This is probably a simple question but I have not been able to figure it out.
I want to be able to implement implement a hierarchical processing of mouse events. For instance, I would like to be able to press on the middle mouse button and then and only then rotate the camera around its position.
Can anyone indicate how to achieve this or point towards some example?
Related
My goal is to implement a method, that tracks persons in a single camera. For that, I'm using Scaled Yolov4 to detect persons in the scene, then I generate points inside of their bounding boxes using cv2.goodFeaturesToTrack, and track them using Lucas-Kanade Optical Flow cv2.calcOpticalFlowPyrLK.
the problem is, sometimes the points make huge jumps, and I can't tell why. The following video shows the problem I'm facing, specifically, on second 0:02, the green dots jumps in a weird manner which makes my method detects that person as a new person.
https://www.veed.io/view/37f98715-40c5-4c07-aa97-8c2242d7806c?sharingWidget=true
my question is, is it a limitation on LK optical flow, or I'm doing something wrong? And is there a recommended Optical Flow method for tracking, or an example implementation for Single Camera Multi Person Tracking using Optical Flow? because I couldn't find much literature or codes about it.
I have 3 KML's that do not draw at all and 2-3 that act sporadically depending on what zoom level they are at. I checked the file limitations and I don't seem to be violating any of the limits. I went back to my original shapefiles to check for geometry errors. One of the files had geometry errors and I fixed them yet it didn't seem to fix the problem of the KML not rendering. I've also implemented zoom functionality with Googles Visualization API and geoxml3 processor. Here are some interesting things that happen with my application:
One of the KML files that does not draw will actually respond to the
zoom functionality by zooming to its extent but still won't draw the
polygon; evidence that the KML is being parsed but not drawing.
One of the KML files that does not draw will eventually draw if I
click on the polygon next to it and am zoomed in close enough. It
will not initially.
I have two KML files that draw when zoomed out but 'disappear' when
I zoom in.
My application is here and my fusion table is here. If anyone has had similar problems and was able to fix them I would really appreciate to know how it was accomplished because I'm stumped at this point.
Thanks
first of all: Fusion Tables are still experimental
some issues:
South Nelson Elementary is missing in varID
JV Humphries Secondary Polygons needs to be fixed
I thought I would post an update.
It turns out some of my data did have geometry errors; those were fixed and converted to KML.
The problem is my actual coding. The code was orginally written to simply display polygons from an array and to be turned on/off via a checkbox. The reason for this was to be able to view adjacent boundaries of the other polygons. I achieved this in my initial coding and the user had to zoom into the area of interest via Google's map functionality.
Then I was asked to have a zoom function when the checkbox was clicked to have the application zoom to the polygon in question. This of course works but it depends on which order the checkboxes are clicked on. I'm fairly certain it has to do with how the empty array is populated as checkboxes are clicked on/off.
I don't fully understand the logic of how the code decides which polygon to zoom or not zoom to. All I know is that if all checkboxes are unchecked then each checkbox is checked on/off one at a time the zoom functionality works.
If anyone has a suggestion on how to have each checkbox act 'independently' to zoom regardless of order clicked I would appreciate it.
Firstly,I use google static map API to get the image to display on html/wml.
And then, I want to get the point's GPS position where user pressed on the image.
Is there some way to get the GPS position if I got the co-ordinates on the image?
The short answer is probably not. You can't be sure exactly what the static map's dimensions are (the server might change the location slightly to fit things better, etc.). If you're just asking for a map by center and zoom then you stand a slightly better chance, but it will still be tricky.
If you're trying to add dynamic behaviour to a static map, have you considered instead the Maps JavaScript API? Finding the coordinates of where a user clicks is trivial there. (Also, you can disable the zooming, panning, controls, etc. if you want so that it still feels like it's static).
Apologies if there is a thread for this already, I couldn't find one that I could get my teeth into.
Anyway, I'm new to WPF and want to create a custom control that will be a sort of graphic control. The graphic will always consist of a circle, containing a matrix of several squares (from several hundred to several thousand actually) The squares need to respond to mouse click and mouse over events (and ideally be possible to navigate/select via keyboard.) Each square will represent an object I've coded.
In the past I've used a grid control to display the coloured squares (with VCL in CBuilder) but I would like to make a graphical version. (Actually, another question I'd like to ask is, is there a WPF grid control where I can set the colours of individual cells?)
The question is, where to start? Do I start with a canvas and draw on it? Do I derive from an existing object? I'm just a little lacking on ideas on implementation so any pointers or advice you can offer will be greatly received.
BBz
First off I would suggest getting a decent handle on WPF and how it approaches the problem set. It is vastly different from previous .NET Desktop technologies such as WinForms. Once you have a decent understanding in regards to the separation of logic from UI and how WPF approaches the problem then you can dive in and begin making the right decisions based upon what you encounter.
The problem you mention can be solved in multiple ways. In regards to your question about making use of a Grid, that could be done as that is a layout type. It is vastly superior to the Canvas in terms of arranging your visual structure. The defined rows/columns are nothing more then containers which can hold varying UI objects. Therefore pushing a Rectangle into the Grid and coloring as desired would give you the effect you are looking for. This Rectangle could then become a custom control which would allow you to define varying properties on, as well as specific triggers for mouse overs, etc...
At a higher level you will want to encapsulate this logic as a UserControl which will also hold your custom control. Perhaps the UserControl contains the Grid which will make use of your custom control.
Hopefully this gives you some ideas around how to get started, however getting a better understanding of WPF will help you immensely in achieving your goal.
I work for a ticketing agency and we print out tickets on our own ticket printer. I have been straight coding the ticket designs and storing the templates in a database. If we need a new field adding to a ticket I manually add it and use the arcane co-ordinate system to estimate where the fields should go and how much the other fields need to move by to accomodate new info.
We always planned to make this system automate with a simple (I stress the word simple) graphical editor. Basically we don't forsee tickets changing radically in shape any time soon, we have one size of ticket and the ticket printer firmware is super simple because it's more of an industrial machine, it has about 10 fonts and some really basic sizing interactions.
I need to make this editor display a rectangle of the dimensions by pixel of the tickets (can even be actual size) and have a resizable grid which can toggle between superimposition and invisibility on top of the ticket rectangle and represented by dots rather than lines.
Then I want to be able to represent fields by drawing rectangles filled with the letter "x" that show the maximum size of the field (to prevent overlaps). These fields should be selectable, draggable and droppable in a snap to grid fashion.
I've worked out the maths of it but I have no idea how to draw rectangles and then draw grids in layers and then put further rectangles full of 'x'es on top of those. I also don't really know much about changing drawn positions in accordance with mouse events. It's simply not something I've ever had to do.
All the tutorials I've seen so far presume that you already know a lot about using the draw objects and are seeking to extend a basic knowledge of these things. I just need pointing in the direction of a good tutorial in manipulating floating objects in a picturebox in the first place.
Any ideas?
For those of you in need of a guide to this unusual (at least those of us with a BIS background) field I would heartily endorse:
https://web.archive.org/web/20141230145656/http://bobpowell.net/faqmain.aspx
I am now happily drawing graphical interfaces and getting them to respond to control inputs with not too much hassle.