function data = updateConstantLine(obj,plotIndex)

%-AXIS INDEX-%

axIndex = obj.getAxisIndex(obj.State.Plot(plotIndex).AssociatedAxis);

%-PLOT DATA STRUCTURE- %

plotData = obj.State.Plot(plotIndex).Handle;

%-CHECK FOR MULTIPLE AXES-%

[xsource, ysource] = findSourceAxis(obj, axIndex);

data.xaxis = sprintf("x%d", xsource);

data.yaxis = sprintf("y%d", ysource);

data.type = "scatter";

data.visible = strcmp(get(plotData, 'Visible'), "on");

xaxis = obj.layout.(sprintf("xaxis%d", xsource));

yaxis = obj.layout.(sprintf("yaxis%d", ysource));

value = [get(plotData, 'Value') get(plotData, 'Value')];

if strcmp(get(plotData, 'InterceptAxis'), "y")

data.x = xaxis.range;

data.y = value;

else

data.x = value;

data.y = yaxis.range;

end

if ~isempty(get(plotData, 'Label'))

annotation = struct();

annotation.showarrow = false;

annotation.xref = sprintf("x%d", xsource);

annotation.yref = sprintf("y%d", ysource);

if strcmp(get(plotData, 'InterceptAxis'), "x")

annotation.textangle = -90;

end

annotation.xanchor = get(plotData, 'LabelHorizontalAlignment');

switch get(plotData, 'LabelVerticalAlignment')

case {"top", "cap"}

annotation.yanchor = "top";

case "middle"

annotation.yanchor = "middle";

case {"baseline","bottom"}

annotation.yanchor = "bottom";

end

annotation.text = parseString( ...

get(plotData, 'Label'), get(plotData, 'Interpreter'));

annotation.text = sprintf('<b>%s</b>', strjoin(cellstr(annotation.text), '<br>'));

if strcmp(get(plotData, 'InterceptAxis'), "x")

annotation.x = get(plotData, 'Value');

annotation.y = yaxis.range(2);

else

annotation.x = xaxis.range(2);

annotation.y = get(plotData, 'Value');

end

col = round(255*get(plotData, 'LabelColor'));

annotation.font.color = getStringColor(col);

annotation.font.family = matlab2plotlyfont(get(plotData, 'FontName'));

annotation.font.size = get(plotData, 'FontSize');

switch get(plotData, 'FontWeight')

case {"bold","demi"}

annotation.text = sprintf('<b>%s</b>', annotation.text);

otherwise

end

if strcmp(get(plotData, 'LabelHorizontalAlignment'), "center")

if strcmp(get(plotData, 'InterceptAxis'), "x")

tmpExtent = get(text(0,0,get(plotData, 'Label'), ...

"units", "normalized", "rotation", 90, ...

"Visible", "off"), 'Extent');

ylim = get(get(plotData, 'Parent'), 'YLim');

textWidth = tmpExtent(4);

textWidth = textWidth * (ylim(2) - ylim(1));

data.y(2) = data.y(2) - textWidth;

else

tmpExtent2 = get(text(0,0,get(plotData, 'Label'), ...

"units", "normalized", ...

"Visible", "off"), 'Extent');

xlim = get(get(plotData, 'Parent'), 'XLim');

textWidth = tmpExtent2(3);

textWidth = textWidth * (xlim(2) - xlim(1));

data.x(2) = data.x(2) - textWidth;

end

end

obj.layout.annotations{end+1} = annotation;

end

%-For 3D plots-%

obj.PlotOptions.is3d = false; % by default

if isprop(plotData, 'ZData')

numbset = unique(get(plotData, 'ZData'));

if any(get(plotData, 'ZData')) && length(numbset)>1

data.z = get(plotData, 'ZData');

data.type = "scatter3d";

%-flag to manage 3d plots-%

obj.PlotOptions.is3d = true;

end

end

data.name = get(plotData, 'DisplayName');

if ~strcmp(get(plotData, 'Type'), "constantline") ...

&& ~strcmpi(get(plotData, 'Marker'), "none") ...

&& ~strcmpi(get(plotData, 'LineStyle'), "none")

mode = "lines+markers";

elseif ~strcmp(get(plotData, 'Type'), "constantline") ...

&& ~strcmpi(get(plotData, 'Marker'), "none")

mode = "markers";

elseif ~strcmpi(get(plotData, 'LineStyle'), "none")

mode = "lines";

else

mode = "none";

end

data.mode = mode;

data.line = extractLineLine(plotData);

if ~strcmp(get(plotData, 'Type'), "constantline")

data.marker = extractLineMarker(plotData);

end

data.showlegend = getShowLegend(plotData);

end