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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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144 lines
5.3 KiB
Plaintext
144 lines
5.3 KiB
Plaintext
The '''PRESET''' graphic [[SCREEN]] statement turns a pixel at a coordinate to the background color or a designated color attribute.
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{{PageSyntax}}
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:: '''PRESET''' [STEP]'''('''''column%'', ''row%''''')'''[, colorAttribute]
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''[[Parameters]]:''
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* Can use [[STEP]] when relative graphics coordinates are required.
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* ''column'' and ''row'' coordinates can be literal ot variable [[INTEGER]] values which can be offscreen.
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* If the ''colorAttribute'' is omitted, PRESET will use the current [[_DEST|destination]] page's [[_BACKGROUNDCOLOR]].
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''Usage:''
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* Color attributes are limited to those available in the [[SCREEN]] mode used. [[PSET]] can be used to adopt previously used colors.
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* Any color value other than 0 will be white in monochrome [[SCREEN]] modes 2 and 11 where the [[COLOR]] statement cannot be used.
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* PRESET can invisibly locate other graphics objects like [[CIRCLE]]s and add color to subsequent graphic objects and [[DRAW]] when used.
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* The PRESET action can be used in a graphics [[PUT (graphics statement)|PUT]] to produce a color inverted image on any background. See Example 2.
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* The graphic cursor is set to the center of the program window on program start for [[STEP]] relative coordinates.
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* '''PRESET can be used in any graphic screen mode, but cannot be used in the default screen mode 0 as it is text only!'''
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''Example 1:'' Using PRESET to locate a [[DRAW]] statement that draws a box that is bright red.
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{{CodeStart}} '' ''
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SCREEN 12
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{{Cl|PRESET}}(100, 100)
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{{Cl|DRAW}} "C12 U20 R20 D20 L20" '' ''
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{{CodeEnd}}
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:''Explanation:'' The [[DRAW]] string required a color designation as PRESET defaulted to the black background color.
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''Example 2:'' Displays the flags of countries that use simple horizontal or vertical color blocks with a highlighted arrow key menu.
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{{CodeStart}} '' ''
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{{Cl|DIM}} {{Cl|SHARED}} c$(21), x$(21), gg%(477)
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ARRAY
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SETUP
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SELECTION
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TERMINATE
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{{Cl|END}}
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{{Cl|SUB}} ARRAY
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c$(1) = "Armenia H040914"
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c$(2) = "Austria H041504"
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c$(3) = "Belgium V001404"
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c$(4) = "Bulgaria H150204"
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c$(5) = "Chad V011404"
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c$(6) = "C“te D'Ivoire V061502"
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c$(7) = "Estonia H090015"
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c$(8) = "France V011504"
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c$(9) = "Germany H000414"
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c$(10) = "Hungary H041502"
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c$(11) = "Ireland V021506"
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c$(12) = "Italy V021504"
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c$(13) = "Lithuania H140204"
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c$(14) = "Luxembourg H041509"
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c$(15) = "Mali V021404"
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c$(16) = "Netherlands H041501"
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c$(17) = "Nigeria V021502"
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c$(18) = "Romania V091404"
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c$(19) = "Russia H150104"
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c$(20) = "Sierra Leone H021509"
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c$(21) = "Yemen H041500"
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{{Cl|END SUB}}
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{{Cl|SUB}} DISPLAY.FLAG (calc%)
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f% = {{Cl|VAL}}({{Cl|MID$}}(x$(calc%), 2, 2))
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s% = {{Cl|VAL}}({{Cl|MID$}}(x$(calc%), 4, 2))
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t% = {{Cl|VAL}}({{Cl|MID$}}(x$(calc%), 6, 2))
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{{Cl|IF...THEN|IF}} {{Cl|LEFT$}}(x$(calc%), 1) = "V" {{Cl|THEN}}
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{{Cl|LINE}} (120, 225)-(253, 465), f%, BF
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{{Cl|LINE}} (254, 225)-(385, 465), s%, BF
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{{Cl|LINE}} (386, 225)-(519, 465), t%, BF
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{{Cl|END IF}}
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{{Cl|IF...THEN|IF}} {{Cl|LEFT$}}(x$(calc%), 1) = "H" {{Cl|THEN}}
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{{Cl|LINE}} (120, 225)-(519, 305), f%, BF
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{{Cl|LINE}} (120, 306)-(519, 386), s%, BF
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{{Cl|LINE}} (120, 387)-(519, 465), t%, BF
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{{Cl|END IF}}
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{{Cl|END SUB}}
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{{Cl|SUB}} SELECTION 'menu selection using arrow keys
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x% = 2: y% = 4
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DO
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{{Cl|WHILE}} (x% <> prevx% {{Cl|OR (boolean)|OR}} y% <> prevy%) {{Cl|AND (boolean)|AND}} k$ <> {{Cl|CHR$}}(27)
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k$ = {{Cl|INKEY$}}
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x% = x% + (k$ = ({{Cl|CHR$}}(0) + "K") {{Cl|AND (boolean)|AND}} x% > 1) + {{Cl|ABS}}(k$ = ({{Cl|CHR$}}(0) + "M") {{Cl|AND (boolean)|AND}} x% < 3)
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y% = y% + (k$ = ({{Cl|CHR$}}(0) + "H") {{Cl|AND (boolean)|AND}} y% > 1) + {{Cl|ABS}}(k$ = ({{Cl|CHR$}}(0) + "P") {{Cl|AND (boolean)|AND}} y% < 7)
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calc% = (x% - 1) * 7 + y%: {{Cl|LOCATE}} 14, 18: {{Cl|PRINT}} c$(calc%); {{Cl|SPACE$}}(10)
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x1% = 140 + (x% - 1) * 128
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x2% = x1% + {{Cl|LEN}}(c$(calc%)) * 8 + 7
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y1% = 48 + y% * 16
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{{Cl|IF...THEN|IF}} x1% <> prevx1% {{Cl|OR (boolean)|OR}} y1% <> prevy1% {{Cl|THEN}}
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{{Cl|IF...THEN|IF}} g% {{Cl|THEN}} {{Cl|PUT (graphics statement)|PUT}}(prevx1%, prevy1%), gg%(), {{Cl|PSET}}
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{{Cl|GET (graphics statement)|GET}}(x1%, y1%)-(x2%, y1% + 16), gg%(): g% = 1
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{{Cl|PUT (graphics statement)|PUT}}(x1%, y1%), gg%(), {{Cl|PRESET}}
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prevx1% = x1%: prevx2% = x2%: prevy1% = y1%
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DISPLAY.FLAG calc%
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{{Cl|END IF}}
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{{Cl|WEND}}
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{{Cl|LOOP}} {{Cl|UNTIL}} k$ = {{Cl|CHR$}}(27)
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{{Cl|END SUB}}
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{{Cl|SUB}} SETUP
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{{Cl|SCREEN}} 12
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{{Cl|COLOR}} 6
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c% = 1
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{{Cl|FOR...NEXT|FOR}} x% = 11 {{Cl|TO}} 50 {{Cl|STEP}} 16
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{{Cl|FOR...NEXT|FOR}} y% = 1 {{Cl|TO}} 7
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x$(c%) = {{Cl|RIGHT$}}(c$(c%), 7)
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c$(c%) = {{Cl|RTRIM$}}({{Cl|LEFT$}}(c$(c%), {{Cl|LEN}}(c$(c%)) - 7))
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{{Cl|LOCATE}} y% + 4, x% + 8: {{Cl|PRINT}} c$(c%)
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c% = c% + 1
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{{Cl|NEXT}} y%, x%
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{{Cl|COLOR}} 11: {{Cl|LOCATE}} 3, 20: {{Cl|PRINT}} "Use the Cursor Keys to Select a Country:"
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{{Cl|LINE}} (119, 224)-(520, 466), 7, B
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{{Cl|END SUB}}
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{{Cl|SUB}} TERMINATE
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{{Cl|FOR...NEXT|FOR}} c% = 1 {{Cl|TO}} 219
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{{Cl|LINE}} (116 + c%, 29 + c%)-(523 - c%, 469 - c%), 0, B
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{{Cl|NEXT}}
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{{Cl|END SUB}}
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{{CodeEnd}}{{small|Code by AlGoreIthm}}
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: ''Explanation:'' Using the [[PUT (graphics statement)|PUT]] PRESET action highlights the menu selection in graphic screen modes by returning a negative image.
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''See also:''
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* [[PUT (graphics statement)]]
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* [[GET (graphics statement)]]
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* [[CIRCLE]], [[LINE]], [[PSET]]
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{{PageNavigation}}
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