API Reference
Namespaces
Classes
Events
Global
Externals

Class: trendline

CIQ.Drawing. trendline

Trendline is a segment drawing that optionally displays a callout containing trend information.

new trendline()

Since:
  • 5.1.2
  • 8.8.0 Added to Basic Package and moved here from drawingAdvanced.js. Made callout optional and disabled by default, so trendline replaces segment in the drawing palette.

Extends

Members

chartsOnly :boolean

Set this parameter to true to restrict drawing from being rendered on a study panel.

This parameter may be set for all drawings, for a specific drawing type, or for a specific drawing instance. See examples.

Type:
  • boolean
Inherited From:
Overrides:
Example
// Set drawing instance to chartsOnly. Only this one drawing will be affected.
drawing.chartsOnly=true;
// Set a particular drawing prototype to chartsOnly. All drawings to type "difference" will be affected.
CIQ.Drawing["difference"].prototype.chartsOnly=true;
// Set all drawings to chartsOnly.
CIQ.Drawing.prototype.chartsOnly=true;

configs :Array.<string>

List of drawing settings to enable for this drawing. Some of the more common settings are: "color", "fillColor", "lineWidth", "pattern"; but for more complex drawings there are additional ones.

By resetting this array, you can control which settings are available for drawings of this type as well as any drawings that share the prototype with this drawing.

Type:
  • Array.<string>
Since:

  • 9.7.0

Inherited From:
Overrides:

dragToDraw :boolean

Used to set the user behavior for creating drawings.

By default, a drawing is created with this sequence:
move crosshair to staring point → click → move crosshair to ending point → click.

On a touch device this would be:
move crosshair to staring point → tap → move crosshair to ending point → tap.

Set dragToDraw to true to create the drawing with the following alternate sequence:
move crosshair to staring point → mousedown → drag → mouseup

On a touch device this would be:
move crosshair to staring point → press → drag → release.

This parameter is not compatible with drawings requiring more than one drag movement to complete, such as:

  • Channel
  • Continuous Line
  • Elliott Wave
  • Gartley
  • Pitchfork
  • Fibonacci Projection

Line and Ray have their own separate parameter, which also needs to be set in the same way, if this option is desired: CIQ.Drawing.line.prototype.dragToDraw=true;

This parameter may be set for all drawings compatible with it, for a specific drawing type, or for a specific drawing instance. See examples.

Type:
  • boolean
Inherited From:
Overrides:
Example
// set drawing instance to dragToDraw. Only this one drawing will be affected
drawing.dragToDraw=true;
// Set particular drawing prototype to dragToDraw. All drawings to type "difference" will be affected
CIQ.Drawing["difference"].prototype.dragToDraw=true;
// Set all drawings to dragToDraw
CIQ.Drawing.prototype.dragToDraw=true;

permanent :boolean

Set this to true to disable selection, repositioning, and deletion by the end user.

This parameter may be set for all drawings, for a specific drawing type, or for a specific drawing instance. See examples.

Type:
  • boolean
Inherited From:
Overrides:
Example
// set drawing instance to permanent. Only this one drawing will be affected
drawing.permanent=true;
// Set particular drawing prototype to permanent. All drawings to type "difference" will be affected
CIQ.Drawing["difference"].prototype.permanent=true;
// Set all drawings to permanent
CIQ.Drawing.prototype.permanent=true;

Methods

abort(forceClear)

This function is called to tell a drawing to abort itself. It should clean up any rendered objects such as DOM elements or toggle states. It does not need to clean up anything that it drew on the canvas.

Parameters:
Name Type Description
forceClear boolean

Indicates that the user explicitly deleted the drawing (advanced usage).
Inherited From:
Overrides:

adjust()

Called whenever periodicity changes so that drawings can adjust their rendering.

Inherited From:
Overrides:

boxToPixels(stx, panelName, box [, yAxis])

Converts a box represented by two corner coordinates [tick0,value0] and [tick1,value1] into pixel coordinates. This is important for drawing tools or any other device that requires the actual underlying price. This function is preferred over CIQ.convertBoxToPixels when used by drawing functions because it automatically returns the pixel values based off the values of the box as if they were values of the plot corresponding to the drawing's field property. CIQ.convertBoxToPixels usually returns the pixel values of the box assuming those values are the main series plot's values.

Parameters:
Name Type Argument Description
stx CIQ.ChartEngine

The chartEngine
panelName string

Panel on which the coordinates reside
box object

Box to convert

Properties
Name Type Argument Description
x0 number <optional>
y0 number <optional>
x1 number <optional>
y1 number <optional>
yAxis CIQ.ChartEngine.YAxis <optional>
Since:

  • 8.4.0

Inherited From:
Overrides:
Returns:

A converted box

Type
object

click(context, tick, value)

Called when a user clicks while drawing.

Parameters:
Name Type Description
context object

The canvas context.
tick number

The tick in the dataSet.
value number

The value (price) of the click.
Inherited From:
Overrides:
Returns:

True if the drawing is complete. Otherwise the kernel continues accepting clicks.

Type
boolean

construct(stx, panel)

Initializes the drawing

Parameters:
Name Type Description
stx CIQ.ChartEngine

The chart object.
panel CIQ.ChartEngine.Panel

The panel reference.
Inherited From:
Overrides:

copyConfig(withPreferences)

Instance function used to copy the relevant drawing parameters into itself. It just calls the static function.

Parameters:
Name Type Description
withPreferences boolean

set to true to return previously saved preferences
Since:

  • 3.0.0

Inherited From:
Overrides:

getLineColor(color [, ignoreHighlight])

Compute the proper color to use when rendering lines in the drawing.

Will use the color but if set to auto or transparent, will use the container's defaultColor. However, if color is set to auto and the drawing is based off a series or study plot, this function will return that plot's color. If drawing is highlighted will use the highlight color as defined in stx_highlight_vector style.

Parameters:
Name Type Argument Description
color string

Color string to check and use as a basis for setting. If not supplied, uses this.color.
ignoreHighlight boolean <optional>

True to ignore highlighting status when determining color (for example, if a label, or if determining fill color).
Since:
  • 7.0.0 Replaces setLineColor. Will return source line's color if auto.
  • 8.4.0 Added isLabel parameter.
  • 9.1.2 Changed name of isLabel parameter to ignoreHighlight.
Inherited From:
Overrides:
Returns:

Color to use for the line drawing

Type
string
Example
var trendLineColor=this.getLineColor();
		this.stx.plotLine(x0, x1, y0, y1, trendLineColor, "segment", context, panel, parameters);

highlight(highlighted)

Returns the highlighted state. Set this.highlighted to the highlight state. For simple drawings the highlighted state is just true or false. For complex drawings with pivot points for instance, the highlighted state may have more than two states. Whenever the highlighted state changes a draw() event will be triggered.

Parameters:
Name Type Description
highlighted Boolean

True to highlight the drawing, false to unhighlight
Inherited From:
Overrides:

intersected(tick, value, box)

Called to determine whether the drawing is intersected by either the tick/value (pointer location) or box (small box surrounding the pointer). For line-based drawings, the box should be checked. For area drawings (rectangles, circles) the point should be checked.

Parameters:
Name Type Description
tick number

The tick in the dataSet representing the cursor point.
value number

The value (price) representing the cursor point.
box object

x0, y0, x1, y1, r representing an area around the cursor, including radius.
Inherited From:
Overrides:
Returns:

An object that contains information about the intersection. This object is passed back to CIQ.Drawing.reposition when repositioning the drawing. Return false or null if not intersected. Simply returning true highlights the drawing.

Type
object

isAllowed(stx [, field])

Decides if a drawing can be created on the specified field.

Parameters:
Name Type Argument Description
stx CIQ.ChartEngine

The chart object.
field string <optional>

Field in the dataset, if something other than default.
Since:

  • 8.6.0

Inherited From:
Overrides:
Returns:

Whether a drawing can be made on the field.

Type
boolean

measure()

Should call this.stx.setMeasure() with the measurements of the drawing if supported.

Inherited From:
Overrides:

move(context, tick, value)

Called when the user moves while creating a drawing.

Parameters:
Name Type Description
context CanvasRenderingContext2D

Canvas context on which to render.
tick number

Tick in the dataSet.
value number

Value at position.
Inherited From:
Overrides:

pixelFromValue(panel, tick, value [, yAxis])

Returns the Y pixel location for the (split) unadjusted price rather than the displayed price for a drawing. This is important for drawing tools or any other device that requires the actual underlying price. This function is preferred over CIQ.ChartEngine#pixelFromValueAdjusted when used by drawing functions because it automatically returns the pixel based off the value of the plot corresponding the drawing's field property. CIQ.ChartEngine#pixelFromValueAdjusted usually returns the pixel of the main series plot's value.

Parameters:
Name Type Argument Description
panel CIQ.ChartEngine.Panel

The panel to get the value from
tick number

The tick location (in the dataSet) to check for an adjusted value
value number

The value
yAxis CIQ.ChartEngine.YAxis <optional>

The yaxis to use
Since:

  • 8.4.0

Inherited From:
Overrides:
Returns:

The pixel location of the plot whose field matches the field property of the drawing

Type
number

pointIntersection(tick, value, box, isPixels)

Returns true if the tick and value are inside the box

Parameters:
Name Type Description
tick number

The tick
value number

The value
box object

The box
isPixels boolean

True if tick and value are in pixels; otherwise, they assumed to be in ticks and untransformed y-axis values, respectively
Since:

  • 7.0.0 Added isPixels.

Inherited From:
Overrides:
Returns:

True if the tick and value are within the box

Type
boolean

reconstruct(stx [, obj])

Reconstruct a segment

Parameters:
Name Type Argument Description
stx CIQ.ChartEngine

The chart object
obj object <optional>

A drawing descriptor

Properties
Name Type Argument Description
col string <optional>

The line color
pnl string <optional>

The panel name
ptrn string <optional>

Optional pattern for line "solid","dotted","dashed". Defaults to solid.
lw number <optional>

Optional line width. Defaults to 1.
v0 number <optional>

Value (price) for the first point
v1 number <optional>

Value (price) for the second point
d0 number <optional>

Date (string form) for the first point
d1 number <optional>

Date (string form) for the second point
tzo0 number <optional>

Offset of UTC from d0 in minutes
tzo1 number <optional>

Offset of UTC from d1 in minutes
fld string <optional>

Field which drawing is associated with
Since:

  • 8.4.0 Added fld property to obj parameter.

Inherited From:
Overrides:

render(context)

Called to render the drawing.

Parameters:
Name Type Description
context CanvasRenderingContext2D

Canvas context on which to render.
Inherited From:
Overrides:

reposition(context, repositioner, tick, value)

Called when the user attempts to reposition a drawing. The repositioner is the object provided by CIQ.Drawing.intersected and can be used to determine which aspect of the drawing is being repositioned. For instance, this object may indicate which point on the drawing was selected by the user. It might also contain the original coordinates of the point or anything else that is useful to render the drawing.

Parameters:
Name Type Description
context object

The canvas context.
repositioner object

The repositioner object.
tick number

Current tick in the dataSet for the mouse cursor.
value number

Current value in the dataSet for the mouse cursor.
Inherited From:
Overrides:

serialize()

Serialize a drawing into an object.

Inherited From:
Overrides:

setLineColor()

Compute the proper color to use when rendering lines in the drawing.

Since:
  • 4.0.0
  • 7.0.0 Deprecated
Inherited From:
Overrides:
Deprecated:

setPoint(point, x, y [, chart])

Sets the internal properties of the drawing points where x is a tick or a date and y is a value.

Parameters:
Name Type Argument Description
point number

index to point to be converted (0,1)
x number | string

index of bar in dataSet (tick) or date of tick (string form)
y number

price
chart CIQ.ChartEngine.Chart <optional>

Optional chart object
Since:
  • 04-2015
  • 8.3.0 x tick values outside an allowable range will be replaced by values at the edge of the range. This is to prevent performance problems when switching periodicities.
Inherited From:
Overrides:

valueFromPixel(pixel [, panel] [, yAxis])

Returns the value (price) of a drawing given a y-axispixel. The value is relative to the panel or the canvas. This function is preferred over CIQ.ChartEngine#valueFromPixel when used by drawing functions because it automatically returns the value based off the plot corresponding the drawing's field property. CIQ.ChartEngine#valueFromPixel usually returns the value of the main series plot.

Parameters:
Name Type Argument Description
pixel number

The y pixel position
panel CIQ.ChartEngine.Panel <optional>

A panel object. If passed then the value will be relative to that panel. If not passed then the value will be relative to the panel that is in the actual Y location.
yAxis CIQ.ChartEngine.YAxis <optional>

Which yAxis. Defaults to panel.yAxis.
Since:

  • 8.4.0

Inherited From:
Overrides:
Returns:

The value relative to the panel, of the plot whose field matches the field property of the drawing

Type
number