title: "vbmSetPosition1" description: TRSE built-in method (from IDE help)

`vbmSetPosition1`

Systems: VIC20
Parameters: b,b

vbmSetPosition1( [x-byte], [y-byte] );

[x-byte] - X location in pixels
[y-byte] - Y location in pixels

Description

Sets the inbuilt zero page pointer called ScreenMemory to the address in the bitmap corresponding to the location for the given X and Y position. The built in variable called vbmX is set to a value between 0 and 7 which is the pre-shifted offset to use to correctly display a sprite.

There are three vbmSetPosition commands, one for each type of pre-shifted sprites you wish to use:

vbmSetPosition1 - for sprites that are pre-shifted 1 pixel at a time
vbmSetPosition2 - for sprites that are pre-shifted 2 pixels at a time
vbmSetPosition4 - for sprites that are pre-shifted 4 pixels at a time

Ensure you use the correct command for your pre-shifted sprites.

Example


    // assume using 1 pixel pre-shifted sprites, therefore a total of 8 pre-shifted positions

    vbmSetPosition1( 35, 100 );
    vbmDrawSprite8( sprLeftSide, sprRightSide ); // 8x8 sprites need two character columns

    vbmSetPosition1( 100, 100 );
    vbmDrawSprite16( sprLeftSide, sprMiddle, sprRightSide ); // 16x16 sprites need three character columns

vbmSetPosition1