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MyCursor.m
e10c22efd725TekRSA-Freq-vs-Time

MyCursor.m
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			classdef MyCursor < handle

			properties (GetAccess = public, SetAccess = protected)
			Axes % Axes in which the cursor is plotted
			Line % Line object that represents the cursor
			end

			properties (Access = protected)
			Figure % Figure that contains Axes

			% Variables for the temporary storage of information during
			% processing the interaction callbacks
			originalWbmFcn
			originalWbuFcn
			originalWbdFcn
			originalXLimMode
			originalYLimMode

			was_dragged = false

			% Minimum interval between the subsequent updatings of the cursor
			% position when it is dragged (s)
			DragDelay

			% Time of the previous drag
			TlastDrag
			end

			properties (Dependent = true)

			% User-friendly ways to refer to the properties of Line
			orientation % vertical/horizontal
			value % cursor position
			end

			methods (Access = public)
			function this = MyCursor(Axes, varargin)
			p = inputParser();
			p.KeepUnmatched = true;
			addRequired(p, 'Axes', @isaxes);
			addParameter(p, 'position', []);
			addParameter(p, 'orientation', 'vertical', @ischar);
			parse(p, Axes, varargin{:});

			% All the unmatched parameters are assumed to be line
			% parameters and will be passed to the line constructor
			line_nv = struct2namevalue(p.Unmatched);

			this.Axes = Axes;
			this.Figure = Axes.Parent;

			this.DragDelay = milliseconds(100);

			% Draw the cursor line
			if strcmpi(p.Results.orientation, 'vertical')
			if ~isempty(p.Results.position)
			pos = p.Results.position;
			else
			pos = (this.Axes.XLim(1)+this.Axes.XLim(2))/2;
			end

			this.Line = xline(Axes, pos, line_nv{:});
			else
			if ~isempty(p.Results.position)
			pos = p.Results.position;
			else
			pos = (this.Axes.YLim(1)+this.Axes.YLim(2))/2;
			end

			this.Line = yline(Axes, pos, line_nv{:});
			end

			% Configure the line
			this.Line.ButtonDownFcn = @this.cursorButtonDownFcn;

			% Do not display cursors in legends
			this.Line.Annotation.LegendInformation.IconDisplayStyle='off';
			end

			function delete(this)
			delete(this.Line);
			end
			end

			methods (Access = protected)

			% Callback invoked when the cursor is clicked by mouse
			function cursorButtonDownFcn(this, ~, ~)

			% Freeze the limits of axes
			this.originalXLimMode = this.Axes.XLimMode;
			this.originalYLimMode = this.Axes.YLimMode;

			this.Axes.XLimMode = 'manual';
			this.Axes.YLimMode = 'manual';

			% Replace figure callbacks
			this.originalWbmFcn = this.Figure.WindowButtonMotionFcn;
			this.originalWbuFcn = this.Figure.WindowButtonUpFcn;
			this.originalWbdFcn = this.Figure.WindowButtonDownFcn;

			this.Figure.WindowButtonMotionFcn = @this.localWbmFcn;
			this.Figure.WindowButtonUpFcn = @this.localWbuFcn;
			this.Figure.WindowButtonDownFcn = @this.localWbdFcn;

			this.Line.Selected = 'on';

			this.TlastDrag = datetime('now');
			end

			% Replacement callback that is active when the cursor is being
			% dragged
			function localWbmFcn(this, ~, ~)
			this.was_dragged = true;

			Tnow = datetime('now');

			if (Tnow-this.TlastDrag) > this.DragDelay
			moveLineToMouseTip(this);
			this.TlastDrag = Tnow;
			end
			end

			% Replacement callback that is active when the cursor is being
			% dragged
			function localWbuFcn(this, ~, ~)
			if this.was_dragged

			% If the cursor was dragged while the mouse button was
			% down, finish the interaction
			this.was_dragged = false;
			restoreAxes(this);
			else

			% If it was not dragged, disable the mouse motion callback
			% and wait for a new mouse click to move the cursor
			this.Figure.WindowButtonMotionFcn = this.originalWbmFcn;
			end
			end

			% Replacement callback that is active when the cursor is being
			% dragged
			function localWbdFcn(this, ~, ~)
			moveLineToMouseTip(this);
			restoreAxes(this);
			end

			function moveLineToMouseTip(this)

			% Move the cursor line to the current position of the mouse
			% tip withing the plot area.
			switch this.Line.InterceptAxis
			case 'x'
			new_x = this.Axes.CurrentPoint(1,1);
			new_x = min(new_x, this.Axes.XLim(2));
			new_x = max(new_x, this.Axes.XLim(1));

			if new_x ~= this.Line.Value
			this.Line.Value = new_x;
			end
			case 'y'
			new_y = this.Axes.CurrentPoint(1,2);
			new_y = min(new_y, this.Axes.YLim(2));
			new_y = max(new_y, this.Axes.YLim(1));

			if new_y ~= this.Line.Value
			this.Line.Value = new_y;
			end
			end
			end

			% Restore the axes in the state before user interaction
			function restoreAxes(this)

			% Restore the original figure callbacks when the cursor drag is
			% finished
			this.Figure.WindowButtonMotionFcn = this.originalWbmFcn;
			this.Figure.WindowButtonUpFcn = this.originalWbuFcn;
			this.Figure.WindowButtonDownFcn = this.originalWbdFcn;

			% Restore the axes limits mode
			this.Axes.XLimMode = this.originalXLimMode;
			this.Axes.YLimMode = this.originalYLimMode;

			this.Line.Selected = 'off';
			end
			end

			methods
			function val = get.orientation(this)
			try
			switch this.Line.InterceptAxis
			case 'x'
			val = 'vertical';
			case 'y'
			val = 'horizontal';
			otherwise
			val = '';
			end
			catch
			val = '';
			end
			end

			function val = get.value(this)
			try
			val = this.Line.Value;
			catch
			val = NaN;
			end
			end

			function set.value(this, val)
			this.Line.Value = val;
			end
			end
			end

rINSTCONTROL/@MyCursor/MyCursor.me10c22efd725TekRSA-Freq-vs-Time

MyCursor.mView Options

rINSTCONTROL/@MyCursor/MyCursor.m
e10c22efd725TekRSA-Freq-vs-Time

MyCursor.m
View Options