Inherits DD::Image::Knob.

Public Types
enum	{ DELETE_KEY, MAYBE_SET_KEY, SET_KEY, ADD_KEY, NO_ANIMATION, AUTOKEY_ON, AUTOKEY_OFF, EDIT_CURVE, COPY_KEY, PASTE_KEY, COPY_ALL, PASTE_ALL, SPLIT, UNSPLIT }

Public Types inherited from DD::Image::Knob
enum	CallbackReason { kDestroying, kIsVisible, kUpdateWidgets, kChanged }

enum	HandleType { INVALID, POSITION, SELECTABLE, DISTANCE_FROM_POINT, DISTANCE_WITH_SNAP, ANYWHERE, ANYWHERE_MOUSEMOVES, ANYWHERE_KEY_PRESSED, SELECTED_BY_THIS }

enum	HandleFlags { HOVER, USE_CURRENT_COLOR, LOW_PRIORITY, DO_HANDLE_CALLBACK_ON_SHIFT_SELECT }

typedef std::vector< int >	SelectedIndexVector

typedef U64	FlagMask

typedef int(*	Callback) (void *closure, CallbackReason)

typedef std::vector< int >	TKnobIndices

typedef bool(	HandleBatch) (ViewerContext ctx, Knob , const int focusIndex, const TKnobIndices &indices)

typedef bool(	Handle) (ViewerContext ctx, Knob , int index)

Public Member Functions
	ShapeKnob (Knob_Closure cb, const char name, const char shapename="shape", const char label=nullptr)

int	keys () const

float	time (int key) const

float	shape (double time) const
	Evaluate the shape curve at time. If the time is between two keys, this will return a number between those two key numbers. If there are less than 2 keys this always returns 0. More...

bool	is_animated () const

virtual bool	keyable () const =0

bool	autokey () const

virtual bool	from_script (const char *v)=0

virtual void	to_script (std::ostream &, const OutputContext *, bool quote) const =0

int	get_key_list (std::set< int > &) const

Public Member Functions inherited from DD::Image::Knob
void	setClaimedName (const std::string &claimedName)

const std::string &	claimedName ()

void	setDefaultName (const std::string &defaultName)

void	setDrawHandleTypes (DrawHandleTypeMask drawHandleTypes)

DrawHandleTypeMask	drawHandleTypes () const

const std::string &	defaultName () const

	Knob (Knob_Closure c, const char name, const char *label=nullptr)

virtual const char *	Class () const =0

virtual int	ClassID () const

virtual ArrayKnobI *	arrayKnob ()

virtual ResizableArrayKnobI *	resizableArrayKnob ()

virtual StringKnobI *	stringKnob ()

virtual ScriptKnobI *	scriptKnob ()

virtual Enumeration_KnobI *	enumerationKnob ()

virtual Colorspace_KnobI *	colorspaceKnob ()

virtual SceneView_KnobI *	sceneViewKnob ()

virtual MultiArray_KnobI *	multiArrayKnob ()

virtual List_KnobI *	listKnob ()

virtual Table_KnobI *	tableKnob ()

virtual Geo_KnobI *	geoKnob ()

virtual Axis_KnobI *	axisKnob ()

virtual PositionVector_KnobI *	positionVectorKnob ()

virtual PluginPython_KnobI *	pluginPythonKnob ()

virtual GeoSelect_KnobI *	geoSelectKnob ()

virtual ControlPointCollection_KnobI *	controlPointCollectionKnob ()

virtual MetaKeyFrame_KnobI *	metaKeyFrameKnob ()

virtual TransformJack_KnobI *	transformJackKnob ()

virtual Transform2d_KnobI *	transform2dKnob ()

virtual Ripple_KnobI *	rippleKnob ()

virtual File_KnobI *	fileKnob ()

virtual LookupCurves_KnobI *	lookupCurvesKnob ()

virtual ColorKnobI *	colorKnob ()

virtual AnimationHolderI *	animationKnob ()

virtual LinkKnobI *	linkKnob ()

VersionNumbers *	version ()

VersionNumbers *	version () const

Node *	node () const

void	set_node (Node *n)

Op *	op () const

const std::string &	name () const

void	name (const char *p)

bool	is (const char *v) const

bool	startsWith (const char *v) const

const std::string &	label () const

const std::string &	labelToUse () const

bool	labelNotNull () const

void	label (const char *)

bool	canCopyValue () const

bool	canSaveValueToPreset () const

std::string	fullyQualifiedName (int idx=-1) const

const char *	label_c_str () const

const char *	name_c_str () const

const std::string &	tooltip () const

void	tooltip (const std::string &p)

void	flags (FlagMask f) noexcept

void	set_flag (FlagMask f) noexcept

void	clear_flag (FlagMask f) noexcept

void	invert_flag (FlagMask f) noexcept

void	set_flag (FlagMask f, bool b) noexcept

FlagMask	flags () const noexcept

bool	flag (FlagMask f) const noexcept

bool	any_of (FlagMask f) const noexcept

bool	all_of (FlagMask f) const noexcept

virtual bool	priority_undo () const

virtual WidgetPointer	make_widget (const WidgetContext &context)
	this is the new version for 7.0 onwards More...

virtual WidgetPointer	make_secondary_widget (const WidgetContext &context)

virtual void	updateUI (const OutputContext &)

void	addCallback (Callback cb, void *closure)

void	removeCallback (Callback cb, void *closure)

bool	isCallbackRegistered (Callback cb, void *closure) const

bool	isEnabled () const

void	enable ()

void	disable ()

virtual void	enable (bool)

virtual bool	disabledDueToLicensing () const

virtual bool	isReadOnly () const

void	setReadOnly (bool value)

bool	isReadOnlyInScripts () const

void	setReadOnlyInScripts ()

bool	isVisible () const

bool	isHandleVisible () const

int	openLinkCount () const
	the number of panels open which contain a link knob pointing at this knob

virtual void	openLink ()
	increase the openLinkCount

virtual void	closeLink ()
	decrease the openLinkCount

void	hide ()

void	show ()

void	visible (bool)

bool	isOpen () const

void	open ()

void	close ()

void	open (bool)

bool	isPushed () const

void	pushed (bool p)

Knob *	knob (const char *) const

Knob *	knob (int) const

bool	node_disabled () const

bool	panel_visible () const

bool	node_selected () const

unsigned	node_gl_color () const

bool	script_command (const char *command, bool py=true, bool eval=true) const

bool	script_expand (const char *str, int what=1) const

virtual void	reset_to_default ()

virtual bool	build_handle (ViewerContext *)

void	add_draw_handle (ViewerContext *)

virtual void	draw_handle (ViewerContext *)

void	begin_handle (HandleContext command, ViewerContext ctx, Handle cb, int index, const DD::Image::Vector3 &pos, ViewerContext::Cursor cursor=ViewerContext::kNoCursor)

void	begin_handle (ViewerContext ctx, Handle cb, int index, const DD::Image::Vector3 &pos, ViewerContext::Cursor cursor=ViewerContext::kNoCursor)

void	begin_handle (HandleContext command, ViewerContext ctx, Handle cb, int index, float x=0, float y=0, float z=0, ViewerContext::Cursor cursor=ViewerContext::kNoCursor)

void	begin_handle (ViewerContext ctx, Handle cb, int index, float x=0, float y=0, float z=0, ViewerContext::Cursor cursor=ViewerContext::kNoCursor)

void	end_handle (ViewerContext *ctx)

void	make_handle (HandleContext command, ViewerContext ctx, Handle cb, const int index, const DD::Image::Vector3 &pos, const ViewerContext::Cursor cursor=ViewerContext::kNoCursor)

void	make_handle (ViewerContext ctx, Handle cb, const int index, const DD::Image::Vector3 &pos, const ViewerContext::Cursor cursor=ViewerContext::kNoCursor)

void	make_handle (HandleContext command, ViewerContext ctx, Handle cb, const int index, const float x, const float y, const float z=0.0f, const ViewerContext::Cursor cursor=ViewerContext::kNoCursor)

void	make_handle (ViewerContext ctx, Handle cb, const int index, const float x, const float y, const float z=0.0f, const ViewerContext::Cursor cursor=ViewerContext::kNoCursor)

bool	is_selected (ViewerContext ctx, Handle cb, int index) const

virtual bool	is_selected (ViewerContext *ctx, int index) const

void	get_selected_indices (Handle *cb, SelectedIndexVector &allIndices) const

bool	clear_selected (ViewerContext *)

bool	toggle_selected (ViewerContext ctx, Handle cb, int index)

virtual bool	toggle_selected (ViewerContext *ctx, int index)

bool	is_focused (ViewerContext , Handle cb, int index)

int	selection_size (ViewerContext *)

void	add_to_undo ()

void	stop_add_to_undo ()

void	new_undo (const char *name=nullptr)

void	extra_undo ()

void	new_undo (const void *controller)

bool	doingUndoRedo ()

virtual Knob *	undoer ()

void	setUndoer (Knob *undoer)

void	new_nudge_undo ()

void	undo ()

void	redo ()

virtual void	changed ()

void	updateWidgets ()

void	asapUpdate ()

void	asapUpdate (const Box &box, int direction=0)

void	redraw ()

void	undoless (bool undoless)

const OutputContext &	uiContext () const

const Format &	input_format () const

virtual void	store (StoreType, void *p, Hash &hash, const OutputContext &context)

virtual void	append (Hash &hash, const OutputContext *context)

virtual int	get_key_list (std::set< int > &keylist, int index) const

virtual bool	splitForViews () const

virtual ViewSet	storedViews () const

virtual bool	keyframesDisplayed () const

bool	set_text (const char *v)

bool	to_double (const char *, double &result)

bool	to_int (const char *, int &result)

bool	to_bool (const char *, bool &result)

virtual const char *	get_text (const OutputContext *=nullptr) const

virtual void	to_script_prefix (std::ostream &) const

virtual void	to_script_userknob (std::ostream &) const

virtual bool	not_default () const

void *	pyObject ()

void	setPyObject (void *s)

KnobImpl *	pImpl ()

Public Member Functions inherited from DD::Image::ValueStuffI
virtual int	value_stuff (int what, ValueStuffArg *user=nullptr) const

bool	set_value (double v, int channel=-1)

bool	set_value_at (double v, double time, int channel=-1)

bool	set_value_at_view (double v, double time, int view, int channel=-1)

bool	set_key (int channel=-1, int view=-1)

bool	set_key_at (double time, int channel=-1, int view=-1)

bool	set_values (const double *array, int n)

bool	set_values_at (const double *array, int n, double time)

bool	set_values (const float *array, int n)

bool	set_values_at (const float *array, int n, double time)

bool	set_values (const int *array, int n)

bool	set_values_at (const int *array, int n, double time)

bool	set_values (const U64 *array, int n)

bool	set_values_at (const U64 *array, int n, double time)

bool	remove_key (int channel=-1)

bool	remove_key_at (double time, int channel=-1, int view=-1)

void	set_range (double a, double b, bool force=false)

void	set_animation (const char *a, int channel=-1)

bool	is_key_at (double time, int channel=-1, int view=-1) const

bool	is_key (int channel=-1) const

double	get_value (int channel=0) const

double	get_value_at (double time, int channel=0) const

double	get_value_at_view (double time, int view, int channel=0) const

double	get_value_at (const OutputContext &oc, int channel=0) const

bool	set_expression (const char *v, int channel, int view=-1)

int	getNumKeys (int channel=-1, int view=-1) const

int	getKeyIndex (double &time, int channel=-1, int view=-1) const

bool	split_view (int view)

bool	unsplit_view (int view)

void	getKeyFrame (int keyindex, double &x, double &y, double &lslope, double &rslope, double &la, double &ra, unsigned char &interp, unsigned char &extrap, int channel, int view=-1) const

void	setKeyFrame (int keyindex, double x, double y, double lslope, double rslope, double la, double ra, unsigned char interp, unsigned char extrap, int channel, int view=-1) const

void	addKeyFrame (double x, double y, double lslope, double rslope, double la, double ra, unsigned char interp, unsigned char extrap, int channel, int view=-1) const

void	get_expression (std::string &expr, int channel=-1, int view=-1)

double	getKeyTime (int keyindex, int channel=-1, int view=-1) const

double	getDerivative (double time, int channel=0, int view=-1) const

double	getNthDerivative (int n, double time, int channel=0, int view=-1) const

double	getIntegral (double t1, double t2, int channel=0, int view=-1) const

double	getInverse (double value, int channel=0, int view=-1) const

double	getInverseGeneral (double value, int channel=0, int view=-1) const

bool	set_animated (int channel=-1) const

bool	is_animated (int channel=-1)

bool	clear_animated (int channel=-1)

bool	clear_animated_view (int view, int channel=-1)

bool	set_animated_view (int view, int channel=-1)

bool	is_animated_view (int view, int channel=-1)

bool	toggle ()

bool	set_input (int input)

Public Attributes
Knob *	i
	points at a ShapeController_Knob

Protected Member Functions
bool	handle (int event, double frame)

virtual bool	goto_shape (float shape, const DD::Image::OutputContext &context)=0

bool	goto_context (const DD::Image::OutputContext &oc)

bool	goto_frame (float frame)

bool	keys (int n, float delta=1)

bool	set_key_at (double time)

bool	maybe_set_key ()

bool	no_animation ()

Friends
class	::ShapeController_Knob

Additional Inherited Members
Static Public Member Functions inherited from DD::Image::Knob
static void	addTooltipOverride (const std::string &knob, const std::string &tooltip)

static const char *	script_result (bool py=false)

static void	script_unlock ()

static int	message (char t, const char *,...)

static int	vmessage (char t, const char *, va_list)

static Indent *	indent ()

static void	error (const char *lpFormat,...)

static void	warning (const char *lpFormat,...)

static void	critical (const char *lpFormat,...)

static void	debug (const char *lpFormat,...)

static void	error (Knob lpKnob, const char lpFormat,...)

static void	warning (Knob lpKnob, const char lpFormat,...)

static void	critical (Knob lpKnob, const char lpFormat,...)

static void	debug (Knob lpKnob, const char lpFormat,...)

Static Public Attributes inherited from DD::Image::Knob
static constexpr const FlagMask	DISABLED
	Grey out and lock interface. Prevents copy/paste (see READ_ONLY to allow this).

static constexpr const FlagMask	NO_ANIMATION
	Disable right click and button animation menu.

static constexpr const FlagMask	DO_NOT_WRITE
	Disables calling to_script. No writing to script file or copy/paste.

static constexpr const FlagMask	INVISIBLE
	Disables param and viewer widgets. Cannot be made visible again. See HIDDEN for this.

static constexpr const FlagMask	RESIZABLE
	Allows more complex knobs to resize param panel to fill available space.

static constexpr const FlagMask	STARTLINE
	Start a new line in the param panel before knob widget.

static constexpr const FlagMask	ENDLINE
	Start a new line in the param panel after knob widget.

static constexpr const FlagMask	NO_RERENDER
	Removes knob from Op hash calculation, preventing rerendering on value change.

static constexpr const FlagMask	NO_HANDLES
	Disables viewer widget handles from drawing.

static constexpr const FlagMask	KNOB_CHANGED_ALWAYS
	Always calls knob_changed, regardless of whether it has previously returned false.

static constexpr const FlagMask	NO_KNOB_CHANGED
	Prevents knob_changed being called on value change. Set if prev knob_changed returned false.

static constexpr const FlagMask	HIDDEN
	Disables param panel and viewer widgets. Can be managed dynamically with show/hide.

static constexpr const FlagMask	NO_UNDO
	Disables laying down of undo/redo points.

static constexpr const FlagMask	ALWAYS_SAVE
	Forces data to always be written regardless. Deprecated. Override not_default instead.

static constexpr const FlagMask	NODE_KNOB
	For internal use only.

static constexpr const FlagMask	HANDLES_ANYWAY
	Force viewer widgets to be visible regardless of current node tab.

static constexpr const FlagMask	INDETERMINATE
	Presents a blacked out undefined value interface on supporting knobs.

static constexpr const FlagMask	COLOURCHIP_HAS_UNSET
	Defines whether a color chip can be in the 'unset' state. Defaults to false.

static constexpr const FlagMask	SMALL_UI
	Switches param panel widget to be more viewer Toolbar friendly in supported knobs (eg Button).

static constexpr const FlagMask	NO_NUMERIC_FIELDS
	Disables numeric input box widget on supported knobs.

static constexpr const FlagMask	KNOB_CHANGED_RECURSIVE
	Recursive knob_changed calls are prevented unless overriden using this flag.

static constexpr const FlagMask	READ_ONLY
	As with DISABLED, except value can be copied from and expression linked against.

static constexpr const FlagMask	NO_CURVE_EDITOR
	Disables curve editor.

static constexpr const FlagMask	NO_MULTIVIEW
	Disables view menu and splitting when in a multiview script.

static constexpr const FlagMask	EARLY_STORE
	Forces early synchronisation of data allowing usage in pre-op calls such as split_input().

static constexpr const FlagMask	MODIFIES_GEOMETRY
	Should be set on all knobs which modify geometry or associated transforms.

static constexpr const FlagMask	OUTPUT_ONLY
	Similar to READ_ONLY & NO_RERENDER together - data changes don't count as a script change.

static constexpr const FlagMask	NO_KNOB_CHANGED_FINISHED
	Prevents knob_changed_finished being called on value change. Set if prev call returned false.

static constexpr const FlagMask	SET_SIZE_POLICY
	Do not use.

static constexpr const FlagMask	EXPAND_TO_WIDTH
	Force knob to expand to fill available space. - only for Enum knobs currently.

static constexpr const FlagMask	NEVER_DRAW_HANDLES
	Disables viewer widget handles from drawing. Unlike the NO_HANDLES flag, the state of this flag will never change internally within Nuke.

static constexpr const FlagMask	KNOB_CHANGED_RIGHTCONTEXT
	Always call knob_changed on a properly cooked Op, even if KNOB_CHANGED_ALWAYS is on.

static constexpr const FlagMask	DONT_SAVE_TO_NODEPRESET
	This value of this knob should never be saved to a NodePreset. Can be used, for example, for data knobs.

static constexpr const FlagMask	RESERVED_COLORCHIP_KNOB
	DO NOT USE. This value is used by the colorchip knob.

static constexpr const FlagMask	READ_ONLY_IN_SCRIPTS
	Prevents knobs from being modified from Python/Tcl.

static constexpr const FlagMask	ALWAYS_ALIGN_LABEL_TOP
	Label is always aligned to the top of the Knob.

static constexpr const FlagMask	TINY_SLIDER
	Modifies SLIDER to be a tiny slider underneath lineedit. Should be a numeric knob flag but we've overrun the < 0x80 condition.

static constexpr const FlagMask	HIDE_ANIMATION_AND_VIEWS
	Prevents Animation Curve_Knob and Views being shown. Animation is still possible, unless NO_ANIMATION is set of course.

static constexpr const FlagMask	NO_COLOR_DROPDOWN
	Prevents Color Panel Dropdown from being available. Popup color panel will stil be available.

static constexpr const FlagMask	NODEGRAPH_ONLY
	Indicate that this knob should only be displayed when using the NodeGraph, since the Timeline uses gpuEngine, which might not support all the same knobs.

static constexpr const FlagMask	NO_SCRIPT_EXECUTE
	Prevents 'execute' being called on the knob.

static constexpr const FlagMask	MODIFIES_TIME
	Should be set on all knobs which modify timing.

static constexpr const FlagMask	TOOLBAR_BUTTON_DRAWSTYLE
	This knob must be drawn in the style of Viewer toolbar knobs.

static constexpr const FlagMask	FLAGS_LOCKED
	Used to lock modifications to this knobs flags.

static constexpr const FlagMask	MAGNITUDE
	Enables switchable numeric box & slider to multiple boxes (array knob derived numeric knobs).

static constexpr const FlagMask	SLIDER
	Enables slider on single numeric knob, or array knob with MAGNITUDE set (numeric knobs).

static constexpr const FlagMask	LOG_SLIDER
	Switches linear slider to log slider, or cubic depending on range (numeric knobs with SLIDER).

static constexpr const FlagMask	STORE_INTEGER
	Stores and presents integer value rather than float (numeric knobs).

static constexpr const FlagMask	FORCE_RANGE
	Forces stored and presented value to be clamped to range set (numeric knobs).

static constexpr const FlagMask	ANGLE
	Switches widget for angle UI (single value numeric knobs).

static constexpr const FlagMask	NO_PROXYSCALE
	Disables proxyscaling on knobs supporting it (XY_Knob & WH_Knob derivatives).

static constexpr const FlagMask	GRANULAR_UNDO
	Disables concatenation of minor undo events (string knobs)

static constexpr const FlagMask	NO_RECURSIVE_PATHS
	Badly named. Actually disables relative paths (string knobs).

static constexpr const FlagMask	NO_TCL_ERROR
	For strings containing TCL expressions, don't replace with TCL error messages if an error occurs.

static constexpr const FlagMask	SAVE_MENU
	Forces menu entries to be written to script. Used by dynamic menus (enumeration knobs).

static constexpr const FlagMask	EXPAND_TO_CONTENTS
	Make Enumeration knobs adjust their width to the size of the largest munu item.

static constexpr const FlagMask	EXACT_MATCH_ONLY
	invalid value, the knob will be put into an Error state. More...

static constexpr const FlagMask	STRIP_CASCADE_PREFIX
	Make Cascading Enumeration knobs not serialise out cascading prefixes.

static constexpr const FlagMask	SINGLE_SELECTION_ONLY
	Knob only allows one item to be selected at a time.

static constexpr const FlagMask	SHOW_BUTTONS
	Show Add Layer/Delete Layer buttons.

static constexpr const FlagMask	CLOSED
	Stores the open/closed state of group knobs (group knobs).

static constexpr const FlagMask	TOOLBAR_GROUP
	Make the group into a viewer toolbar. General used via BeginToolbar (group knobs).

static constexpr const FlagMask	TOOLBAR_LEFT
	Defines which side of viewer toolbar appears on. Pick one at toolbar construction time (toolbar).

static constexpr const FlagMask	TOOLBAR_TOP
	Defines which side of viewer toolbar appears on. Pick one at toolbar construction time (toolbar).

static constexpr const FlagMask	TOOLBAR_BOTTOM
	Defines which side of viewer toolbar appears on. Pick one at toolbar construction time (toolbar).

static constexpr const FlagMask	TOOLBAR_RIGHT
	Defines which side of viewer toolbar appears on. Pick one at toolbar construction time (toolbar).

static constexpr const FlagMask	TOOLBAR_POSITION
	A mask for the position part of the flags.

static constexpr const FlagMask	NO_CHECKMARKS
	Disable individual channel checkbox widgets (channel/channelset knobs).

static constexpr const FlagMask	NO_ALPHA_PULLDOWN
	Disable 4th channel pulldown widget (channel/channelset knobs).

static constexpr const FlagMask	PROXY_DEFAULT
	Sets default knob value from script proxy format rather than full res (format knob).

static constexpr const FlagMask	COLORCHIP_PRESERVE_ALPHA
	The ColorChip_knob discards alpha values by default. Set this flag to make it keep them, instead.

static constexpr const FlagMask	ALLOW_NUKE_COLORSPACES
	Allows the knob to display Nuke's native colorspaces if Color Management is set to Nuke.

static int	nudgeController

static Knob &	showPanel
	passed to Op::knob_changed() when panel opened

static Knob &	hidePanel
	passed to Op::knob_changed() when panel closed

static Knob &	inputChange
	passed to Op::knob_changed() when inputs change

static bool	undo_state
	true in Op::knob_changed() when called due to undo/redo

static void(*	pMessageCallback )(const Knob *lpKnob, const OpMessage &lrMessage)
	Callback function for internal use.

Protected Types inherited from DD::Image::ValueStuffI
enum	{ W_SETVALUES_DBL, W_SETVALUE, W_SETRANGE, W_SETVALUESAT_DBL, W_SETVALUES_FLT, W_SETVALUES_INT, W_SETVALUES_INT64, W_SETANIMATION, W_SETVALUEAT, W_SETKEY, W_SETKEYAT, W_ISKEYAT, W_GETVALUE, W_SETEXPRESSION, W_SETVALUESAT_FLT, W_SETVALUESAT_INT, W_SETVALUESAT_INT64, W_GETVALUEAT, W_REMOVEKEY, W_REMOVEKEYAT, W_ISKEY, W_GETNUMKEYS, W_GETKEYINDEX, W_GETKEYTIME, W_GETDERIVATIVE, W_GETINTEGRAL, W_GETVALUEATVIEW, W_SET_ANIMATED, W_IS_ANIMATED, W_CLEAR_ANIMATED, W_TOGGLE, W_SET_INPUT, W_SETVALUEAT_VIEW, W_SPLIT_VIEW, W_UNSPLIT_VIEW, W_CLEAR_ANIMATED_VIEW, W_IS_ANIMATED_VIEW, W_SET_ANIMATED_VIEW, W_GETKEYFRAME, W_SETKEYFRAME, W_ADDKEYFRAME, W_GETEXPRESSION, W_GETINVERSE, W_GETINVERSE_GENERAL }

Detailed Description

This subclass of Knob can be used to manipulate a piece of data that changes over time, such as an animated shape. The Bezier operator uses this. There is also a demo Polygon plugin that you can refer to for an example of the use of this knob.

You must write code to store a set of "key" shapes. You should also store a "current" shape that may be different from any of the keys. You also need to write methods to set the current shape to an interpolation between two shapes, and to add and delete keys and to set a key to the current shape.

Member Enumeration Documentation

anonymous enum

Event numbers for pop-up menu

Constructor & Destructor Documentation

ShapeKnob::ShapeKnob	(	Knob_Closure *	cb,
		const char *	name,
		const char *	shapename = `"shape"`,
		const char *	label = `nullptr`
	)

This creates a child knob that holds the shape animation. The second argument is the name of this knob (and thus the name of the curve for the shape in the shape editor). The third argument is a label for the shape knob, if not given the shapename will be used.

References i.

Member Function Documentation

bool ShapeKnob::handle	(	int	event,
		double	frame
	)

protected

Do one of DELETE_KEY, MAYBE_SET_KEY, SET_KEY, ADD_KEY, NO_ANIMATIONS, AUTOKEY_ON, or AUTOKEY_OFF, depending on the event. This is useful to make a menu() that does these actions.

bool DD::Image::ShapeKnob::goto_shape	(	float	shape,
		const DD::Image::OutputContext &	context
	)

protectedpure virtual

Your subclass must implement this. It should set the "current" shape to an interpolation between two keys. Return true if the new current shape is different than the previous current shape.

Which keys and how much to interpolate them is determined by shape().

bool ShapeKnob::keys	(	int	n,
		float	delta = `1`
	)

protected

Change the number of keys stored in the shape curve and the value returned by keys(). You must reallocate your own storage of keys to match before calling this (it does not callback add_key() or delete_keys()).

If n is less than keys() then the trailing keys are deleted. If n is greater than keys() then delta is used as a spacing in time between each of them and between the first new one and the last old key. If no time has been set for any keys than delta is used as the time for the first one.

Usually you call this in from_script() to set the number of keys.

Returns true if n is different than keys().

bool DD::Image::ShapeKnob::set_key_at ( double t )

inlineprotected

Stores the current shape as a new key at given time. NYI...

bool DD::Image::ShapeKnob::maybe_set_key ( )

inlineprotected

void ShapeKnob::maybe_set_key()

When the user changes the current shape using the GUI you should call this. If is_animated() is off this will call set_key(0). If is_animated() is on and autokey() is on this calls set_key() (which will either set the current key or create a new one). If is_animated() is on but autokey() is off this does nothing.

This calls Knob::changed() so that Nuke knows that the display in the viewer must update.

bool DD::Image::ShapeKnob::no_animation ( )

inlineprotected

Make the node be non-animated by deleting all but one keys, setting the remaining key to the current shape, destroying the shape curve so it is not in the curve editor, and turning off autokey() and animated(). This pops up an "are you sure?" question if it looks like this will destroy useful animation.

int DD::Image::ShapeKnob::keys ( ) const

inline

Returns how many keys there are. This will be at least 1.

float ShapeKnob::time ( int key ) const

Return the time that key n is at. This can be used to draw frame numbers next to a "path" of a point in the GUI, or can be used to vary how the interpolation is done, for instance to make the motion smooth in time rather than in key numbers.

float ShapeKnob::shape ( double time ) const

Evaluate the shape curve at time. If the time is between two keys, this will return a number between those two key numbers. If there are less than 2 keys this always returns 0.

Return a number indicating which two keys to interpolate and how much to interpolate between them. This is set before goto_shape() is called.

If there are less than 2 keys this will always return 0.0.

If shape() is an integer (and in range) then the result should be exactly equal to some key. Otherwise do a mix between keys floorf(shape()) and ceilf(shape()), using (shape()-floorf(shape())) as a mixing factor.

The value may be out of the range from 0 to keys()-1. If this is true you should extrapolate the last two or first two keys. If that does not make sense for your data you should pretend it is equal to the first or the last key.

bool ShapeKnob::is_animated ( ) const

If this returns false then keys() is always 1, shape() is always zero, and any changes you make call set_key(0) no matter what the frame is. This is the initial state.

If this returns true than there is a shape curve that the user can edit in the curve editor. keys() is greater or equal to 1.

To turn it on, call set_key() (or call maybe_set_key() while autokey is on, or turn on autokey).

To turn it off call no_animation(). This will pop up a question for the user if Nuke thinks something valuable is going to be destroyed.

bool ShapeKnob::autokey ( ) const

inline

Return true if the autokey checkmark is turned on.

Sets autokey() to the given value, updating the checkmark in the user interface, and calling set_key() if you turn it on.

bool DD::Image::ShapeKnob::from_script ( const char * v )

pure virtual

You will need to implement this. It should figure out from the text how many keys there are and call keys() with that number, and allocate and store all the data.

The time of each key is done by the internal shape curve knob. In a normal script this will be parsed afterwards. If the shape curve has the wrong number of keys an error will be produced and it will be brute-forced to match.

Reimplemented from DD::Image::Knob.

void DD::Image::ShapeKnob::to_script	(	std::ostream &	o,
		const OutputContext *	,
		bool	quote
	)		const

pure virtual

You will need to implement this as well, to write all the data in each key in a way that can be parsed by from_script and the number of keys can be determined.

The easiest way is to put {...} around each key so that an outer ScriptList will return the number of keys.

Reimplemented from DD::Image::Knob.

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