Paratick
Categories: generativepy generative art
The ParallelMarker class is a special Shape that adds a small arros marker to a line, of the type often used in geometric diagrams to show that two lines are parallel. They look like this:
You can add 1, 2 or 3 markers.
The TickMarker only draws the tick, it doesn't draw the line itself. This would normally be draw using a Line object, Polygon object, or similar.
ParallelMarker class
ParallelMarker is derived from the Shape class. It adds several methods:
of_start_endwith_lengthwith_countwith_gap
of_start_end
Creates a marker based on a start and end points.
of_start_end(a, b)
| Parameter | Type | Description |
|---|---|---|
| a | (number, number) | Tuple (x, y) for start of line |
| b | (number, number) | Tuple (x, y) for end of line |
This will draw an tick marker for the line formed by ab. The marker will be halfway between points a and b, and the arrow will point towards b.
with_length
Sets the length of the marker.
with_length(length)
| Parameter | Type | Description |
|---|---|---|
| length | number | Length of marker in user units. |
The default is 4.
with_count
Sets the number of arrows in the marker.
with_count(count)
| Parameter | Type | Description |
|---|---|---|
| count | int | Number of arrows |
This can be used to draw a single, double, or triple arrows. Permitted values are 1, 2, or 3. Default is 1.
with_gap
Sets the gap between the arrows if count > 1.
with_gap(gap)
| Parameter | Type | Description |
|---|---|---|
| gap | number | Gap between arrows in user units. |
Sets the spacing of the arrows. This is only relevant if there is more than one arrow (ie if count > 1), otherwise it is ignored. The default is 1.
paratick function
This older paratick function is deprecated as of GenerativePy 3.1.
paratick(ctx, a, b, count=1, length=4, gap=1)
| Parameter | Type | Description |
|---|---|---|
| ctx | Context | The Pycairo Context to draw to |
| a | (number, number) | Tuple (x, y) for point a |
| b | (number, number) | Tuple (x, y) for point b |
| count | int | Number of ticks on the line, 1, 2 or 3. |
| length | number | length of the tick in user units. |
| gap | number | Gap between ticks in user units. |
Draws an tick across the line ab. The tick is half way between points a and b, and points towards b.
Example
See the example in the angle_marker article.
See also
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