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Object PmgCanvas (Drawing canvas)

Description:
See: PmgCanvas - Deatiled object description

The PmgCanvas object allows to draw both veri simple and complex animated shapes in 2D graphics. The drawing is controlled by script (JavaScript) in the onDraw event and by using the methods and properties of the CanvasCtx drawing area (eventually by extension object CanvasCtxExt). It allows to draw simple images (for example icons), but also complex animated graphics (animated meters, etc.).
This object adopts properties and methods of the PmgObject object.
:
CtxReset Set CanvasCtx into non-initialized empty state
:
AddEvent Registers a function into selected event
Blink Starts/stops blinking of the Pmg object
Dx Width of the Pmg object
Dy Height of the Pmg object
Enabled Enable/disable the control, i.e. user's inputs to the object
Focus Detects/set the focus of the Pmg object
GetChildByIndex Returns the nested Pmg object defined by order
GetChildCount Returns the number of nested Pmg objects
GetPathName Name of the Pmg object including the path that consists of parent Pmg objects names
GetItemInfo Returns special information regarding the Pmg object
GetPar Reading the value of the Pmg object parameter (or its parents)
IniDx Initial width of the Pmg object
IniDy Initial height of the Pmg object
IniX Initial X-position of the upper-left corner of the Pmg object relative to superior object
IniY Initial Y-position of the upper-left corner of the Pmg object relative to superior object
Items Returns reference to Pmg object
Methods Access to designer's methods of this object
MouseOn Identification if the mouse cursor finds itself over the Pmg object
Name The name of the Pmg object
Parent Returns reference to the parent Pmg object
Pm Returns the Pma object or to its subobject (obsolete)
PmPanel Returns reference to the PmaPanel object where the Pmg object is placed
Refresh Refresh of the Pmg object
RemoveEvent Deregisters the function in the specified event
Root Returns reference to the root PmgRoot object
ShowMenu Opens local menu of the Pmg object
ScreenX X-coordinate of the upper-left corner of the Pmg object relative to computer screen
ScreenY Y-coordinate of the upper-left corner of the Pmg object relative to computer screen
ToolTip Tooltip text of the Pmg object
Vars Returns the variable of the Pmg object
ViewX Position of X-coordinate of the upper-left corner of the Pmg object relative to the PmgRoot object
ViewY Position of the Y-coordinate of the upper-left corner of the Pmg object relative to the PmgRoot object
Visible Sets the visibility/invisibility of the Pmg object
X X-coordinate of the upper-left corner of the Pmg object relative to superior Pmg object
Y Y-coordinate of the upper-left corner of the Pmg object relative to superior Pmg object
:
onStart Is triggered on the construction of the Pmg object in the course of opening the panel
onStop Is triggered on the destruction of the Pmg object in the course of closing the panel
onRefresh Is triggered on the data refresh of the Pmg object
onKeyPress Is triggered after pressing or releasing the key of the keyboard
onMousePress Is triggered after pressing or releasing the left mouse button
onMenuFill Is triggered after pressing by the right mouse button over the Pmg object
onMenuSelect Is triggered on the selection of an item from the Pmg object local menu
onModeChange Is triggered when the Pmg object mode changes
onFocusIn Is triggered if the object receives focus
onFocusOut Is triggered if the object loses focus
Configuration tabs:
Object General information about the object
Position Setting the position, width and height of the Pmg object
Variables List and configuration of user defined Pmg object variables
Events Algorithms definition for the object events
Methods Definition of designer's method of the Pmg object
Draw The onDraw event for drawing into the CanvasCtx drawing area.
Canvas Properties of the PmgCanvas object.
See also:
- CanvasCtx (object)
- CanvasCtxExt (object)
- The onDraw event
History:
Pm9.00.00: Object name changed: PmiCanvas -> PmgCanvas
Pm8.03.28: Fixed bug: The read value of the color (for example of the strokeStyle property) was incorrect.
Pm8.03.13: Fixed bug: Memory decrease occured if methods save and restore were not called correctly (not in pair).
Pm8.03.08: New simple drawing tool has been created. This way it is possible to draw the canvas object and the editor then transforms it to script.
This tool will be developed further in future versions in order to provide more graphic functions and also to read and render canvas scripts.
The canvas drawing tool can now be opened from following locations:
- Select preconfiguration / Image / Drawing PmgCanvas graphics or
- On the "Draw" tab - when creating new method select option "draw PmgCanvas image" or
- On the "Draw" tab - in script editor local menu select Canvas editor ....
Pm8.03.04:
- On the "Draw" tab it is now possible to create assistant methods for drawing. In the onDraw event it is no longer neede to write the whole drawing script, but assistant methods can be called. This way the drawing script becomes much simpler.
- New CanvasCtxExt object for drawing. This object adds the functions of deformation rotation transformations. The object can be accessed via the pEvent.CtxExt parameter.
Pm8.02.11: new preconfigurations for intelligent valves and pumps.
Pm8.02.07: Created
PROMOTIC 9.0.16 SCADA system documentation - MICROSYS, spol. s r.o.

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