ALKMaps.Handler.Path

Handler to draw a path on the map. Path is displayed on mouse down, moves on mouse move, and is finished on mouse up.

Inherits from

ALKMaps.Handler.Point

Summary

ALKMaps.Handler.Path	Handler to draw a path on the map.
Properties
line	{ALKMaps.Feature.Vector}
maxVertices	{Number} The maximum number of vertices which can be drawn by this handler.
doubleTouchTolerance	{Number} Maximum number of pixels between two touches for the gesture to be considered a “finalize feature” action.
freehand	{Boolean} In freehand mode, the handler starts the path on mouse down, adds a point for every mouse move, and finishes the path on mouse up.
freehandToggle	{String} If set, freehandToggle is checked on mouse events and will set the freehand mode to the opposite of this.freehand.
timerId	{Integer} The timer used to test the double touch.
redoStack	{Array} Stack containing points removed with undo.
Constructor
ALKMaps.Handler.Path	Create a new path hander
Functions
createFeature	Add temporary geometries
destroyFeature	Destroy temporary geometries
destroyPersistedFeature	Destroy the persisted feature.
removePoint	Destroy the temporary point.
addPoint	Add point to geometry.
insertXY	Insert a point in the current sketch given x & y coordinates.
insertDeltaXY	Insert a point given offsets from the previously inserted point.
insertDirectionLength	Insert a point in the current sketch given a direction and a length.
insertDeflectionLength	Insert a point in the current sketch given a deflection and a length.
getCurrentPointIndex	{Number} The index of the most recently drawn point.
undo	Remove the most recently added point in the sketch geometry.
redo	Reinsert the most recently removed point resulting from an undo call.
freehandMode	Determine whether to behave in freehand mode or not.
modifyFeature	Modify the existing geometry given the new point
drawFeature	Render geometries on the temporary layer.
getSketch	Return the sketch feature.
getGeometry	Return the sketch geometry.
touchstart	handle touchstart.
down	Handle mousedown and touchstart.
move	Handle mousemove and touchmove.
up	Handle mouseup and touchend.
finishGeometry	Finish the geometry and send it back to the control.
dblclick	Handle double-clicks.

Properties

line

{ALKMaps.Feature.Vector}

maxVertices

{Number} The maximum number of vertices which can be drawn by this handler. When the number of vertices reaches maxVertices, the geometry is automatically finalized. Default is null.

doubleTouchTolerance

{Number} Maximum number of pixels between two touches for the gesture to be considered a “finalize feature” action. Default is 20.

freehand

{Boolean} In freehand mode, the handler starts the path on mouse down, adds a point for every mouse move, and finishes the path on mouse up. Outside of freehand mode, a point is added to the path on every mouse click and double-click finishes the path.

freehandToggle

{String} If set, freehandToggle is checked on mouse events and will set the freehand mode to the opposite of this.freehand. To disallow toggling between freehand and non-freehand mode, set freehandToggle to null. Acceptable toggle values are ‘shiftKey’, ‘ctrlKey’, and ‘altKey’.

timerId

{Integer} The timer used to test the double touch.

redoStack

{Array} Stack containing points removed with undo.

Constructor

ALKMaps.Handler.Path

Create a new path hander

Parameters

control	{ALKMaps.Control} The control that owns this handler
callbacks	{Object} An object with a properties whose values are functions. Various callbacks described below.
options	{Object} An optional object with properties to be set on the handler

Named callbacks

create	Called when a sketch is first created. Callback called with the creation point geometry and sketch feature.
modify	Called with each move of a vertex with the vertex (point) geometry and the sketch feature.
point	Called as each point is added. Receives the new point geometry.
done	Called when the point drawing is finished. The callback will receive a single argument, the linestring geometry.
cancel	Called when the handler is deactivated while drawing. The cancel callback will receive a geometry.

Functions

createFeature

createFeature: function( pixel )

Add temporary geometries

Parameters

pixel

{ALKMaps.Pixel} The initial pixel location for the new feature.

destroyFeature

destroyFeature: function( force )

Destroy temporary geometries

Parameters

force

{Boolean} Destroy even if persist is true.

destroyPersistedFeature

destroyPersistedFeature: function()

Destroy the persisted feature.

removePoint

removePoint: function()

Destroy the temporary point.

addPoint

addPoint: function( pixel )

Add point to geometry. Send the point index to override the behavior of LinearRing that disregards adding duplicate points.

Parameters

pixel

{ALKMaps.Pixel} The pixel location for the new point.

insertXY

insertXY: function( x,
y )

Insert a point in the current sketch given x & y coordinates. The new point is inserted immediately before the most recently drawn point.

Parameters

x	{Number} The x-coordinate of the point.
y	{Number} The y-coordinate of the point.

insertDeltaXY

insertDeltaXY: function( dx,
dy )

Insert a point given offsets from the previously inserted point.

Parameters

dx	{Number} The x-coordinate offset of the point.
dy	{Number} The y-coordinate offset of the point.

insertDirectionLength

insertDirectionLength: function( direction,
length )

Insert a point in the current sketch given a direction and a length.

Parameters

direction	{Number} Degrees clockwise from the positive x-axis.
length	{Number} Distance from the previously drawn point.

insertDeflectionLength

insertDeflectionLength: function( deflection,
length )

Insert a point in the current sketch given a deflection and a length. The deflection should be degrees clockwise from the previously digitized segment.

Parameters

deflection	{Number} Degrees clockwise from the previous segment.
length	{Number} Distance from the previously drawn point.

getCurrentPointIndex

getCurrentPointIndex: function()

Returns

{Number} The index of the most recently drawn point.

undo

undo: function()

Remove the most recently added point in the sketch geometry.

Returns

{Boolean} A point was removed.

redo

redo: function()

Reinsert the most recently removed point resulting from an undo call. The undo stack is deleted whenever a point is added by other means.

Returns

{Boolean} A point was added.

freehandMode

freehandMode: function( evt )

Determine whether to behave in freehand mode or not.

Returns

{Boolean}

modifyFeature

modifyFeature: function( pixel,
drawing )

Modify the existing geometry given the new point

Parameters

pixel	{ALKMaps.Pixel} The updated pixel location for the latest point.
drawing	{Boolean} Indicate if we’re currently drawing.

drawFeature

drawFeature: function()

Render geometries on the temporary layer.

getSketch

getSketch: function()

Return the sketch feature.

Returns

{ALKMaps.Feature.Vector}

getGeometry

getGeometry: function()

Return the sketch geometry. If <multi> is true, this will return a multi-part geometry.

Returns

{ALKMaps.Geometry.LineString}

touchstart

touchstart: function( evt )

handle touchstart.

parameters

evt	{event} the browser event

returns

{boolean} allow event propagation

down

down: function( evt )

Handle mousedown and touchstart. Add a new point to the geometry and render it. Return determines whether to propagate the event on the map.

Parameters

evt	{Event} The browser event

Returns

{Boolean} Allow event propagation

move

move: function ( evt )

Handle mousemove and touchmove. Adjust the geometry and redraw. Return determines whether to propagate the event on the map.

Parameters

evt	{Event} The browser event

Returns

{Boolean} Allow event propagation

up

up: function ( evt )

Handle mouseup and touchend. Send the latest point in the geometry to the control. Return determines whether to propagate the event on the map.

Parameters

evt	{Event} The browser event

Returns

{Boolean} Allow event propagation

finishGeometry

finishGeometry: function()

Finish the geometry and send it back to the control.

dblclick

dblclick: function( evt )

Handle double-clicks.

Parameters

evt	{Event} The browser event

Returns

{Boolean} Allow event propagation