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54 lines
2.4 KiB
Plaintext
54 lines
2.4 KiB
Plaintext
The [[WINDOW]] graphics statement defines the coordinate dimensions of the current graphics view port or closes it.
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{{PageSyntax}}'''
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: '''WINDOW''' [[SCREEN] (''column1'', ''row1'')-(''column2'', ''row2'')]
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{{Parameters}}
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* If no statement parameters are used, the previous WINDOW view port area is disabled.
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* The SCREEN option inverts Cartesian row values to increase from negative to 0 to positive. Columns unchanged.
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* If the SCREEN option is not used, rows use the Cartesian system with highest row at top to lowest row at bottom.
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* Optional coordinate values redefine the [[SINGLE]] negative or positive port dimension values when desired.
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{{PageDescription}}
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* The statement allows a program to create a custom graphic coordinate system independent of the [[SCREEN]] mode used.
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* WINDOW dimensions can be greater than the [[SCREEN]] mode size to create larger images for pictures.
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* A [[VIEW]] statement can change the viewport area.
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* All subsequent graphics statements will use the new coordinate system.
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* Use [[CLS]] or [[CLS|CLS 1]] to clear the active WINDOW view port area.
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* [[RUN]] or a [[SCREEN (statement)|SCREEN]] statement will also disable the window viewport.
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* Note: '''QB64''' can create a custom sized window using [[_NEWIMAGE]].
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* '''Note: QB64 [[RUN]] statements will not close [[VIEW PRINT]], [[VIEW]] or [[WINDOW]] view ports presently!'''
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''Example:'' Using a WINDOW to amplify circle sizes. [[PMAP]] finds the corresponding WINDOW co-ordinates.
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{{CodeStart}}
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{{Cl|SCREEN}} 12
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{{Cl|WINDOW}} (0, 0)-(10, 10) 'uses Cartesian row co-ordinates
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{{Cl|PRINT}} "Click mouse to place a circle. Hit enter for next color."
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{{Cl|FOR...NEXT|FOR}} clr = 1 {{Cl|TO}} 15
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{{Cl|DO}}
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{{Cl|DO}}
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{{Cl|IF...THEN|IF}} {{Cl|_MOUSEBUTTON}}(1) {{Cl|THEN}}
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x! = {{Cl|PMAP}}({{Cl|_MOUSEX}}, 2) ' Convert mouse screen co-ordinates to window co-ordinates.
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y! = {{Cl|PMAP}}({{Cl|_MOUSEY}}, 3)
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{{Cl|CIRCLE}} (x!, y!), .2, clr
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{{Cl|PAINT}} {{Cl|STEP}}(0, 0), clr
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{{Cl|END IF}}
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{{Cl|LOOP}} {{Cl|WHILE}} {{Cl|_MOUSEINPUT}}
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{{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|INKEY$}} = {{Cl|CHR$}}(13)
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{{Cl|NEXT}} '' ''
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{{CodeEnd}}
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{{PageSeeAlso}}
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* [[PMAP]]
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* [[VIEW]] {{text|(graphics view port)}}
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* [[VIEW PRINT]] {{text|(text view port)}}
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* [[_NEWIMAGE]], [[_LOADIMAGE]]
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* [https://en.wikipedia.org/wiki/Cartesian_coordinate_system Cartesian coordinate system]
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{{PageNavigation}} |