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<p>PS: Try this</p>
<pre><font face="monospace">
cairo_set_source_rgb(state->cr, 1.0, 0.0, 0.0);
cairo_translate(state->cr, 500, 500);
cairo_rotate(state->cr, M_PI / 4);
cairo_translate(state->cr, -500, -500);
cairo_rectangle(state->cr, 400, 400, 200, 200);
double x0, y0, x1, y1;</font><font face="monospace"><font face="monospace">
</font></font></pre>
<pre><font face="monospace"><font face="monospace"> cairo_identity_matrix(state->cr);</font>
</font></pre>
<pre><font face="monospace"> cairo_fill_extents(state->cr, &x0, &y0, &x1, &y1);
cairo_fill(state->cr);
...
</font></pre>
<div class="moz-cite-prefix">Am 17.04.2021 um 22:15 schrieb Heiko
Lewin:<br>
</div>
<blockquote type="cite"
cite="mid:6de59349-03a9-d137-bb26-37b37e69c87a@gmx.de">
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<p>Hello!</p>
<p>The _entents-functions return coordinates in the current
user-coordinate-system, that is the same transform as when
drawing the rectangle needs to be applied for meaningful
results.</p>
<div class="moz-cite-prefix">Am 17.04.2021 um 22:03 schrieb Moazin
K:<br>
</div>
<blockquote type="cite"
cite="mid:CABgJyi5XzJqK5CcNf+hwNzDJNCeQDmO0CNJdHreK1OSR0hQAHA@mail.gmail.com">
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<div class="gmail_quote">
<div dir="ltr">Hi all,
<div><br>
</div>
<div>While playing with the `*_extents` functions of
Cairo, I discovered that `cairo_fill_extents` and
`cairo_stroke_extents` give slightly poor results when a
rotation transform has been applied on the path.</div>
<div><br>
</div>
<div>My code is pretty simple:</div>
<div><br>
</div>
<div><font face="monospace">
cairo_set_source_rgb(state->cr, 1.0, 0.0, 0.0);<br>
cairo_translate(state->cr, 500, 500);<br>
cairo_rotate(state->cr, M_PI / 4);<br>
cairo_translate(state->cr, -500, -500);<br>
cairo_rectangle(state->cr, 400, 400, 200, 200);<br>
double x0, y0, x1, y1;<br>
cairo_fill_extents(state->cr, &x0, &y0,
&x1, &y1);<br>
cairo_fill(state->cr);<br>
<br>
cairo_identity_matrix(state->cr);<br>
cairo_set_source_rgb(state->cr, 0.0, 0.0, 1.0);<br>
cairo_set_line_width(state->cr, 1);<br>
cairo_rectangle(state->cr, x0, y0, x1 - x0 + 1,
y1 - y0 + 1);<br>
cairo_stroke(state->cr);</font><br>
</div>
<div><br>
</div>
<div>Extents come out to be:</div>
<div>[x0 y0 x1 y1] -> [299.999266 299.999266 700.000734
700.000734]<br>
</div>
<div><br>
</div>
<div>The picture `cairo-rotate-problem.png` visualizes
this. I think the result should be as shown in
`cairo-rotate-problem-right-result-imho.png`. Please
tell me if this is the expected behavior or a bug or
enhancement and I can appropriately create an issue on
the Gitlab issue tracker.</div>
<div><br>
</div>
<div>It didn't make sense to me why the function behaves
this way, when calculating the tight bounds is actually
easy. I can get my desired results by removing the
transform, calculating extents and then transforming
those extents to get a quadrilateral on which I can fit
a rectangle to get the tight bounds.</div>
<div><br>
</div>
<div>Thank you,</div>
<div>Moazin</div>
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</font></div>
</div>
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