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57 lines
3.3 KiB
Plaintext
57 lines
3.3 KiB
Plaintext
The [[LOCATE]] statement locates the screen text row and column positions for a [[PRINT]] or [[INPUT]] procedure.
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{{PageSyntax}}
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: [[LOCATE]] [{{Parameter|row%}}][, {{Parameter|column%}}] [, {{Parameter|cursor%}}][, {{Parameter|cursorStart%}}, {{Parameter|cursorStop%}}]
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{{Parameters}}
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* optional text {{Parameter|row%}} [[INTEGER]] values are from 1 to 25, 43 or 50 in [[SCREEN]] 0 and 25 in most other legacy graphic screen modes, except screens 11 and 12 which can have 30 or 60 rows.
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* optional {{Parameter|column%}} [[INTEGER]] values are from 1 to 40 or 80 in [[SCREEN]] 0 and 80 in all other legacy screen modes.
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* optional {{Parameter|cursor%}} value can be 0 to turn displaying the cursor off or 1 to turn it on.
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* optional {{Parameter|cursorStart%}} and {{Parameter|cursorStop%}} values define the shape of the cursor by setting the start and stop scanline (values range from 0 to 31) for the cursor character.
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{{PageDescription}}
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* [[WIDTH]] statement can be used to determine the text width and height in [[SCREEN]] 0 and height of 30 or 60 in [[SCREEN]] 11 or 12.
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* In [[_NEWIMAGE]] graphic screen the number of text ''rows'' are calculated as [[_HEIGHT]] \ 16 except when a [[_FONT]] is used. Use [[_FONTHEIGHT]] to calculate font rows.
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* [[_NEWIMAGE]] graphic screen text ''columns'' are calculated as [[_WIDTH (function)|_WIDTH]] \ 8 except when a [[_FONT]] is used. Use [[_PRINTWIDTH]] to measure a line of font text.
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* The text ''row'' position is not required if the [[PRINT]] is going to be on the next row. The [[comma]] and a ''column'' value are required to set the column.
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* If only the ''row'' parameter is given, then the column position remains the same. '''Neither ''row'' or ''column'' parameter can be 0.'''
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* When [[PRINT]]ing on the bottom 2 ''rows'', use a [[semicolon]] after the PRINT expression to avoid a screen roll.
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* If the {{Parameter|cursorStart%}} line is given, the {{Parameter|cursorStop%}} line must also be given. A wider range between them produces a taller cursor.
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* If you use LOCATE beyond the current number of rows in text mode, QB64 will try to adapt the screen instead of tossing an error.
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{{PageExamples}}
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''Example:'' Moving the cursor around (now you can finally create a Commodore 64 emulator!). '''Default SCREEN 0 only:'''
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{{CodeStart}} '' ''
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crx = 10
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cry = 10
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DO
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{{Cl|LOCATE}} cry, crx, 1, 0, 8
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a$ = {{Cl|INKEY$}}
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{{Cl|SELECT CASE}} a$
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{{Cl|CASE}} {{Cl|CHR$}}(0) + "H": {{Cl|IF...THEN|IF}} cry > 1 {{Cl|THEN}} cry = cry - 1 'up
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{{Cl|CASE}} {{Cl|CHR$}}(0) + "P": {{Cl|IF...THEN|IF}} cry < 25 {{Cl|THEN}} cry = cry + 1 'down
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{{Cl|CASE}} {{Cl|CHR$}}(0) + "K": {{Cl|IF...THEN|IF}} crx > 1 {{Cl|THEN}} crx = crx - 1 'left
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{{Cl|CASE}} {{Cl|CHR$}}(0) + "M": {{Cl|IF...THEN|IF}} crx < 80 {{Cl|THEN}} crx = crx + 1 'right
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{{Cl|CASE}} {{Cl|CHR$}}(27): {{Cl|END}}
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{{Cl|END SELECT}}
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LOOP '' ''
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{{CodeEnd}}
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: Explanation: The CHR$(0) + "H", "P", "K", "M" represents the cursor arrow keys. start = 0, stop = 8 is the tallest cursor, experiment with the start and stop values for different effects (start = 8, stop = 8 is the default producing a _ cursor).
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{{PageSeeAlso}}
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* [[CSRLIN]], [[POS]] {{text|(cursor position)}}
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* [[SCREEN]], [[PRINT]], [[COLOR]]
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* [[INPUT]], [[LINE INPUT]], [[INPUT$]] {{text|(keyboard input)}}
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* [[WIDTH]], [[INPUT$]], [[INKEY$]]
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{{PageNavigation}}
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