Difference between revisions of "Manual/Plugins/Scripting/0.9.5"

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The details of the language are specified in the [http://qt-project.org/doc/qt-5.0/qtscript/ecmascript.html Qt ECMAScript reference]. This page focuses on functions and objects specific to Knotter.
 
The details of the language are specified in the [http://qt-project.org/doc/qt-5.0/qtscript/ecmascript.html Qt ECMAScript reference]. This page focuses on functions and objects specific to Knotter.
 +
  
 
==Geometry==
 
==Geometry==
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{{object list item|contains(x,y)|Boolean|{{js|contains(new Point(x,y))}}.}}
 
{{object list item|contains(x,y)|Boolean|{{js|contains(new Point(x,y))}}.}}
 
{{object list item|add_vertex(point)|void|Appends a vertex to {{js|vertices}}.}}
 
{{object list item|add_vertex(point)|void|Appends a vertex to {{js|vertices}}.}}
 +
{{object list end}}
 +
 +
 +
==Color==
 +
{{object list begin}}
 +
{{object list section|Constructors}}
 +
{{object list header}}
 +
{{object list item|new Color()|Color|Creates a transparent black color}}
 +
{{object list item|new Color(string)|Color|Create a color from a color name eg: '''#ff00ff''', '''red'''}}
 +
{{object list item|new Color(r,g,b,a{{=}}255)|Color|Create a color from rgb components [0-255]}}
 +
{{object list item|new Color(color)|Color|Copy color}}
 +
{{object list section|Properties}}
 +
{{object list header}}
 +
{{object list item|alpha|Number|Transparency [0-255]}}
 +
{{object list item|red|Number|RGB red channel [0-255]}}
 +
{{object list item|green|Number|RGB green channel [0-255]}}
 +
{{object list item|blue|Number|RGB blue channel [0-255]}}
 +
{{object list item|hue|Number|HSV hue channel [0-360]}}
 +
{{object list item|saturation|Number|HSV saturation channel [0-255]}}
 +
{{object list item|value|Number|HSV value channel [0-255]}}
 +
{{object list item|cyan|Number|CMYK cyan channel [0-255]}}
 +
{{object list item|magenta|Number|CMYK magenta channel [0-255]}}
 +
{{object list item|yellow|Number|CMYK yellow channel [0-255]}}
 +
{{object list item|black|Number|CMYK black channel [0-255]}}
 +
{{object list section|Number|External functions}}
 +
{{object list header}}
 +
{{object list item|rgb(r,g,b,a{{=}}255)|Color|Same as {{js|new Color(r,g,b,a)}}}}
 +
{{object list item|hsv(h,s,v,a{{=}}255)|Color|Creates a color from its HSV components}}
 +
{{object list item|hsl(h,s,l,a{{=}}255)|Color|Creates a color from its HSL components}}
 +
{{object list item|cmyk(c,m,y,k,a{{=}}255)|Color|Creates a color from its CMYK components}}
 
{{object list end}}
 
{{object list end}}
  
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{{object list item|nodes|Array[Node]|Nodes in the graph}}
 
{{object list item|nodes|Array[Node]|Nodes in the graph}}
 
{{object list item|edges|Array[Edge]|Edges in the graph}}
 
{{object list item|edges|Array[Edge]|Edges in the graph}}
 +
{{object list item|style|Graph.Style|Graph Style}}
 
{{object list item|selected_nodes|Array[node]|List of the selected nodes}}
 
{{object list item|selected_nodes|Array[node]|List of the selected nodes}}
 
{{object list item|add_node(point)|Node|Creates a new node}}
 
{{object list item|add_node(point)|Node|Creates a new node}}
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{{object list item|clear()|void|Remove all edges and nodes}}
 
{{object list item|clear()|void|Remove all edges and nodes}}
 
{{object list end}}
 
{{object list end}}
 +
  
 
===Node===
 
===Node===
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{{object list item|selected|Boolean|Whether the node is selected.}}
 
{{object list item|selected|Boolean|Whether the node is selected.}}
 
{{object list item|edges|Array[Edge]|(Read-Only) Edges with this node as vertex.}}
 
{{object list item|edges|Array[Edge]|(Read-Only) Edges with this node as vertex.}}
−
{{object list item|style|Node_Style|Contains the style features that this node overrides from the graph}}
+
{{object list item|style|Node.Style|Contains the style features that this node overrides from the graph}}
 
{{object list item|has_edge_too(Node other)|Boolean|Whether there is an edge from {{js|this}} to {{js|other}}.}}
 
{{object list item|has_edge_too(Node other)|Boolean|Whether there is an edge from {{js|this}} to {{js|other}}.}}
 
{{object list item|edge_to(Node other)|Edge|Edge connecting {{js|this}} and {{js|other}}.}}
 
{{object list item|edge_to(Node other)|Edge|Edge connecting {{js|this}} and {{js|other}}.}}
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{{object list item|line|Line|Line from {{js|vertex1.pos}} to {{js|vertex2.pos}}}}
 
{{object list item|line|Line|Line from {{js|vertex1.pos}} to {{js|vertex2.pos}}}}
 
{{object list item|midpoint|Point|Point at the middle of the edge}}
 
{{object list item|midpoint|Point|Point at the middle of the edge}}
 +
{{object list item|style|Edge.Style|Contains the style features that this edge overrides from the graph}}
 
{{object list item|is_vertex(node)|Boolean|Whether the node is a vertex of the edge}}
 
{{object list item|is_vertex(node)|Boolean|Whether the node is a vertex of the edge}}
 
{{object list item|other(node)|Node|If the given node is one of its vertices, return the other vertex}}
 
{{object list item|other(node)|Node|If the given node is one of its vertices, return the other vertex}}
−
{{object list item|type|String|The name of the edge type. Possible values are the elements of {{js|knotter.edge_types}} }}
 
 
{{object list end}}
 
{{object list end}}
  
  
−
===Node_Style===
+
===Graph.Style===
 +
Default style for nodes and edges and graph appearance
 +
{{object list begin}}
 +
{{object list header}}
 +
{{object list item|crossing|Edge.Style|Default edge style}}
 +
{{object list item|cusp|Node.Style|Default node style}}
 +
{{object list item|colors|Array[Color]|(Read-Only) Colors}}
 +
{{object list end}}
 +
 
 +
===Node.Style===
 +
For nodes, a single style feature can be removed by setting it to {{js|undefined}}
 +
{{object list begin}}
 +
{{object list header}}
 +
{{object list item|angle|Number|Minimum angle required to trigger a cusp}}
 +
{{object list item|curve|Number|Size of the curve control handles}}
 +
{{object list item|distance|Number|Distance of the tip of the cusp from the node}}
 +
{{object list item|shape|String|Name of the cusp shape. Possible values are the elements of {{js|knotter.cusp_shapes}}}}
 +
{{object list item|clear()|void|Reset all features}}
 +
{{object list end}}
 +
 
 +
===Edge.Style===
 
For nodes, a single style feature can be removed by setting it to {{js|undefined}}
 
For nodes, a single style feature can be removed by setting it to {{js|undefined}}
 
{{object list begin}}
 
{{object list begin}}
 
{{object list header}}
 
{{object list header}}
−
{{object list item|cusp_angle|Number|Minimum angle required to trigger a cusp}}
+
{{object list item|curve|Number|Size of the curve control handles}}
−
{{object list item|handle_length|Number|Size of the curve control handles}}
+
{{object list item|gap|Number|Size of the gap for a rope passing under a crossing}}
−
{{object list item|crossing_distance|Number|Size of the gap for a rope passing under a crossing}}
+
{{object list item|slide|Number|Slide the crossing position [0-1]}}
−
{{object list item|cusp_distance|Number|Distance of the tip of the cusp from the node}}
+
{{object list item|type|String|The name of the edge type. Possible values are the elements of {{js|knotter.edge_types}} }}
−
{{object list item|cusp_shape|String|Name of the cusp shape. Possible values are the elements of {{js|knotter.cusp_shapes}}}}
 
 
{{object list item|clear()|void|Reset all features}}
 
{{object list item|clear()|void|Reset all features}}
 
{{object list end}}
 
{{object list end}}
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==Interaction with Knotter==
 
==Interaction with Knotter==
  
 +
===system===
 +
Object that allows interactions with the system.
 +
{{object list begin}}
 +
{{object list header}}
 +
{{object list item|read_file(file_name)|ByteArray|Read file contents}}
 +
{{object list item|write_file(file_name,data)|Boolean|Write data to file.{{js|data}} can be either a string or a ByteArray. Returns true if the output was successful.}}
 +
{{object list item|temp_path()|String|Returns the system temporary directory path.}}
 +
{{object list end}}
  
 
===knotter===
 
===knotter===
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{{object list item|version|String|Knotter version}}
 
{{object list item|version|String|Knotter version}}
 
{{object list item|has_version(Number major,Number minor)|Boolean|Whether the current version is greater than major.minor.0}}
 
{{object list item|has_version(Number major,Number minor)|Boolean|Whether the current version is greater than major.minor.0}}
 +
{{object list item|cusp_shapes|Array[String]|Array of names of the available cusp shapes}}
 +
{{object list item|edge_types|Array[String]|Array of names of the available edge types}}
 
{{object list end}}
 
{{object list end}}
  
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{{object list item|grid|Grid|The grid used by the document.}}
 
{{object list item|grid|Grid|The grid used by the document.}}
 
{{object list item|insert(graph,message{{=}}"ScriptInsert")|Boolean|Insert graph in the document. The inserted graph will have to be placed by the user in the desired location. Returns whether insertion has been successful.}}
 
{{object list item|insert(graph,message{{=}}"ScriptInsert")|Boolean|Insert graph in the document. The inserted graph will have to be placed by the user in the desired location. Returns whether insertion has been successful.}}
 +
{{object list item|render|Document.Render|Document renderer}}
 
{{object list item|begin_macro(message)|void|Wrap following edits to the document in a macro, the message will be the text displayed in the action history. Macros can be nested.}}
 
{{object list item|begin_macro(message)|void|Wrap following edits to the document in a macro, the message will be the text displayed in the action history. Macros can be nested.}}
 
{{object list item|end_macro()|void|End current macro. For each call to {{js|begin_macro}} there should be a call to {{js|end_macro}}.}}
 
{{object list item|end_macro()|void|End current macro. For each call to {{js|begin_macro}} there should be a call to {{js|end_macro}}.}}
 
{{object list end}}
 
{{object list end}}
 +
  
 
===Grid===
 
===Grid===

Latest revision as of 16:28, 21 October 2013

This page is updated to Knotter version 0.9.5

Scripts are in QtScript aka ECMAScript aka JavaScript.

The details of the language are specified in the Qt ECMAScript reference. This page focuses on functions and objects specific to Knotter.


Geometry

Point

A wrapper to QPointF.

Constructors
Name Type Description
new Point() Point new Point(0,0)
new Point( Point other ) Point Copy point other
new Point( Number x, Number y ) Point Create point with given coordinates
External functions
Name Type Description
opposite( Point p ) Point new Point(-p.x,-p.y)
distance(Point a, Point b) Number Distance from a and b

Line

A wrapper to QLineF most of the functionality of QLineF is also present in line.

Constructors
Name Type Description
new Line() Line Empty line
new Line( Line other ) Line Copy line other_line
new Line( point1, point2 ) Line Line from point point1 to point2
Properties
Name Type Description
p1 Point Starting point of the line
p2 Point End point of the line
x1 Number p1.x
x2 Number p2.x
y1 Number p1.y
y2 Number p2.y
angle Number Angle of the line in degrees. An angle of 0° is a horizontal line pointing to the right.
length Number Length of the line (distance between p1 and p2
dx Number p1.x-p2.x
dy Number p1.y-p2.y
Methods
Name Type Description
intersect ( Line other ) Point Return the intersection point between the current line and other
normalVector() Line Returns a line that is perpendicular to this line with the same starting point and length.
unitVector() Line Returns the unit vector for this line, i.e a line starting at the same point as this line with a length of 1.0.
pointAt(Number t) Point Returns the point at the parameterized position specified by t. The function returns the line's start point if t = 0, and its end point if t = 1.
translate(Point offset) void Translate the line by offset
translate(Number x,Number y) void translate(point(x,y))

Polygon

Name Type Description
new Polygon() Polygon Create an empty polygon.
new Polygon(vertices) Polygon Create a polygon with given vertices.
vertices Array[Point] Vertices of the polygon.
contains(point) Boolean Whether the point is inside the polygon.
contains(x,y) Boolean contains(new Point(x,y)).
add_vertex(point) void Appends a vertex to vertices.


Color

Constructors
Name Type Description
new Color() Color Creates a transparent black color
new Color(string) Color Create a color from a color name eg: #ff00ff, red
new Color(r,g,b,a=255) Color Create a color from rgb components [0-255]
new Color(color) Color Copy color
Properties
Name Type Description
alpha Number Transparency [0-255]
red Number RGB red channel [0-255]
green Number RGB green channel [0-255]
blue Number RGB blue channel [0-255]
hue Number HSV hue channel [0-360]
saturation Number HSV saturation channel [0-255]
value Number HSV value channel [0-255]
cyan Number CMYK cyan channel [0-255]
magenta Number CMYK magenta channel [0-255]
yellow Number CMYK yellow channel [0-255]
black Number CMYK black channel [0-255]
Number
Name Type Description
rgb(r,g,b,a=255) Color Same as new Color(r,g,b,a)
hsv(h,s,v,a=255) Color Creates a color from its HSV components
hsl(h,s,l,a=255) Color Creates a color from its HSL components
cmyk(c,m,y,k,a=255) Color Creates a color from its CMYK components

Graph

Graph

The graph for a given knot.

Name Type Description
new graph() Graph Creates an empty graph
nodes Array[Node] Nodes in the graph
edges Array[Edge] Edges in the graph
style Graph.Style Graph Style
selected_nodes Array[node] List of the selected nodes
add_node(point) Node Creates a new node
add_node(x,y) Node Creates a new node
remove_node(node) void Remove node from the graph
remove_edge(edge) void Remove edge from the graph
connect(node1,node2) Edge Creates a new edge
node_at(point) Node Get the node at the given location
node_at(x,y) Node Get the node at the given location
node_at(point,radius) Array[Node] Get the nodes within given distance from location
node_at(x,y,radius) Array[Node] Get the nodes within given distance from location
append( file_name, keep_style=false, offset=Point() ) Boolean Add nodes and edges from a file. keep_style controls whether the nodes should have their custom style set to override the graph style in order to follow the style from the file.
append(Graph other) void The contents of the other graph are copied to this graph.
clear() void Remove all edges and nodes


Node

Name Type Description
pos Point Position of the node.
x Number pos.x.
y Number pos.y.
selected Boolean Whether the node is selected.
edges Array[Edge] (Read-Only) Edges with this node as vertex.
style Node.Style Contains the style features that this node overrides from the graph
has_edge_too(Node other) Boolean Whether there is an edge from this to other.
edge_to(Node other) Edge Edge connecting this and other.

Edge

Name Type Description
vertex1 Node One of the vertices of the edge
vertex2 Node One of the vertices of the edge
line Line Line from vertex1.pos to vertex2.pos
midpoint Point Point at the middle of the edge
style Edge.Style Contains the style features that this edge overrides from the graph
is_vertex(node) Boolean Whether the node is a vertex of the edge
other(node) Node If the given node is one of its vertices, return the other vertex


Graph.Style

Default style for nodes and edges and graph appearance

Name Type Description
crossing Edge.Style Default edge style
cusp Node.Style Default node style
colors Array[Color] (Read-Only) Colors

Node.Style

For nodes, a single style feature can be removed by setting it to undefined

Name Type Description
angle Number Minimum angle required to trigger a cusp
curve Number Size of the curve control handles
distance Number Distance of the tip of the cusp from the node
shape String Name of the cusp shape. Possible values are the elements of knotter.cusp_shapes
clear() void Reset all features

Edge.Style

For nodes, a single style feature can be removed by setting it to undefined

Name Type Description
curve Number Size of the curve control handles
gap Number Size of the gap for a rope passing under a crossing
slide Number Slide the crossing position [0-1]
type String The name of the edge type. Possible values are the elements of knotter.edge_types
clear() void Reset all features

Interaction with Knotter

system

Object that allows interactions with the system.

Name Type Description
read_file(file_name) ByteArray Read file contents
write_file(file_name,data) Boolean Write data to file.data can be either a string or a ByteArray. Returns true if the output was successful.
temp_path() String Returns the system temporary directory path.

knotter

Object with information on Knotter.

Name Type Description
version String Knotter version
has_version(Number major,Number minor) Boolean Whether the current version is greater than major.minor.0
cusp_shapes Array[String] Array of names of the available cusp shapes
edge_types Array[String] Array of names of the available edge types

window

Perform some basic operations to Knotter main window.

Name Type Description
current_file String (Read only) File name of the knot in the active tab
current_tab Number Index of the active tab
open_tabs Number Number of open tabs
document Document Document corresponding to the current tab.
open( String file ) Boolean Open file, returns true if successful
open() Boolean Create an new tab
screenshot(String file, String widget_name="") void Take a screenshot of the given widget (or the main window if widget_name is empty).

window.dialog

An object that contains several functions to display simple dialogs to the user

Name Type Description
information(message,title="") void Display an information dialog
warning(message,title="") void Display a warning dialog
critical(message,title="") void Display an error dialog
question(message, title="", button_0="OK", button_1="", button_2="") Number Display a dialog asking a question. For every non-empty button text a button is shown. Returns the index of the button that the user pressed.
get_open_file(title="",filters="") String Show a dialog to open a file. Filters is in the form "Text (.txt);;Image (.svg .png)", Returns the selected file name or an empty string if the user canceled the dialog.
get_number(message, title="", default_value=0, min=MIN, max=MAX) Number Asks a dialog for a number. Returns NaN if the user canceled.
get_integer(message, title="", default_value=0, min=MIN, max=MAX) Number Just like get_number but only integers values are allowed
get_text(message,title="",default_value=) String Ask the user for a line of text.
information(get_item,title="",items=[]) String Ask the user to select an item from the list. Returns the string representing the value or an empty string if the user canceled the dialog.
load_widget(file_name) QWidget Load a widget from a Ui file
progress_dialog(message, maximum=0, cancel_button="Cancel" ) QProgressDialog Creates a progress dialog.


Document

(Global object) The document from which the script was called. While window.document may change, the global document object will be the same during the entire script.

Name Type Description
filename String The name of the file for this document.
graph Graph The graph contained by the document.
grid Grid The grid used by the document.
insert(graph,message="ScriptInsert") Boolean Insert graph in the document. The inserted graph will have to be placed by the user in the desired location. Returns whether insertion has been successful.
render Document.Render Document renderer
begin_macro(message) void Wrap following edits to the document in a macro, the message will be the text displayed in the action history. Macros can be nested.
end_macro() void End current macro. For each call to begin_macro there should be a call to end_macro.


Grid

The grid displayed by a document object.

Name Type Description
size Number Size of a grid cell.
origin Point Position of the grid origin
enabled Boolean Whether the grid is displayed or not.
shape String One of SQUARE, TRIANGLE1 or TRIANGLE2.
enable() void Shorthand for grid.enabled = true;.
disable() void Shorthand for grid.enabled = false;.

Path

Object used in cusp plugins to draw the knot line, wrapper to the Knotter internal Path_Builder class. Cannot be constructed by the user.

Methods
Name Type Description
add_line( Point p1, Point p2 ) void Draw a straight line from p1 to p2
add_quad( Point p1, Point control, Point p2 void Draw a quadratic curve from p1 to p2 with control point control
add_cubic( Point p1, Point control1, Point control2, Point p2 ) void Draw a cubic curve from p1 to p2 with control points control1 and control2

Plugin-specific objects

All Plugins

All plugins can access the object plugin that contains the information from the plugin data.

Cusp Plugins

Name Type Description
angle Number The angle between input and output edge
cusp_angle Number Style setting, if angle > cusp_angle , draw a cusp
handle_length Number Style setting, "curve" style parameter in the UI
start_handle Line Starting point for lines, start_handle.p1 will be connected to the path forming the crossing
finish_handle Line Ending point for lines, finish_handle.p1 will be connected to the path forming the crossing
cusp_point Point Pre-computed cusp point location
node_point Point Position of the node between the two edges
input_edge Line Line corresponding to the input edge
output_edge Line Line corresponding to the output edge
path Path Object used to build the path
direction Number -1 or +1 depending on the direction of the angle (clockwise or counter)

Guidelines

A cusp is expected to render a path from start_handle.p1 to finish_handle.p1.

start_handle.p2 and finish_handle.p2 may be used as control points.

If angle > cusp_angle the line should pass through cusp_point

Example

Follows the code to replicate the built-in rounded cusp. 

// When angle is large enough, draw the cusp
if ( angle > cusp_angle ) 
{
    // Create a "handle" that on cusp_point with size handle_length to determine the control points
    var handle = new Line(start_handle.p1,finish_handle.p1);
    handle.translate(cusp_point);
    handle.translate(opposite(start_handle.p1));
    handle.length = handle_length;
    var h2 = handle.p2;
    handle.length = -handle_length;
    var h1 = handle.p2;
    // Use the control points to render the cusp
    path.add_cubic ( start_handle.p1, start_handle.p2, h1, cusp_point );
    path.add_cubic ( finish_handle.p1, finish_handle.p2, h2, cusp_point );
}
else
{
    // Don't draw a cusp, just a curve from start_handle to finish_handle
    
    if ( distance(start_handle.p1,finish_handle.p1) < start_handle.length + finish_handle.length )
    {
        // The two edges are very close together, avoid artifacts with a simpler curve
        var midpoint = Point( (start_handle.p2.x+finish_handle.p2.x)/2,
                              (start_handle.p2.y+finish_handle.p2.y)/2 );
        path.add_quad(start_handle.p1,midpoint,finish_handle.p1);
    }
    else
    {
        // There's enough room to draw a cubic curve
        path.add_cubic(start_handle.p1,start_handle.p2,finish_handle.p2,finish_handle.p1);
    }
}
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