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Description
Backcloth may be used passively to display a bitmap behind other controls (e.g. a drawing of plant configuration behind a plant control system). In this case, it would need the data variable only, probably giving the ‘name’ of a bitmap file.
Use 1 (=Tile) to make nice backgrounds, such as a grooved playing surface for a chess game.
A more active use would be to make a bitmap display where the mouse could be used to pick selected bits. When you select 2 (=Stretch) the co-ordinate system of the Backcloth is set automatically to match the bit pattern. Mouse actions are then reported as the (QuadIO+) bit position.
Class Property Table
| Name | Type | Default | Description |
| Hint | String | ||
| Style | ManyOf | ||
| Picture | Runtime | Bits array | |
| Placement | Runtime | Place (0=TopLeft; 1=Tile; 2=Stretch; 3=Centre) |