I am a beginner and trying to make several Vertex shown on the TigerGraph Insights Map Widget.
The Map widget displays vertex attributes as latitude and longitude, and I have shown the Location Vertex on the Map Widget successfully.
But the other Vertex cannot be shown on Map Widget due to no latitude and longitude data.
I have large CSV file of latitude and longitude for the “Location Vertex” and want to use GSQL to traverse these geolocation attributes to another Vertex, finally these Vertexes could be displayed on the map widget.
For example, my Vertex relations are shown in the pic.
Vertex & Edge
I want to find out whether there is a way to display the result of a GSQL that we would create in order to query the graph and associate dynamically the longitude and latitude data from a location to the corresponding action Vertex.
How can I use GSQL to associate these geolocation attributes from “Location Vertex” to “Action Vertex”?
Related
Currently creating a gltf importer/exporter.
How are the inversebindmatrices calculated exactly? I need that info to modulate them in order to change some bone positions in my model.
Thanks
An inverseBindMatrix for a joint in glTF is the inverse of a 4x4 matrix describing the transform from glTF root model space to that particular joint's rest location. The rest location is where the joint naturally lies when in the "bind pose" when the joint is first bound to the unaltered raw mesh.
At runtime, a client application will need to quickly calculate the delta between a joint's current transformation and the same joint's original "bind pose" transformation. That difference is what will be applied to the vertex position in the skinning shader. Doing so involves multiplying both the current joint transform and the inverse of the bind transform by the vertex position. This causes the vertex position to move from its original raw location to a new location, based on the difference between the two transforms.
If a joint's rest / bind position is updated, store the inverse of that new transform as the inverseBindMatrix for that joint.
For more details, see the glTF Skinning Tutorial.
I have an SVG map (called "external map" hereafter) representing a portion of the globe ; along with a map of the globe ("background map") in its entirety. I would like to be able to detect what projection the external map uses (my final aim being to superimpose the two maps). For the moment I only consider the Mercator, equirectangular and orthographic projections.
I developed a code that shows the two maps (external on the left, background on the right) and allows the user to drag/zoom on the background map and choose one of these projections (link). If I manually fiddle with these properties I conclude that the external map was probably created using the Mercator projection ; but how could I have found this result programmatically ? I thought about the following algorithm :
Ask the user to choose, say, 5 points that he would geolocalize on both maps.
Calculate the (pixel-based) distances between each of the 5 points on the external map.
For each projection :
Center and scale the background map using the coordinates of the 5 points that the user located on the background map.
Calculate the pixel-based distances between the 5 points on the background map. Compare them with the distances calculated on step 2. The projection with the smallest distance differences is then considered to be the one that was used to create the external map.
This algorithm raises several questions :
On step 3, how can I calculate the center of the map using the located points ? The projections are often distorted, so using proportionality to find it doesn't seem right.
For the same reasons, I don't know how I could determine the scale (zoom) to apply on the background map.
This algorithm seems quite natural but the issues I raise make it look impossible to implement. Are there other (better) algorithms that could help me determine this projection ? If I can find it manually there must be a way to find it programmatically !
I use d3 for the map rendering if it helps.
I'm creating a navigation app and want the map to show the users location at the bottom of the map, like in Maps app when routing/navigating. However you can only determine which coordinate to focus on by using the centre coordinate.
Therefore I need to calculate an offset distance and bearing and calculate a coordinate that this represents the central coordinate that will allow the displaying of the users location at the bottom of the map.
This is all complicated by the 3D view where the camera pitch and altitude affects the relationship of distance between the offset coordinate and the users location.
Is there an easier way to do this or does someone know how to calculate this?
Thanks (a lot!)
D
I intend to draw maps using d3.js and geoJson.
I need to plot circles on this map.These circles when hovered should get bigger and display some data inside that.
Also,i need to create a time line scale which will increase and decrease the circles in the map based on the data for that particular time frame.
I am able to draw map with the help of geo JSON file but the problem is how to plot the circles such that when map is moved in the canvass the circle remains at same position inside the map.I mean the circles should be relative to map not relative to canvass.
Secondly I am not able to understand how the coordinate system of maps work.
Any help Please..
In my windows phone app I have a map object which points to the position longitude and latitude. I track the position changed event for every few meters threshold value. It works fine and shows the data correctly on map with puhpins when I am moving from point A to point B.
But when I am moving from point B to point A, it shows the map in the same direction as earlier which is A to B with pushpin values moving from B to A.
I want to change this behavior that is when a person is moving from point B to A the B point should face the person holding the mobile and pushpins should move towards A i.e. away from the person who is holding the phone.. currently I rotate my mobile 180 degress to see the pushpins are pointing towards A from B.
Bing Maps doesn't support rotating PushPins or perspective on WP7/WP8. You can only rotate the full Bing Maps control. Which causes a lot of problems if you have unidirectional items (such as text) as they'll show up rotated alongside with the map.
If you're on WP8, you can use the new Nokia Map control and set the Pitch & Heading properties to rotate the map for turn-by-turn navigation. See examples of setting Pitch, Heading and other properties at this Nokia article # http://www.developer.nokia.com/Resources/Library/Lumia/#!maps-tutorial.html;#toc_Mapproperties
For example, here's the WP8 Map control with Heading=0:
And here is the same place rotated with all the text and items appearing as they should with Heading=180.
And here's the Map control after setting the Pitch property.
The reason Bing Maps can't do rotations and Pitch correctly is because it has Bitmap tiles. Which means the data it gets from the server is an bunch of images it lays out in a grid. The reason Nokia Maps can do rotations and pitch correctly is because it uses vector tiles. It gets data from the server about what's in each location and the map control itself draws the topographic layout.
This code worked for me- http://j2i.net/blogEngine/post/2010/12/15/Calculating-Distance-from-GPS-Coordinates.aspx
You should save the last coordinate (or get the next one you are heading to) and compare them using the Bearing method, then set
myMap.Heading property to the received value.