When drawing lines with GUI_Draw_AA_Line, spikes appear at the joints

Excalibur · July 26, 2023 at 5:09 AM

Hello，
When I joined the lines using the draw function in emWin, I noticed that there were some small spikes at the joints, as shown in the figure. Is there any way I can eliminate them? Does the GUI_DrawGraph interface in the manual allow you to change the size of a line?

SEGGER - Schoenen · July 31, 2023 at 1:07 PM

Hi,

This is most likely because the lines do overlap each other. Unfortunately, there is no way to avoid it.

You might try the SPLINE drawing operations:
https://www.segger.com/doc/UM03001_em…Drawing_splines
https://wiki.segger.com/Spline_(Sample)

Regards,
Sven

Excalibur · August 1, 2023 at 1:27 PM

Hi,

After trying to draw with SPLINE, the waveform data obtained is still not very satisfactory. This is a rendering using SPLINE. Is there any way I can eliminate the jagged center?

Excalibur · August 1, 2023 at 1:32 PM

create a SPLINE object in a dialog box and fill it wit data. I draw it in WM PAINT message. This is part of my source code.

When drawing lines with GUI_Draw_AA_Line, spikes appear at the joints

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