TFT LCD Screensaver?

JaDaveIII

• December 20, 2021 09:23

I am looking for actual example code for the Stencil function. The one quasi example shown in the FT800 Series Programmers Guide under "Stencil_Func" goes unexplained and some of the functions refer their parameters to other sections that are just general guides and do not explain the codes.

The real world problem I would like to solve is to use Stencil to put white letters / numbers on a already generated background that may be of any color.

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• 

  JaDaveIII

  • December 21, 2021 11:48

  In fact, I am looking for documentation about all the functions. Not just the FT800 Programmers Guide.pdf as it only shows functions & parameter values.
  
  Some document that actually describes from soup-to-nuts. For example:
  
  How to draw a line
  ===========
  
   Set the background color with XXXXXXX command, set the line draw color with ZZZZZ command
   Set the line height and width with the AAAAA and BBBB commands
   Start the line draw function with Begin(FT.lines) command
   Set the starting point with the first of two Vertex2ii(xpos,ypos,0,0) commands, the next Vertex2ii command will set the end point.
   repeat  2 Vertex2ii commands for every line
   end the function with End() command.
  
  Example:

  LineWidth(24)      // set the width of a line
  LineHeight(2)       // set the height of a line
  ColorRGB(255,0,255)  // set the color of the line or other thing to be drawn
  Begin(FT_LINES)        // start the line draw
  Vertex2ii(1,1,0,0)       // start point
  Vertex2ii(1,10,0,0)     // end point
  
  // repeat Vertex2ii pairs for more lines. Also you can change the color and size at will.
  End()                        // all done drawing.
  
  // note - this does not show the Display list commands needed to actual render the line to the display. For that see ZZZZZZ
  
  

  Explanation: The above draws a single line from 1,1 to 1,10 with a color of magenta on the current background color. The height of the line is 2 pixels and the ends will be rounded with a radius of 24 pixels.
  
  ---------------------------------------------------------------------------------
  
  Or Whatever. Not saying that my example is correct, but rather how to actually write documentation that is useful. So, does this exist anywhere?

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• 

  Ted M.

  NHD Staff

  • December 30, 2021 10:23

  Hi JaDaveIII,
  
  Bridgetech shows some examples on using Stencils in a few demo applications they developed.
  
  DemoMeterDemo – Bitmaps & Stencil techniques are used to create an interactive knob and meter.
  DemoRefrigeratior –This application demonstrates a Smart Refrigerator application using inbuilt fonts, stencil operation and the scissor command implemented on the EVE platform.
  DemoRotaryDial – Points, Track & Stencil functions are used to demonstrate an interactive rotary dial.
  
  These Demo files can be found on their website from https://brtchip.com/softwareexamples-eve/
  Download the project file EveApps.v1.2-rc3.zip that contains all of the Demo Applications from the link to "EVE Sample Applications"
  
  Best Regards,

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