# Tick

Categories: generativepy generative art

The `TickMarker`

class is a special Shape that adds a small cross line marker to a line, of the type often used in geometric diagrams to show that two lines are the same length. They look like this:

You can add 1, 2 or 3 ticks.

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.

## TickMarker class

`TickMarker`

is derived from the `Shape`

class. It adds several methods:

`of_start_end`

`with_length`

`with_count`

`with_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 tick will be halfway between points `a`

and `b`

.

### with_length

Sets the length of the tick.

with_length(length)

Parameter | Type | Description |
---|---|---|

length | number | Length of tick in user units. |

The default is 4.

### with_count

Sets the number of ticks in the marker.

with_count(count)

Parameter | Type | Description |
---|---|---|

count | int | Number of ticks |

This can be used to draw a single, double, or triple tick. Permitted values are 1, 2, or 3. Default is 1.

### with_gap

Sets the gap between the ticks if `count > 1`

.

with_gap(gap)

Parameter | Type | Description |
---|---|---|

gap | number | Gap between ticks in user units. |

Sets the spacing of the ticks. This is only relevant if there is more than one tick (ie if `count > 1`

), otherwise it is ignored. The default is 1.

## tick function

This older `tick`

function is deprecated as of GenerativePy 3.1.

tick(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`

.

## Example

See the example in the angle_marker article.

## See also

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