| font | The font object to use to render the text. An invalid object will result in a line font being used. |
| pointSize | The font height in pixels (of the virtual screen) |
| margin | The space between the edge of the layer and the text. |
| center | The center of the layer. It determines the location of the rectangle in the screen's virtual coordinate system. |
| extent | The extent of the layer. It indicates its width and height in the screen's virtual coordinate system. |
| alignment | The alignment of the layer. It determines the location of the origin of the layer's local coordinate system. An alignment of (0,0) places the origin at the bottom left of the layer and an alignment of (1,1) places it at the top right. |
| isAlwaysTop | If true, the layer is treated in a special way by the screen. It will always be rendered last (i.e. appear on top). |
| color | The color of the rendered log text. |
