TImageEnView.Zoom

Declaration

property Zoom: double;

Description

Use the Zoom property to zoom in or out of the image. The image itself is not modified, only its display size changes.
Zoom is expressed as a percentage of its native size, i.e. 100 is normal size, values less than 100 decrease the display size and values greater than 100 increase the display size.

Note:
◼Zoom will only have a temporary effect if AutoShrink or AutoStretch is enabled, unless you add iedoDisableAutoFitWhenZoom to DisplayOptions
◼Use ZoomFilter to improve the quality when zooming
◼By default, scrolling the mouse wheel will zoom the view. You can limit the bounds of the zoom using OnZoomIn and OnZoomOut

See Also

◼ZoomX
◼ZoomY
◼ZoomIn
◼ZoomOut
◼OnZoomIn
◼OnZoomOut

Examples

// Half size: a 200x200 pixel image is displayed at a size of 100x100
ImageEnView.Zoom := 50;

// Double size: a 200x200 pixel image is displayed at a size of 400x400
ImageEnView.Zoom := 200;

// floating point zoom
ImageEnView.Zoom := 30.25;

// Show image zoom based on its DPI
// Note: More accurately you should get the PPI for the display monitor (e.g. Form.CurrentPPI)
Caption := IntToStr( Round( ImageEnView1.Zoom / ImageEnView1.IO.Params.Dpi * Screen.PixelsPerInch )) + '%';

// Display image at 100% based on its DPI
// Note: More accurately you should get the PPI for the display monitor (e.g. Form.CurrentPPI)
ImageEnView1.Zoom := ImageEnView1.IO.Params.Dpi / Screen.PixelsPerInch * 100;

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