diff options
Diffstat (limited to 'html/en/func/filled.html')
| -rw-r--r-- | html/en/func/filled.html | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/html/en/func/filled.html b/html/en/func/filled.html index 2ae1083..97a2e84 100644 --- a/html/en/func/filled.html +++ b/html/en/func/filled.html @@ -63,25 +63,29 @@ canvas:fSector(xc, yc, w, h, angle1, angle2: number) [in Lua] canvas:wSector(xc, yc, w, h, angle1, angle2: number) (WC) [in Lua]</pre> <p>Fills the arc of an ellipse aligned with the axis, according to the current - interior style, in the shape of a pie. It is drawn counter-clockwise. The + interior style, in the shape of a pie. </p> +<p>The coordinate <b>(xc,yc)</b> defines the center of the ellipse. Dimensions <b>w</b> and <b>h</b> define the elliptic axes X and Y, respectively. </p> - <p>Angles <b>angle1</b> and <b>angle2</b>, in degrees, - define the arc's beginning and end, but they are not the angle relative to the + <p>Angles <b>angle1</b> and <b>angle2</b> are in degrees and oriented + counter-clockwise. They + define the arc start and end, but they are not the angle relative to the center, except when w==h and the ellipse is reduced to a circle. The arc - starts at the point <b>(xc+(w/2)*cos(angle1),yc+(h/2)*sin(angle1))</b> - and ends at <b>(xc+(w/2)*cos(angle2),yc+(h/2)*sin(angle2))</b>. A - complete ellipse can be drawn using 0 and 360 as the angles. </p> + starts at the point <b>(xc+(w/2)*cos(angle1), yc+(h/2)*sin(angle1))</b> + and ends at <b>(xc+(w/2)*cos(angle2), yc+(h/2)*sin(angle2))</b>. A + complete ellipse can be drawn using 0 and 360 as the angles. If <b>angle2</b> + is less than <b>angle1</b> it will be increased by 360 until it is greater + than <b>angle1</b>. </p> <p>The angles are specified so if the size of the ellipse (w x h) is changed, its shape is preserved. So the angles relative to the center are dependent - from the ellipse size. The actual angle can be obtained using <tt><b>rangle = - atan2((h/2</b></tt><b>)*sin(angle),(w/2)*cos(angle))</b>.</p> - <p>The angles are given in degrees. To specify the angle in radians, you can + from the ellipse size. The actual angle can be obtained using <b>rangle = + atan2((h/2)*sin(angle), (w/2)*cos(angle))</b>.</p> + <p>To specify the angle in radians, you can use the definition <font size="2"><strong>CD_RAD2DEG</strong></font> to multiply the value in radians before passing the angle to CD. </p> <p>When the interior style <font><strong>CD_HOLLOW</strong></font> is defined, - the function behaves like its equivalent <strong><font>cdArc</font></strong>, + the function behaves like its equivalent <strong><font>cdCanvasArc</font></strong>, plus two lines connecting to the center.</p> <p align="center"><font size="4">Sector Parameters</font><br> <img src="../../img/sector.gif" border="2" width="161" height="160"></p> |