PolygonFilled function works improperly

[k-word]

Please test this code:

var x[4] := [2, 6, 6, 2];
var y[4] := [2, 2, 6, 6];
gfx_PolygonFilled(4, x, y, RED);

It is supposed to produce a 5x5-pixel square located two pixels away from upper left corner in either direction.
Instead, it results in a 5x4-pixel rectangle, the first (upper) line of pixels missing.

Setting var yIN[4] := [1, 1, 6, 6]; does produce the desired result, but then the entire upper line of pixels (with y = 0) becomes inaccessible for this function...

Well, I have also tried var yIN[4] := [-1, -1, 5, 5];, and it works!

But, nevertheless, setting (x2 - x1) = (y2 - y1) must produce a square. So this function has a bug somewhere.

[ESPsupport]

Hmm, yeah.

The lowest Y values for a filled polygon are not produced.

This can be easily seen with

    gfx_Polygon(4, x, y, LIME);
    gfx_PolygonFilled(4, x, y, RED);

A quick workaround is

    gfx_OutlineColour(RED);                // 8  graphics rectangle/circle outline colour
    gfx_PolygonFilled(4, x, y, RED);

[k-word]

Thank you, I'll check this. But I'm actually interested in more complex shapes like arrows (they came out distorted, so I decided to test squares).
Do you think adding the outline will work for them as well?

[ESPsupport]

I think it will, by all means give it a try, and perhaps come back with a more complex example, it will help test the fix

[k-word]

Well, it works for a 7-point arrow. The gfx_Polygon function (outline only) works OK.

Thank you.