TPadPainter

TPadPainter

(private) new TPadPainter(dom, pad, iscanopt)

Painter for TPad object

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Parameters:
Name Type Attributes Description
dom object | string

DOM element for drawing or element id
pad object

TPad object to draw
iscan boolean <optional>

if TCanvas object

Methods

(private) addObjectPainter()

Add object painter to list of primitives

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(private) addPadButton()

Add button to the pad

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(private) addPadButtons()

Add buttons for pad or canvas

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(private) addPadInteractive()

Add pad interactive features like dragging and resize

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(async, private) buildLegend()

add legend object to the pad and redraw it

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(private) changeDarkMode()

Changes canvas dark mode

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checkCanvasResize() → {Promise}

Check resize of canvas

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Returns:

with result or false

Type
Promise

checkSpecial() → {boolean}

Check if it is special object, which should be handled separately

Description:

  • It can be TStyle or list of colors or palette object

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Returns:

true if any

Type
boolean

checkSpecialsInPrimitives()

Check if special objects appears in primitives

Description:

  • it could be list of colors or palette

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cleanPrimitives()

Cleanup primitives from pad - selector lets define which painters to remove

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cleanup()

cleanup pad and all primitives inside

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clickPadButton()

Process pad button click

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(private) confirmDraw()

confirms that drawing is completed, may trigger next drawing immediately

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createCanvasSvg()

Create SVG element for canvas

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(async, private) createImage() → {Promise}

Create image for the pad

Description:

  • Used with web-based canvas to create images for server side

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Returns:

with image data, coded with btoa() function

Type
Promise

createPadSvg()

Create main SVG element for pad

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Returns:

true when pad is displayed and all its items should be redrawn

(private) decodeOptions()

Decode pad draw options

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(private) deliverWebCanvasEvent()

Deliver mouse move or click event to the web canvas

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disablePadDrawing()

Disable pad drawing

Description:

  • Complete SVG element will be hidden

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(async, private) divide() → {Promise}

Divide pad on subpads

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Returns:

when finished

Type
Promise

(private) doingDraw()

indicates if painter performing objects draw

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(private) drawActiveBorder()

Draw pad active border

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(private) drawItemNameOnCanvas()

Draw item name on canvas if gStyle.fOptFile is configured

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(async, private) drawNextSnap() → {Promise}

Function called when drawing next snapshot from the list

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Returns:

for drawing of the snap

Type
Promise

(async) drawObject()

Draw single primitive

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(async, private) drawPrimitives() → {Promise}

Draw pad primitives

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Returns:

when drawing completed

Type
Promise

enlargePad()

Enlarge pad draw element when possible

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(private) fillContextMenu()

Fill pad context menu

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findActivePad() → {Object}

Search active pad

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Returns:

pad painter for active pad

Type
Object

(private) findInPrimitives()

try to find object by name in list of pad primitives

Description:

  • used to find title drawing

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(private) findPainterFor(selobj, selnameopt, seltypeopt) → {object}

Try to find painter for specified object

Description:

  • can be used to find painter for some special objects, registered as histogram functions

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Parameters:
Name Type Attributes Description
selobj object

object to which painter should be search, set null to ignore parameter
selname string <optional>

object name, set to null to ignore
seltype string <optional>

object type, set to null to ignore
Returns:
  • painter for specified object (if any)
Type
object

(private) findSnap()

Return painter with specified id

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(private) forEachPainterInPad(userfunc, kind)

Call function for each painter in pad

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Parameters:
Name Type Description
userfunc function

function to call
kind string

'all' for all objects (default), 'pads' only pads and subpads, 'objects' only for object in current pad

(private) getAutoColor()

Provides automatic color

Description:

  • Uses ROOT colors palette if possible

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(private) getCustomPalette()

returns custom palette associated with pad or top canvas

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(private) getFramePainter()

Returns frame painter inside the pad

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getFrameRect()

Returns frame coordiantes - also when frame is not drawn

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(private) getMainPainter()

Returns main painter on the pad

Description:

  • Typically main painter is TH1/TH2 object which is drawing axes

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(private) getNumPainters()

Returns number of painters

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getPadHeight()

get pad height

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getPadLog()

return pad log state x or y are allowed

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(private) getPadRanges()

returns actual ranges in the pad, which can be applied to the server

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getPadRect()

get pad rect

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getPadWidth()

get pad width

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getRootPad()

return RPad object

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(private) getSubPadPainter()

Return sub-pads painter, only direct childs are checked

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(private) getWebPadOptions()

Collects pad information for TWebCanvas

Description:

  • need to update different states

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hasObjectsToDraw()

Return true if any objects beside sub-pads exists in the pad

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(private) isBatchMode()

Indicates that drawing runs in batch mode

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isEditable()

Returns true if pad is editable

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(private) isGrayscale()

Returns true if canvas configured with grayscale

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isPadEnlarged()

Return true if this pad enlarged

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(private) isRoot6()

Indicates that is is Root6 pad painter

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(private) itemContextMenu()

Show context menu for specified item

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(private) needRedrawByResize()

Checks if pad should be redrawn by resize

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(async, private) padContextMenu()

Show pad context menu

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(private) processPadTooltipEvent()

Process tooltip event in the pad

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(private) processSnapColors()

Process snap with colors

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(private) processSnapFont()

Process snap with custom font

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(private) processSnapStyle()

Process snap with style

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(private) processSpecialSnaps() → {Promise}

Process special snaps like colors or style objects

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Returns:

index where processing should start

Type
Promise

(async) produceImage() → {Promise}

Prodce image for the pad

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Returns:

with created image

Type
Promise

(private) producePadEvent()

Generate pad events, normally handled by GED

Description:

  • in pad painter, while pad may be drawn without canvas

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redraw()

redraw pad

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(async) redrawPad() → {Promise}

Redraw pad means redraw ourself

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Returns:

when redrawing ready

Type
Promise

(async, private) redrawPadSnap() → {Promise}

Redraw pad snap

Description:

  • Online version of drawing pad primitives for the canvas snapshot contains list of objects as first entry, graphical properties of canvas itself is provided in ROOT6 it also includes primitives, but we ignore them

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Returns:

with pad painter when drawing completed

Type
Promise

registerForPadEvents()

register for pad events receiver

Description:

  • in pad painter, while pad may be drawn without canvas

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(private) removePrimitive()

Removes and cleanup specified primitive

Description:

  • also secondary primitives will be removed

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Returns:

new index to continue loop or -111 if main painter removed

saveAs(kind, full_canvas, filenameopt)

Save pad as image

Description:

  • Normally used from context menu

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Example
import { getElementCanvPainter } from 'https://root.cern/js/latest/modules/base/ObjectPainter.mjs';
let canvas_painter = getElementCanvPainter('drawing_div_id');
canvas_painter.saveAs('png', true, 'canvas.png');
Parameters:
Name Type Attributes Description
kind string

format of saved image like 'png', 'svg' or 'jpeg'
full_canvas boolean

does complete canvas (true) or only frame area (false) should be saved
filename string <optional>

name of the file which should be stored

selectObjectPainter()

method redirect call to pad events receiver

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(private) setFastDrawing()

Set fast drawing property depending on the size

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(private) setGrayscale()

Set grayscale mode for the canvas

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(private) setMainPainter()

Assign main painter on the pad

Description:

  • Typically main painter is TH1/TH2 object which is drawing axes

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(private) showPadButtons()

Show pad buttons

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(private) svg_this_pad()

Returns SVG element for the pad itself

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(private) syncDraw(kind) → {Promise}

sync drawing/redrawing/resize of the pad

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Parameters:
Name Type Description
kind string

kind of draw operation, if true - always queued
Returns:

when pad is ready for draw operation or false if operation already queued

Type
Promise

updateObject()

Update TPad object

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(async, static) draw()

draw TPad object

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