vbmClearTileMap

vbmClearTileMap( [address-map], [address-chars], [byte-X1], [byte-Y1], [byte-X2], [byte-Y2] );

• [address-map] - Address of the tilemap
• [address-chars] - Address of the tile characters
• [byte-X1] - Column on bitmap to start drawing
• [byte-Y1] - Y pixel position on bitmap to start drawing
• [byte-X2] - Column on bitmap to end drawing
• [byte-Y2] - Y pixel position on bitmap to end drawing

Description

Draws a tilemap on the bitmap. The map can be any size but the co-ordinates on the bitmap must equal the width and height of the map.

X1 and X2 are columns which equate directly to the bytes in the map data. X2 = X1 + width of tilemap.

Y1 and Y2 are pixel positions on the bitmap. Y2 = Y1 + (height of tilemap * 8)

There are four ways to draw a tilemap:

• vbmDrawTileMap - draws a tilemap overwriting the bitmap
• vbmDrawTileMapO - draws a tilemap merging with the bitmap
• vbmDrawTileMapE - draws a tilemap merging with EOR operation
• vbmClearTileMap - Cuts out the tilemap from the bitmap

Example

tiles: incbin("tiles.bin", $4000); // tiles / characterset map: incbin("tilemap.bin", $4050); // a full screen tilemap 20 x 24 map10: incbin("tilemap10x10.bin", $4230); // a small tilemap 10 x 10 ... vbmClearTileMap( map, tiles, 0, 0, 20, 184 ); // draw a full screen tilemap vbmClearTileMap( map10, tiles, 5, 100, 15, 172 ); // draw a smaller tilemap