ClassTicks

1. summary Superclass for everything that draws tickmarks
2. labels Reference,Version1

_(This page applies only to the 1.x branch of SVGFig.)_

class Ticks

Ticks is the superclass for everything that draws tickmarks. By itself, it can draw ticks along a curve which isn't itself drawn. Maybe you'll find that useful.

Arguments

• Ticks(f, low, high, ticks, miniticks, labels, logbase, arrow_start, arrow_end, text_attr, attribute=value)*

	f		_*required*_		parametric function along which ticks will be drawn; has the same format as the function used in [ClassCurve Curve]
	low, high		_*required*_		range of the independent variable
	ticks		_default_=-10		request ticks according to the [TickSpecification standard tick specification]
	miniticks		_default_=True		request miniticks according to the [TickSpecification standard minitick specification]
	labels		True		request tick labels according to the [TickSpecification standard tick label specification]
	logbase		_default_=None		if a number, the axis is logarithmic with ticks at the given base (10 being the most common)
	arrow_start		_default_=None		if a new string identifier, draw an arrow at the low-end of the axis, referenced by that identifier; if an SVG marker object, use that marker
	arrow_end		_default_=None		if a new string identifier, draw an arrow at the high-end of the axis, referenced by that identifier; if an SVG marker object, use that marker
	text_attr		_default_={}		SVG attributes for the text labels
	attribute=value pairs		_keyword list_		SVG attributes for the tick marks

Defaults

Ticks has the following defaults, as described in [GeneralPrimitive General features for all primitives].

	text_defaults		{"stroke":"none", "fill":"black", "font-size":5}		default SVG attributes for text labels
	tick_start		-1.5		position relative to the axis (in SVG units) to start the ticks
	tick_end		1.5		position relative to the axis (in SVG units) to end the ticks
	minitick_start		-1.5		position relative to the axis (in SVG units) to start the miniticks
	minitick_end		1.5		position relative to the axis (in SVG units) to end the miniticks
	text_start		2.5		position relative to the axis (in SVG units) to set text
	text_angle		0		angle (in degrees) to rotate text

Special data members

When a Ticks is evaluated with *SVG*, it will gain two members.

• *last_ticks*: explicit dict of value, label pairs for major ticks
• *last_miniticks*: explicit list of values for miniticks

SVG method

Ticks has an *SVG* method, as described in [GeneralPrimitive General features for all primitives].

Other methods

Ticks has a number of other methods which are usually only used internally.

• *interpret()*: evaluate and return optimal ticks and miniticks according to the [TickSpecification standard minitick specification]
• *orient_tickmark(t, trans=None)*: return the position, normalized local x vector, normalized local y vector, and angle of a tick at position t
• *compute_ticks(N, format)*: return less than -N or exactly N optimal linear ticks
• *regular_miniticks(N)*: return exactly N linear ticks
• *compute_miniticks(original_ticks)*: return optimal linear miniticks, given a set of ticks
• *compute_logticks(base, N, format)*: return less than -N or exactly N optimal logarithmic ticks
• *compute_logminiticks(base)*: return optimal logarithmic miniticks, given a set of ticks