代码说明： 功能强大而易于使用的打印/预览组件 TGmPrinter is an easy-to-use but powerful print/preview component with the following features: Full page preview with the abilits to show margins and a variable shadow using any colour Preview navigation (First, Prev, Next and Last page commands) Add page headers and footers ?visible at design time Use header and footer tokens ?e.g. {DATE} and {TIME} and let the component fill in the respective values before printing Draw lines, rectangles ellipses, text and images at a position specified in Millimetres in any font/colour/brush etc. Draw grids by specifying the grid area, rows and no. of columns Place text of any font/colour/size at any position on the page using Millimetre Coordinates Zoom in or out by changing the zoom percent Obtain printer information such as margin sizes and physical & available page width

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