VIEW
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The VIEW statement creates a graphics view port area by defining the coordinate limits to be viewed.
Syntax
- VIEW [[SCREEN] (column1, row1)-(column2, row2)[, [color][, border]]]
- When the SCREEN option is used, all coordinates are absolute and only graphics within the viewport area are plotted.
- 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.
- Coordinate values are for the top left and bottom right values of a box area of the screen mode used.
- The color parameter specifies a background fill color for the area. None when omitted.
- Border requires any valid color attribute to draw a line around the VIEW area if there is room for it.
- VIEW without any parameters disables the previous viewport. RUN and SCREEN can also disable any VIEW port.
- CLS or CLS 1 clears the active graphics VIEW port area only. Disable a viewport before attempting to clear the entire screen!
- Note: QB64 RUN statements will not close VIEW PRINT, VIEW or WINDOW view ports presently!
Example 1: Using SCREEN option with absolute screen coordinates.
SCREEN 12 VIEW SCREEN (200, 200)-(400, 400), 1, 9 ' blue BG with light blue border CIRCLE (220, 220), 20, 11 ' using the actual screen coordinates |
Example 2: Using coordinates relative to the viewport box area.
SCREEN 12 VIEW (200, 200)-(400, 400), 1, 9 CIRCLE (20, 20), 20, 11 ' using coordinates inside of the viewport |
- 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.
See also