Interface CPY_Step

Copy Step options object

A copy step defines how to copy existing points.

An array of copy steps will cumulatively copy points from an original set of points.

So, if there are two copy steps then:

the first step will copy the original points
the second step will copy the original points and the first copy of the points

For example, a grid of a shape can be made with two copy steps. The first replicates the shape along the x axis, creating a line of shapes. The second copy step then replicates the line of shapes in the y axis, creating a grid of shapes.

Each copy step appends its copied points onto an array of points that started with the original points. By default, copy steps operate on all points created in previous steps. However, the properties start and end can be used to make the current step only operate on a subset of the points.

start and end refer to the indexes of the copy steps where the original points is at index 0, and the first copy step is at index 1. Copy step arrays can also include marker strings which make defining start and end more convient (see the third example below). These marker strings can be used as start and end values. Marker strings are included in the copy step indexing.

There are two main ways to make a copy, either copy the points to a location, or copy the points along a path.

When using the to property, if a Point is defined then the points will be copied to that point. If a Transform is defined, then a copy of the points will be transformed by that transform. An array of points and transforms can be defined to make multiple copies of the points.

When using the along property, the points are copied a number (num) of times along a path with some step. The paths can be horiztonal ('x'), vertical ('y'), along the z axis ('z'), at an angle in the xy plane, (number), along a direction vector (TypeParsablePoint) or through a 'rotation' around a center point and axis.

When copying along a line (along is 'x', y', 'z', TypeParsablePoint or a number), then step will be the distance offset along the line.

When copying along a rotation (along is 'rotation'), then step will be the angular step in radians.

Any step can use the original property - but it will only operate on the last step that uses it. When original is false, then all points before that copy step will not be included in the returned Point array.

Example

// Grid copy
figure.add({
  name: 'triGrid',
  make: 'polygon',
  radius: 0.1,
  sides: 3,
  rotation: -Math.PI / 6,
  fill: 'tris',
  copy: [
    {
      along: 'x',
      num: 4,
      step: 0.3,
    },
    {
      along: 'y',
      num: 4,
      step: 0.3,
    },
  ],
});

Example

// Radial lines copy
figure.add({
  name: 'radialLines',
  make: 'generic',
  points: [
    [-0.2, -0.1], [-0.2, 0.1], [0.2, 0.1],
    [-0.2, -0.1], [0.2, 0.1], [0.2, -0.1],
  ],
  copy: [
    {
      to: [[0.6, 0], [1.05, 0], [1.5, 0], [2.2, 0]],
    },
    {
      along: 'rotation',
      num: 5,
      step: Math.PI / 5,
      start: 1,              // only copy last step, not original points
    },
  ],
});

Example

// Ring copy (without original shape)
figure.add({
  name: 'halfRings',
  make: 'polygon',
  radius: 0.1,
  sides: 20,
  fill: 'tris',
  copy: [
    'ring1',               // marker 1
    {
      to: [0.5, 0],
      original: false,     // don't include the original shape
    },
    {
      along: 'rotation',
      num: 7,
      step: Math.PI / 7,
      start: 'ring1',      // copy only from marker 1
    },
    'ring2',               // marker 2
    {
      to: [1, 0],
      start: 0,            // make a copy of the original shape only
      end: 1,
    },
    {
      along: 'rotation',
      num: 15,
      step: Math.PI / 15,
      start: 'ring2',      // copy points from Marker 2 only
    },
  ],
});
@interface

Interface CPY_Step

Example

Example

Example

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