Develop Reference

Improve hovering over points to display tooltip

I am developing a datetime series line chart of efficiencies (in percentage) over time.
I need a tooltip to display information about each point on the chart, but I am finding that it is difficult to hover over points which coincide with the line or marker of another series.
The chart will be static in nature in that users will not be able to remove series from the chart - so they wouldn't be able to remove a series in order to be able to get more easily hover over the desired point.
In this demo - https://jsfiddle.net/slaws/37y4cteq/10/ - it takes many attempts moving the cursor in that area to get the tooltip for the last point in the series with the black markers to show.
Here
I moved my cursor around the area marked in red, but couldn't get the tooltip for any points other than one shown to display.
I had to follow a specific procedure and get my cursor to a specific point to be able to hover over the black marker and get the tooltip to display. Here
I had to hover over the second to last black marker and then move the cursor to the point indicated to get the tooltip for the last marker to display.
I have tried using the findNearestPointBy (x, y and xy) in combination with stickyTracking (true and false), with no improvement.
"stickyTracking": false,
"findNearestPointBy": 'y'
I read something about a direct hover mode rather than nearest neighbor but found no details about how to implement that.
Any guidance on how I can make it easier for my users to display the tooltips in my use case would be greatly appreciated!

Setting tooltip.snap as 0 and setting back stickyTracking to default options fixes your issue.
Demo: https://jsfiddle.net/BlackLabel/54q2eubd/
API: https://api.highcharts.com/highcharts/tooltip.snap

Paper.js Subraster Added Behind Rectangle Instead of in Front

In this Paper.js Sketch, selecting an area of the Mona Lisa raster makes a whiteout Rectangle of the area in place, as well as a generating a subraster of the area. The whiteout rectangle is added first, and the subraster second. However, as you witness in the sketch, the whiteout rectangle remains on top. Test this by commenting out the whiteout rectangle chunk and uncommenting the last line to see that the subraster does indeed get generated.
This can be remedied in this scenario with a call to bringToFront(), but that still doesn't explain why the subraster ends up behind the white rectangle, despite the fact that it was added last. What is the cause of this behavior? What is the logic going on here? Thanks in advance.

If you look at the getSubRaster() function, you can see that it inserts the returned raster directly above the raster object it was created from.
function() {
var rect = Rectangle.read(arguments),
raster = new Raster(Item.NO_INSERT);
raster.setImage(this.getSubCanvas(rect));
raster.translate(rect.getCenter().subtract(this.getSize().divide(2)));
raster._matrix.preConcatenate(this._matrix);
raster.insertAbove(this);
return raster;
}

Masked element in Snap SVG doesn't come into view when translated

I have a group of elements that are masked by a rect in SnapSVG and I want to translate the elements, bringing new ones into view (and hiding ones that are currently in view). The code is really simple - here's a codepen: http://codepen.io/austinclemens/pen/ZbpVmX
As you can see from the pen, box1, which starts outside the mask element (clip) should cross through it when animated, but it never appears. Moreover, box2, which should move out of the clipping area, remains visible.
This example seems to do a similar thing and has no problems: http://svg.dabbles.info/snaptut-masks2
Here's the code from codepen:
var t = Snap('#target')
var clip=t.rect(200,200,200,200).attr({fill:'#fff'})
var box1=t.rect(300,100,50,50).attr({fill:'#000'})
var box2=t.rect(300,300,50,50).attr({fill:'#000'})
var boxgroup=t.group(box1,box2)
boxgroup.attr({mask:clip})
boxgroup.animate({transform:'t100,300'},2000)
I notice that the svg.dabbles examples translates the clip region by 0,0 at one point, but adding something like that doesn't seem to get me anywhere.

Ok, I figured this out thanks in part to this really great article about SVG transforms: http://sarasoueidan.com/blog/svg-transformations/
The upshot is that when I translate the box group, it takes the mask with it. This is a little confusing to me still - I guess the mask attribute is causing this somehow? Anyways, the solution is to apply an opposite translation to the mask to keep it in place. Check the pen to see it in action but basically I just had to add:
clip.animate({transform:'t-100,-300'},2000)
The tricky part of this is that you now need to synchronize the movement of the mask and the movement of the box group.
edit - I now demonstrate how synchronization can be achieved using snap's set.animate method on the codepen.

Click on a Canvas - Get a list of options depending where clicked

I am not sure how to do this. Can it be done? How can it be done eligently? And hopefully can it be done without the need for another plugin library (jquery is ok) - I am trying to cut down the number of js files.
I have a canvas with a map in it. The user can click on the map. Then I want a white square to appear near to where the user clicked (rounded corners and a black border) with a few options on it for the user to select one. These can be text options, eg 'Country Summary', 'GDP', etc. Then the user selects one and the info appears in a area to the left, and the white option square automatically disappears.
Is this possible? Can it be done without the need for a window with a blue bar at the top and all the other window baggage?
Hope someone can help.
Jon

Yes, it can be done. You don't have to do it in the canvas, you can use regular HTML for that part.
Just add a new element to the page with the following CSS properties
position:absolute;
display:inline;
(as well as some CSS for rounded corners and black borders)
and then set its X and Y properties to the X and Y mouse coordinates of the event.
Then work with that element as you would with anything else.

Spot the ball game, zooming problems, jQuery

I am trying to create a spot the ball game, so it will (eventually) be an image of a player kicking a ball but the ball has been removed and the player needs to click where the ball should be.
The first version went well and works.
http://enjoythespace.com/sites/game/test.html
But what I need to add is some sort of zooming so you can see more accurately where you are clicking. I been playing around and have come up with this
http://enjoythespace.com/sites/v2/demo.html
But once you click it looks great when zoomed in but when you go back to the image its way off.
I think its todo with how the image is setup, the #webpage is half the original size of the image and the #retina uses the full size of the image.
Any help?

The first problem is that you aren't setting the retina backgroundPosition correctly.
This code works (I added a zoom variable to make it clear how changing the zoom would change the calculation, but it would need other changes too):
/* Moving the retina div with the mouse
(and scrolling the background) */
zoom = 2.0;
retina.css({
left : left - sizes.retina.width/2,
top : top - sizes.retina.height/2,
backgroundPosition : ""+(-zoom*left+sizes.retina.width/2)+'px '+(-zoom*top+sizes.retina.height/2)+'px'
});
Test this by checking that all four corners are seen correctly in the retina, i.e. when you're over the corner of the main image, the corner should be in the center of the retina circle.
The second problem is if you resize the browser the position calculations are out because the offset variable isn't updated for the new size. A simple way to do this is to put this as the first line of webpage.mousemove() so the offsets are updated every time:
var offset = { left: webpage.offset().left, top: webpage.offset().top };

It looks like you are passing the top/left position click point of the zoomed image to highlight where you have clicked. What you will need to do is alter your top/left position based on whether the fisheye is over the image or not.
Does the un-zoomed image have to be part of the news page or can it be a standalone image?
If it can be standalone then the solution should be quite simple. If the zoomed in image is twice the size of the unzoomed one then you can just set the top/left values of the highlight to half the value of the zoomed, when looking at the unzoomed.
Jquery position will allow you to accurately get the position.
jQuery Position()