Printing data on display

[hugowaals]

Good day,

I assume that my question is simple, but I don't know the solution: For example, when I want to display a float (tft.drawFloat(xxx,3,90,140);) that works fine, but the next print in the same place does not clear the field first. How can I make sure this happens?

Many thanks in advance,
Hugo

[Bodmer]

It depends which font you are using. Most fonts allow a background colour to be specified. The setTextPadding() function can also be used to pad out the backgrounbd zone to a specified width in pixels. Some examples demonstrate this.

Example code:

  // Set text padding to 100 pixels wide area to over-write old values on screen
  tft.setTextPadding(100);
  tft.setTextColor(TFT_WHITE, TFT_BLUE);
  for (int i = 0; i <= 20; i++) {
    tft.drawFloat(i / 10.0, 1, xpos, ypos);
    delay (200);
  }

[hugowaals]

Many thanks!!