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44 lines
1.9 KiB
Plaintext
44 lines
1.9 KiB
Plaintext
The '''VIEW''' statement creates a graphics view port area by defining the coordinate limits to be viewed.
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{{PageSyntax}}
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:: '''VIEW''' [[SCREEN] (column1, row1)-(column2, row2)[, color][, border]]]
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* When the SCREEN option is used, all coordinates are absolute and only graphics within the viewport area are plotted.
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* When the SCREEN option is not used, all coordinates are relative to the view port with the values of column1 and row1 being automatically added before plotting the point.
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* Coordinate values are for the top left and bottom right values of a box area of the screen mode used.
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* The color parameter specifies a background fill color for the area. None when omitted.
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* Border requires any valid color attribute to draw a line around the VIEW area if there is room for it.
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* VIEW without any parameters disables the previous viewport. [[RUN]] and [[SCREEN]] can also disable any VIEW port.
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* [[CLS]] or [[CLS|CLS 1]] clears the active graphics VIEW port area only. Disable a viewport before attempting to clear the entire screen!
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* '''Note: QB64 [[RUN]] statements will not close [[VIEW PRINT]], [[VIEW]] or [[WINDOW]] view ports presently!'''
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''Example 1:'' Using SCREEN option with absolute screen coordinates.
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{{CodeStart}}
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SCREEN 12
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VIEW SCREEN (200, 200)-(400, 400), 1, 9 ' blue BG with light blue border
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CIRCLE (220, 220), 20, 11 ' using the actual screen coordinates
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{{CodeEnd}}
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''Example 2:'' Using coordinates relative to the viewport box area.
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{{CodeStart}}
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SCREEN 12
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VIEW (200, 200)-(400, 400), 1, 9
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CIRCLE (20, 20), 20, 11 ' using coordinates inside of the viewport
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{{CodeEnd}}
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:''Explanation:'' The relative coordinates are automatically adjusted to place the object correctly. Any values outside of the box's area will not be displayed. Both examples should display the same screen image.
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''See also:''
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* [[VIEW PRINT]] {{text|(text view port)}}
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* [[WINDOW]] {{text|(window view port)}}
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* [[SCREEN]], [[CLS]]
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{{PageNavigation}}
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