Unit IsFmxGraphics

 

Contains two classes

•TIsGraphics

•TNavGraphics

 

 

TIsGraphics

A general base class to set up a canvas.

Private

  SizeCanvasFont

 Protected

   ClearCanvas

   PointOutsideBounds

   DrawHorizontalScaleBar;

   DrawVerticalScaleBar;

   RectangleToPath

   AddText

 Public

  SetNewImageBitMap  

Returns True if the bitmap in an image has been (re) created

 

 

TNavGraphics

Inherits from TIsGraphics and converts Latitude and Longitude  references into plot point on the canvas. Does not handle International dateline

 Private

  NavAsPoint:

Returns a scaled plot point TPointf from Navigation References

  AddScale:

Adds a scale bar to the Canvas- Determines size from the Degrees to Pixels scale passed in

 Public

  GetScale:

Takes a list of Lat/Long Records and a canvas and returns the degrees to pixel scale factors required to plot the points. It also returns the center of the points provided as Pixels (CenterOffset) and Lat/Long (Origin)

  RelocateNavPointFromMapRef

Takes a RNavigateLongLat Record and calculates a new value based on the original map x,y pixel reference, the map scale and a desired position given in Map x,y pixel coordinates

  DrawLocationsOnCanvas

Takes a list of Lat/Long Records and plots the values on a canvas. Accepts a Header Text and a scale bar V/H option. Can be made to attempt to smooth out jitter by setting the Jitter parameter