I'm doing some simple plotting and would like to increase the usability of my figure.
I have quite a lot of points on my graph and have issues with selecting the ones I want because the click radius is so tiny.
I can increase the circle radius of my point but the radius of the area which displays a tooltip is still only 1 dot. Can I increase the radius somehow without having to create additional points around which respond the same?
Would it be even possible to increase the click detection radius without increasing the actual circle radius?
in the current version (0.8.2) and in the upcoming version (0.9) this is not yet a tunable parameter. It would be a good feature to expose a click radius, so I have made an issue on our issue tracker, that you can follow, here:
https://github.com/bokeh/bokeh/issues/2230
In the short term, a possible workaround is to have a second, invisible set of glyphs that are used for hit testing. They would be at the same locations, but bigger, to provide a bigger hit area.
Related
I'm using the GraphicsContext of a JavaFX Canvas to draw gradients (linear as well as radial), some times using the alpha channel to layer gradients on top of each other. But since the color resolution is so low (8 bits per channel), I have very obvious and annoying banding artifacts on each and every one of the gradients, for instance as shown in the image below.
I would like to increase the color resolution so that the banding disappears. If that is not possible, I would be eager to know if there are different Java-compatible APIs/frameworks for creating 2D drawings - I don't need UI stuff, I just want to draw, display, and save images.
Thanks in advance for any useful advice!
I'm working on a floor design app that allows the user to pick preset floor images and view them within a preset room image.
My problem is I'm struggling to get the perspective of the floor image to match the room image properly. I have played around with setting the height of the viewpoint and the tilt but is there a way to calculate what these should be by using the real world measurements of the floor and room image? My knowledge in perspective drawing is very limited so I apologise if I'm using the wrong terminology.
Any help or advice would be appreciated.
Thanks
You should try to find the vanishing point of the structural lines of the room. There are many line-finding algorithms for this.
You have to find two vanishing points, for the two main directions of the floor. On your example, one vanishing point is at the convergence of all red lines, the other one is far on the left side, at the convergence of he blue lines.
Once you have this, you can build a regular tiling starting from these two points:
To map a texture on the floor, you just have to find the bounding rectangle following the tiling:
to stretch your texture inside it:
and to remove extra parts and apply shadows:
I've created a simple triangular overlay using the Winforms GE API. As I'm zooming in and out parts or all of the overlay will disappear. The overlay is on the order of 80 miles in length.
The overlay is set to an altitude of 100 so I understand that when the overlay goes through a terrain feature it will disappear. My concern is when it is completely visible and I zoom in it disappears completely or in part. Since it is visible at a higher altitude shouldn't it also be visible at a lower altitude? (and I do realize that once I go 'below' the overlay it will disappear. This is not my problem.)
Any ideas or thoughts?
Actually, a ground overlay should stay on top of the terrain. So when the terrain is higher than '100' the overlay should be 'wrapped' over top of it. I am not sure about the overlay 'disappearing' at various heights (POV)
Recently, there was this question on SO - and the OP ended up saying they had contacted Google and the consensus was it was some sort of bug.......
I would like draw a filled polygon on iPhone with Google map (Version 1.1.1, the last one).
Anyone knows how to do like that on ios :
(My code on Android)
mMap.addPolygon(new PolygonOptions()
.addAll(latLngList)
.fillColor(Color.BLUE)
.strokeColor(Color.RED)
.strokeWidth(3));
Regards,
PS : If you have many solutions, keep in mind that I have many Polygon to draw.
The SDK currently doesn't support filled polygons, however there is a feature request to add them here:
https://code.google.com/p/gmaps-api-issues/issues/detail?id=5070
In the meantime, one option could be to draw your polygons into an image, and then add them as a ground overlay. This would be very limiting, but might work as a temporary workaround.
Another option is to add another view over the top of the map view and draw the polygons into it, and then update them whenever the map view moves. It isn't possible to perfectly synchronize another view with the map view, so your polygons will lag behind a bit as you pan/zoom around, but this might also be okay for you as a temporary workaround.
UPDATE
These are just some random ideas to try for the ground overlay approach, I'm not sure if they would work, but they might get you started:
I would suggest converting the lat/lon corners of the rectangle into MKMapPoint (using MKMapPointForCoordinate). These are equivalent to Google's coordinate system at zoom level 20.
You can then use the aspect ratio of the width/height of the rectangle in MKMapPoint coordinates to determine the aspect ratio of your ground overlay UIImage. Once you have the aspect ratio, you'll just need to experiment with actual sizes (ie guess a width, calculate the height from the aspect ratio) to find one which looks okay. The bigger it is, the finer the detail of your rectangle will be, but the more memory it will use, and probably the slower the performance will be. Also you might hit a hard limit at some size - I'm guessing the UIImage gets converted by the Google Maps SDK into a texture, and textures have a max size of 2048x2048 on iPhone 3GS+.
Then, use something similar to How to setRegion with google maps sdk for iOS? to calculate a zoom level and centre lat/lon. Instead of the map view width/height you would use your UIImage width/height, and you'd use the bounds of your rectangle instead of the bounds of the desired view. You also wouldn't need to calculate the scale from both the width and height (as the scale should be the same) - so just use one of them. Instead of creating a camera with the zoom level and centre lat/lon, set them on the GMSGroundOverlayOptions. Also set the ground overlay's anchor to the centre of the image (ie 0.5, 0.5).
The above describes how to add one GroundOverlay per rectangle. If you have lots of overlapping or nearby rectangles you could probably combine them into a single UIImage, but that would be a bit more complicated.
I'm currently working on a WYSISYG editor that allows the user to move, resize and rotate shapes by directly manipulating them. The resizing seems to be fairly complex when the shape is rotated. I got this working for non-rotated shapes, but it will take some trigonometric calculations to resize shapes that are rotated. The registration point is always is the middle of the rectangle because this makes rotating a lot easier.
Before I start implementing this, I was wondering if anyone knew of any libraries or sample source code that does this, or could share some tips and tricks to calculate the transformations.
I have the following parameters:
rotation (in degrees)
width, height
x, y
mouseX, mouseY
I attached a screenshot of what I'm trying to accomplish and another one that has some lines drawn onto it that should allow me to deduct the trigonometric calculations. The cross is the cursor.
alt text http://www.herrodius.com/images/resize.jpg
alt text http://www.herrodius.com/images/resize_lines.jpg
You might look at flex-object-handles, in particular the more recent version 2.
I recommend Transform Manager - http://www.greensock.com/transformmanageras3/
It's actually not that hard. Use the mouse coordinates (mouseX / mouseY)from the rotated display object and they will be transformed for you!