPP%
PUT #f%, , Compression&
PUT #f%, , ImageSIZE&
PUT #f%, , WidthPELS&
PUT #f%, , DepthPELS&
PUT #f%, , NumCOLORS&
PUT #f%, , SigCOLORS&     '51 to 54

u$ = " "
FOR n% = 1 TO 768 STEP 3  'PUT as BGR order colors
  Colr$ = CHR$(FileCOLORS%(n% + 2) * 4)
  PUT #f%, , Colr$
  Colr$ = CHR$(FileCOLORS%(n% + 1) * 4)
  PUT #f%, , Colr$
  Colr$ = CHR$(FileCOLORS%(n%) * 4)
  PUT #f%, , Colr$
  PUT #f%, , u$ 'Unused byte
NEXT n%

FOR y = y2% TO y1% STEP -1   'place bottom up
  FOR x = x1% TO x2%
    a$ = CHR$(POINT(x, y))
    Colors8%(ASC(a$)) = 1
    PUT #f%, , a$
  NEXT x
  PUT #f%, , ZeroPAD$
NEXT y

FOR n = 0 TO 255
  IF Colors8%(n) = 1 THEN SigCOLORS& = SigCOLORS& + 1
NEXT n

PUT #f%, 51, SigCOLORS&
CLOSE #f%
END SUB



SUB FourBit (x1%, y1%, x2%, y2%, Filename$)   ' SCREEN 12(16 color) bitmap maker
       'fullscreen takes about 8 seconds in QB
'NOTE: Adjust x2% = 639 and y2% = 479 for legal POINTs when fullscreen in SCREEN 12
DIM FileCOLORS%(1 TO 48)
DIM Colors4%(0 TO 15)
IF x1% > x2% THEN SWAP x1%, x2%
IF y1% > y2% THEN SWAP y1%, y2%
IF INSTR(Filename$, ".BMP") = 0 THEN
    Filename$ = RTRIM$(LEFT$(Filename$, 8)) + ".BMP"
END IF

FileTYPE$ = "BM"
Reserved1% = 0
Reserved2% = 0
OffsetBITS& = 118
InfoHEADER& = 40
PictureWIDTH& = (x2% - x1%) + 1
PictureDEPTH& = (y2% - y1%) + 1
NumPLANES% = 1
BPP% = 4
Compression& = 0
WidthPELS& = 3780
DepthPELS& = 3780
NumCOLORS& = 16

IF PictureWIDTH& MOD 8 <> 0 THEN
   ZeroPAD$ = SPACE$((8 - PictureWIDTH& MOD 8) \ 2)
END IF

ImageSIZE& = (((PictureWIDTH& + LEN(ZeroPAD$)) * PictureDEPTH&) + .1) / 2
FileSize& = ImageSIZE& + OffsetBITS&

OUT &H3C7, 0                    'start at color 0
FOR n = 1 TO 48 STEP 3
  FileCOLORS%(n) = INP(&H3C9)
  FileCOLORS%(n + 1) = INP(&H3C9)
  FileCOLORS%(n + 2) = INP(&H3C9)
NEXT n
f% = FREEFILE
OPEN Filename$ FOR BINARY AS #f%
                                   'Header bytes
PUT #f%, , FileTYPE$                   '2 '1 to 2
PUT #f%, , FileSize&                   '4
PUT #f%, , Reserved1% 'should be zero  '2
PUT #f%, , Reserved2% 'should be zero  '2
PUT #f%, , OffsetBITS&                 '4
PUT #f%, , InfoHEADER&                 '4
PUT #f%, , PictureWIDTH&               '4
PUT #f%, , PictureDEPTH&               '4
PUT #f%, , NumPLANES%                  '2
PUT #f%, , BPP%                        '2
PUT #f%, , Compression&                '4
PUT #f%, , ImageSIZE&                  '4
PUT #f%, , WidthPELS&                  '4
PUT #f%, , DepthPELS&                  '4
PUT #f%, , NumCOLORS&                  '4
PUT #f%, , SigCOLORS&                  '4 '51 - 54

u$ = " "             'unused byte
FOR n% = 1 TO 46 STEP 3   'PUT as BGR order colors
  Colr$ = CHR$(FileCOLORS%(n% + 2) * 4)
  PUT #f%, , Colr$
  Colr$ = CHR$(FileCOLORS%(n% + 1) * 4)
  PUT #f%, , Colr$
  Colr$ = CHR$(FileCOLORS%(n%) * 4)
  PUT #f%, , Colr$
  PUT #f, , u$ 'add Unused byte
NEXT n%

FOR y = y2% TO y1% STEP -1    'Place from bottom up
  FOR x = x1% TO x2% STEP 2   'nibble steps
    HiX = POINT(x, y): Colors4%(HiX) = 1     'added here
    LoX = POINT(x + 1, y): Colors4%(LoX) = 1
    HiNIBBLE$ = HEX$(HiX)
    LoNIBBLE$ = HEX$(LoX)
    HexVAL$ = "&H" + HiNIBBLE$ + LoNIBBLE$
    a$ = CHR$(VAL(HexVAL$))
    PUT #f%, , a$
  NEXT x
  PUT #f%, , ZeroPAD$
NEXT y

FOR n = 0 TO 15
  IF Colors4%(n) = 1 THEN SigCOLORS& = SigCOLORS& + 1
NEXT n
PUT #f%, 51, SigCOLORS&

CLOSE #f%
'BEEP         'optional sound not needed in QB64 as speed is fast
END SUB

More Examples

QB64 Programming References

Wiki Pages Main Page with Articles and Tutorials QB64 specific keywords (alphabetical) Original QBasic keywords (alphabetical) QB64 OpenGL keywords (alphabetical) Keywords by Usage Got a question about something? Frequently Asked Questions about QB64 QB64 Phoenix Edition Community Forum Links to other QBasic Sites: Pete's QBasic Forum Pete's QBasic Downloads

@@ Line 1: / Line 1: @@
+----
+----
+<center>'''{{Text|Attention!! - This page is outdated and provided for reference and/or education only.|red}}'''</center>
+<center>([[Historic Pages|Return to historic Table of Contents]])</center>
+----
+<center>Starting with '''QB64-PE v3.9.0''' the functionality described here was superseded by [[_SAVEIMAGE]].</center>
+----
+----<br>
 <center> '''Creating Screenshot Bitmaps inside of your Programs'''</center>
-''Syntax:'' EightBit Minimum_Column%, Minimum_Row%, Maximum_Column%, Maximum_Row%, NewFileName$
+{{PageSyntax}}
+: EightBit Minimum_Column%, Minimum_Row%, Maximum_Column%, Maximum_Row%, NewFileName$
+{{PageDescription}}
 * The values of x1%, y%1, x2% and y2% can be any ON SCREEN area coordinates in the screen mode used.
-* You MUST subtract one when using the '''QB64'''  FULL SCREEN [[_WIDTH]] and [[_HEIGHT]] values! Otherwise [[POINT]] will return an [[ERROR Codes|Illegal function error]]! The maximum is one pixel less than the [[SCREEN (statement)| SCREEN]] resolution or the screen dimensions.
+* You MUST subtract one when using the '''QB64'''  FULL SCREEN [[_WIDTH]] and [[_HEIGHT]] values! Otherwise [[POINT]] will return an [[ERROR Codes|Illegal function error]]! The maximum is one pixel less than the [[SCREEN]] resolution or the screen dimensions.
 * Both [[SUB]]s can be used in '''QB64''' or QBasic! The FourBit SUB takes about 8 seconds in QB.
 * FourBit SUB creates 4 BPP(16 color) and EightBit SUB creates 8 BPP(256 color) bitmaps.
@@ Line 15: / Line 26: @@
+{{PageExamples}}
 {{CodeStart}}
@@ Line 29: / Line 41: @@
 {{Cl|IF}} scrn% = 13 {{Cl|THEN}}
-   {{Cl|SCREEN (statement)|SCREEN}} 13              '8 bit (256 colors) only
+   {{Cl|SCREEN}} 13              '8 bit (256 colors) only
    {{Cl|LINE}} (0, 0)-(319, 199), 13, BF
    {{Cl|CIRCLE}} (160, 100), 50, 11
    {{Cl|PAINT}} {{Cl|STEP}}(0, 0), 9, 11
-   Start! = {{Cl|TIMER}}
+   Start! = {{Cl|TIMER (function)|TIMER}}
    EightBIT 0, 0, 319, 199, "Purple8"
 {{Cl|ELSEIF}} scrn% = 12 {{Cl|THEN}}
-   {{Cl|SCREEN (statement)|SCREEN}} 12              '4 bit(16 colors) only
+   {{Cl|SCREEN}} 12              '4 bit(16 colors) only
    {{Cl|LINE}} (0, 0)-(639, 479), 13, BF
    {{Cl|LINE}} (100, 100)-(500, 400), 12, BF
    {{Cl|CIRCLE}} (320, 240), 100, 11
    {{Cl|PAINT}} {{Cl|STEP}}(0, 0), 9, 11
-   Start! = {{Cl|TIMER}}
+   Start! = {{Cl|TIMER (function)|TIMER}}
    FourBIT 0, 0, 639, 479, "Purple4"  '469, 239
 {{Cl|ELSE}} : {{Cl|SYSTEM}}
 {{Cl|END IF}}
-Finish! = {{Cl|TIMER}}  'elapsed times valid for QB only
+Finish! = {{Cl|TIMER (function)|TIMER}}  'elapsed times valid for QB only
 {{Cl|PRINT}} "Elapsed time ="; Finish! - Start!; "secs."; "Press Escape to quit!"
 {{Cl|DO}}: K$ = {{Cl|INKEY$}}: {{Cl|LOOP}} {{Cl|UNTIL}} K$ <> ""
@@ Line 126: / Line 138: @@
    {{Cl|FOR}} x = x1% {{Cl|TO}} x2%
      a$ = {{Cl|CHR$}}({{Cl|POINT}}(x, y))
-     Colors8%({{Cl|ASC}}(a$)) = 1
+     Colors8%({{Cl|ASC (function)|ASC}}(a$)) = 1
      {{Cl|PUT}} #f%, , a$
    {{Cl|NEXT}} x
@@ Line 237: / Line 249: @@
 {{CodeEnd}}
+=== More Examples ===
+* [[SaveImage SUB]]
+* [[ThirtyTwoBit SUB]]
+* [[Bitmaps]]
-''See Examples:''
-*[[SAVEIMAGE]] (QB64 full screen Image to Bitmap SUB by Galleon)
-* [[ThirtyTwoBit SUB]] (QB64 saves partial Image area to bitmap)
-*[[Bitmaps]]
-''See also:''
+{{PageSeeAlso}}
 * [[_LOADIMAGE]]
 * [[POINT]], [[PUT]]
+{{PageReferences}}
-{{PageNavigation}}

Program ScreenShots: Difference between revisions

Latest revision as of 13:30, 19 November 2024

Contents

Syntax

Description

Examples

More Examples

See also

QB64 Programming References

Navigation menu

Program ScreenShots: Difference between revisions

Latest revision as of 13:30, 19 November 2024

Syntax

Description

Examples

More Examples

See also

QB64 Programming References

Navigation menu

Search