Is it possible to add a marker where spike lines touch axis, like shown in chart below, in Dash Plotly? - plotly-dash

Is it possible to add a marker where spike lines touch axis, like shown in chart example, in Dash Plotly?

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Specific X-Value labels for SSRS scatter plot

I am trying to reproduce this graph
I am having issues setting the x-axis to be the values 1,8,30,50,100,150,200.
I also have no idea how I can get the secondary y-axis to have labels at the defined x-axis.
I took the SQL and created another column called CallOutPoints which just did a simple IIF(X NOT IN (1,8,30,50,100,150,200) then NULL. I then added this but I still can't get the x-axis or y-axis intervals/labels to match what I am after.
My attempt you can see the blue markers which are my calloutpoints, I just want the x-axis to only show ticks at each non-null calloutpoints value and the secondary-y axis to have tickmarks at every non-null calloutpoint.
FRACTION = Red markers
CallOutPoints = Blue Markers

Horizontal Axis Properties

In my chart, Incomprehensible what value of Y axis belong to X axis, what the best way to present the chart clearly. Attached Image.
Have you considered using StripLines?
Taken from this MSDN article
To show vertical strip lines, right-click the horizontal chart axis and click Horizontal Axis Properties.
Select the Use interlacing option. Grey strip lines will appear on your chart.
Applying this to a chart will then alternate the colour for each category on the X axis, such as this. This will make it clearer which columns belong to which X axis category.
Update
For use with a 3D Clustered column chart you will need to set up the Striplines in a more complicated way.
Select your X axis and find StripLines in the properties. Hit the '...' to open a new window.
Add a New Member and set it up as shown in the below image. This is effectively saying show a line for every second number, and offset the stripline by 0.5 of a category.
In my example I have set the BackgroundColour to MidnightBlue also, which gives an output similar to
With this alternating background it should make it clearer for your users to see which columns belong to which category.
Let me know if you need further assistance with this.

google maps api marker composed of image and line

Is it possible with "Google Maps Api" to obtain a marker composed of a line and ends with a picture?
I tried to use a marker consists of a single image (eg, line and circle) and if there are 2 adjacent markers will be covered from the first second.
For example I have marker like this:
--0
and the second it's close the result is:
--0-0
I must rotate so the result is:
--0
\
0
how I can make this?
Take a look to MarkerOptions the attribute anchorPoint.
Using the Marker position you can detect a possible overlap between images, and change that value and image to do what you need.

How to plot markers animating from center?

I want to show markers coming out from map center(cluster's position) to their respective latlong.
e.g. redfin.com
Marker animations like DROP and BOUNCE wont be useful here I suppose.
is there any way to acheive it?

Moving shape within the polygon

Test link: http://bit.ly/Runmah
pick one item from left side for testing.
it's rotating when he find two intersect points on the line.
i want to move red rectangle within the polygon. It shouldn't go outside of polygon.
My code is: http://pastebin.com/pRMpk81f
Edit 1: http://pastebin.com/C3j4WSC1
If you know how to find the intersection of points on the line then you should be able to find distance between wall and furniture (line and edge of rectangle), you can check this value and for example stop draging and snap,
EDIT1:
when dragged item is selected (mouse is down) than you constantly check distance (e.g. on mouse move), then you can decide that if distance is within some threshold you will stop movement (basicaly you will set calculated position- snap - instead of applying mouse position) otherwise you will follow mouse.
EDIT2:
also you can test if the point is inside the shape by calculating intersection points - even number the point is outside, odd number - the point is inside
best regards