Constructor
new Arc(pc, r, startAngle, endAngle, counterClockwise)
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Parameters:
Name | Type | Description |
---|---|---|
pc |
Point
|
arc center |
r |
number
|
arc radius |
startAngle |
number
|
start angle in radians from 0 to 2*PI |
endAngle |
number
|
end angle in radians from 0 to 2*PI |
counterClockwise |
boolean
|
arc direction, true - clockwise, false - counter clockwise |
Classes
Members
sweep
Get sweep angle in radians. Sweep angle is non-negative number from 0 to 2*PI
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Methods
breakToFunctional() → {Array.<Arcs>}
Breaks arc in extreme point 0, pi/2, pi, 3*pi/2 and returns array of sub-arcs
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Returns:
- Type:
-
Array.<Arcs>
chordHeight() → {number}
Returns chord height ("sagitta") of the arc
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Returns:
- Type:
-
number
contains(pt) → {boolean}
Returns true if arc contains point, false otherwise
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Parameters:
Name | Type | Description |
---|---|---|
pt |
Point
|
point to test |
Returns:
- Type:
-
boolean
distanceTo(shape) → {number|Segment}
Calculate distance and shortest segment from arc to shape and return array [distance, shortest segment]
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Parameters:
Name | Type | Description |
---|---|---|
shape |
Shape
|
Shape of the one of supported types Point, Line, Circle, Segment, Arc, Polygon or Planar Set |
Returns:
-
- Type:
-
number
distance from arc to shape -
- Type:
-
Segment
shortest segment between arc and shape (started at arc, ended at shape)
intersect(shape) → {Array.<Points>}
Returns array of intersection points between arc and other shape
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Parameters:
Name | Type | Description |
---|---|---|
shape |
Shape
|
Shape of the one of supported types |
Returns:
- Type:
-
Array.<Points>
pointAtLength(length) → {Point}
Get point at given length
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Parameters:
Name | Type | Description |
---|---|---|
length |
number
|
The length along the arc |
Returns:
- Type:
-
Point
reverse() → {Arc}
Returns new arc with swapped start and end angles and reversed direction
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Returns:
- Type:
-
Arc
rotate(angle, center) → {Arc}
Return new segment rotated by given angle around given point
If point omitted, rotate around origin (0,0)
Positive value of angle defines rotation counter clockwise, negative - clockwise
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Parameters:
Name | Type | Default | Description |
---|---|---|---|
angle |
number
|
0 | rotation angle in radians |
center |
Point
|
center point, default is (0,0) |
Returns:
- Type:
-
Arc
scale(scaleX, scaleY) → {Arc}
Return new arc scaled by scaleX, scaleY.
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Parameters:
Name | Type | Default | Description |
---|---|---|---|
scaleX |
number
|
1 | scale value by X |
scaleY |
number
|
1 | scale value by Y |
Returns:
- Type:
-
Arc
sortPoints(array) → {Array.<Point>}
Sort given array of points from arc start to end, assuming all points lay on the arc
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Parameters:
Name | Type | Description |
---|---|---|
array |
Array.<Point>
|
of points |
split(pt) → {Array.<Arc>}
When given point belongs to arc, return array of two arcs split by this point. If points is incident
to start or end point of the arc, return clone of the arc. If point does not belong to the arcs, return
empty array.
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Parameters:
Name | Type | Description |
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pt |
Point
|
Query point |
Returns:
- Type:
-
Array.<Arc>
svg(attrs) → {string}
Return string to draw arc in svg
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Parameters:
Name | Type | Description |
---|---|---|
attrs |
Object
|
an object with attributes of svg path element |
Returns:
- Type:
-
string
tangentInEnd() → {Vector}
Return tangent unit vector in the end point in the direction from end to start
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Returns:
- Type:
-
Vector
tangentInStart() → {Vector}
Return tangent unit vector in the start point in the direction from start to end
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Returns:
- Type:
-
Vector
toJSON() → {Object}
This method returns an object that defines how data will be
serialized when called JSON.stringify() method
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Returns:
- Type:
-
Object
transform(matrix) → {Arc}
Return new arc transformed using affine transformation matrix
Note 1. Non-equal scaling by x and y (abs(matrix[0]) != abs(matrix[3])) produce illegal result because it should create elliptic arc but this package does not support ellipses Note 2. Mirror transformation (matrix[0] * matrix[3] < 0) change direction of the arc to the opposite TODO: support non-equal scaling arc to ellipse or throw exception ?
Note 1. Non-equal scaling by x and y (abs(matrix[0]) != abs(matrix[3])) produce illegal result because it should create elliptic arc but this package does not support ellipses Note 2. Mirror transformation (matrix[0] * matrix[3] < 0) change direction of the arc to the opposite TODO: support non-equal scaling arc to ellipse or throw exception ?
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Parameters:
Name | Type | Description |
---|---|---|
matrix |
Matrix
|
affine transformation matrix |
Returns:
- Type:
-
Arc