Circle draws a circle, slice, or an arc with the following attributes:
x: The horizontal position of the circle's center relative to the upper left corner of the background (0, 0). The default is zero.
y: The vertical position of the circle's center relative to the upper left corner of the background (0, 0). The default is zero.
radius: The circle's radius. The default is 100.
start: To draw a complete circle, omit this attribute. To draw a slice, this determines the starting angle of the slice. A slice is rendered clockwise from the start to the end angle. Angle zero is at the 12 o'clock position. A full circle is 360 degrees. You may use values below 0 and over 360, but the end value must be larger then the start value. The default is 0.
end: To draw a complete circle, omit this attribute. To draw a slice, this determines the ending angle of the slice. A slice is rendered clockwise from the start to the end angle. Angle zero is at the 12 o'clock position. A full circle is 360 degrees. You may use values below 0 and over 360, but the end value must be larger then the start value. The default is 360.
fill_color: The color inside the circle. This is a string holding triple hexadecimal values representing the red, green, and blue components of a color. The default is "000000" (black).
fill_alpha: The transparency value inside the circle. Valid values range from 0 (fully transparent) to 1 (fully opaque). The default is 1.
line_color: The border's color. This is a string holding triple hexadecimal values representing the red, green, and blue components of a color. The default is "000000" (black).
line_alpha: The border's transparency value. Valid values range from 0 (fully transparent) to 1 (fully opaque). The default is 1.
line_thickness: The border's thickness. The default is 0 pixels.
Example
<slickboard>
<!-- draw a red circle with a transparent green outline -->
<circle x='125'
y='125'
radius='75'
fill_color='ff4400'
fill_alpha='1'
line_color='88ff00'
line_alpha='.5'
line_thickness='10'
/>
<!-- draw a circle with just a white outline -->
<circle x='175'
y='75'
radius='50'
fill_alpha='0'
line_color='ffffff'
line_alpha='.9'
line_thickness='10'
/>
<!-- draw a blue slice -->
<circle x='250'
y='100'
radius='100'
start='45'
end='90'
fill_color='4400ff'
fill_alpha='.9'
line_thickness='0'
/>
<!-- draw a green arc-->
<circle x='250'
y='225'
radius='100'
start='0'
end='90'
fill_alpha='0'
line_color='88ff00'
line_alpha='.9'
line_thickness='20'
/>
</slickboard>
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