Convex Shape issue

[wiiqwertyuiop]

I am trying to do some rotation on a object constructed of triangles. For the most part, this works. The issue I am having is at certain points, some of the convex shapes form a "line", and SFML seems to not like it or something. Here is the code I am using:

        sf::ConvexShape drawObj;

        drawObj.setPointCount(3);
        drawObj.setFillColor(sf::Color::Transparent);
        drawObj.setOutlineColor(sf::Color::White);
        drawObj.setOutlineThickness(2.0f);

        drawObj.setPoint(0, sf::Vector2f(249, 258));
        drawObj.setPoint(1, sf::Vector2f(353, 257));
        drawObj.setPoint(2, sf::Vector2f(529, 258));

        window.draw(drawObj);

which produces:



If I modify the middle point so it is further out (257 -> 275), it becomes more "normal":



I'm wondering what the problem is here, or what can be done about this.

[kojack]

The top shape is correct for the coordinates you gave.
The middle point is only 1 pixel higher (at 257) than the left and right points (each at 258), so it will look like a line.

[wiiqwertyuiop]

My only question is why does it go across the whole screen? I'm trying to make it maintain the size.

[texus]

It's related to the outline thickness, see https://github.com/SFML/SFML/issues/2727 and https://github.com/SFML/SFML/pull/2741

[wiiqwertyuiop]

That's awesome thanks texus! For now I've switched to using sf::Vertex, since I've noticed this bug isn't present there. But good to know there is a fix for it!