Problems with setColor and drawLine

Posted on Tue 3rd, December 2019

• #1

What am I doing wrong here?

Bangle.setLCDMode();                                // use normal display mode
  g.clear();

  const Width = g.getWidth();
  const Height = g.getHeight();
  
  for (let x = 0; x < Width; x++) {
    g.setColor(x,0,0);
    g.drawLine(x,0, x,Height-1);
  }

In the emulator, the screen is filled with a constant red color - and not the gradient I would expect.

So where is the mistake?

Thanks in advance for any help!

Kind regards,

Andreas Rozek

• #2

Gordon

setColor takes values between 0 and 1, so I think everything is just clipped to maximum red :)

• #3

Andreas_Rozek

Indeed,

my mind was simply too "embedded"...the following works as expected:

  Bangle.setLCDMode();                                // use normal display mode
  g.clear();

  const Width = g.getWidth();
  const Height = g.getHeight();
  
  for (let x = 0; x < Width; x++) {
    let Color = x/Width;
    g.setColor(Color,0,0);
    g.drawLine(x,0, x,Height-1);
  }

Thank you very much for your help!

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Problems with setColor and drawLine

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Problems with setColor and drawLine

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Problems with setColor and drawLine

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Problems with setColor and drawLine

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