App works this way:
User enters a starting location and a distance. User can choose to draw circles, or lines over the roads. Circles work fine. Lines used to work.
When Lines, the code finds the lat/long of the starting location, then for the points N, S, E, W of the origin at the distance set by the user (say, 100km). Starting with the N destination, the code calls google.maps.DirectionsService() to get directions from the origin to N. This returns an array of lat/longs in the the route.overview_path.
NOTE: I COULD use the directionsRenderer() to draw the route, BUT, the distance drawn would be greater than the distance set by the user. Drawing the entire route from the origin to the point N might be 124km over the roads, and I just want to draw 100km.
Instead, I step through the route.overview_path[] array, checking the distance between that point and the point of origin, adding each point to a new array. When the distance is greater than the dist set by the user, I stop, pop off the last element, then create a new Polyline based on this 2nd, smaller array.
I've spent the entire day in Chrome's developer mode walking through the javascript, setting breakpoints, watching locals, etc. The array of points passed in google.maps.Polyline({}) is a good array of unique points. I just cannot figure out why they aren't rendering.
Ultimately, the code used to draw 4 lines starting at the point of origin, one heading North, one heading East, South, West. etc....
The code is here: http://whosquick.com/RunViz.html
Thank you for your attention.
Nevermind. Solved it.
var objGeo = new LatLon(Geo.parseDMS(myroute.overview_path[0].Pa), Geo.parseDMS(myroute.overview_path[0].Qa));
I had inadvertently switched Pa with Qa.
Related
I'm just playing around with Here and this is my escenario for an idea.
Get a routing between 2 points, I know this is doable
Set the start and finish marker, I know this is doable
Get the distance between the 2 points, I know this is doable
Now, if the distance from point 1 and 2 is 3000 meters I want to set a marker ( You are here ) based on a arbitrary distance value, let say I want to add a marker at the 1750 meters point, the market should appears in the half route way.
Is this posible with the actual API?
Thanks in advance!
Yes it is possible to do with HERE javascript API.
Once you get routing response and create H.geo.LineString out of it, you can calculate distance between each two geo points from that line string using H.geo.Point#distance method. This will help to determine between which two points (lat, lng) is your desired arbitrary distance.
After that you need to calculate angle between these two geo points and use it in method H.geo.Point#walk in order to get exact position of the geo point you need.
Here you can find jsfiddle example which places marker on the simple LineString based on desired arbitrary distance.
I am running a taxicab distance function on a list of coordinates and I would like to convert the outcome integer to a mile or km quantity. For example:
0.0117420 = |40.721319 - 40.712278| + |-73.844311 - -73.841610|
Where 0.0117420 is the output I would like to convert to mi/km. How could I go about this?
This appears to be a situation where you are trying to navigate from (40.721319, -73.844311) to (40.712278, -73.841610) where these are lat / lon pairs, and you want to navigate using a "Manhattan" routing rather than a direct great circle route.
It looks like you are considering these points as opposite corners of a "rectangle" where travel is only allowed along north, south, east and west headings to move from one point to another and where travel along the path always brings the traveler closer to the destination point.
An approximation of this is to find one of the corners of the bounding rectangle for all such paths. There are two of them, one at (40.721319, -73.841610) and the other at (40.712278, -73.844311). So, you can pick one of these and chose that as a waypoint for approximating the length each possible "Manhattan routes" between the two points. If we chose the first, you will need to calculate the distance from the starting point to the waypoint then to the destination point. Such as:
l(0) = (40.721319, -73.844311)
l(1) = (40.721319, -73.841610)
l(2) = (40.712278, -73.841610)
Using the Haversine equations we see the distance from l(0) to l(1) is approximately 0.2276km and the distance from l(1) to l(2) is approximately 1.005km making the entire route about 1.2326km.
This is approximately the length of any "Manhattan route" you pick where the distance is strictly decreasing along the path taken between the two points. There are also some errors due to the curvature of the Earth, but for points this close to each other and so distant from either of the poles, this should be good enough for most applications.
I'm combining A* pathfinding with a steering AI so I can make the movement look more smooth and natural. To do this, I'm calculating the path from the enemy to the player and using checkpoints on the path to have the steering AI move to. However, from what I have seen the only way to get the x and y values of a certain point on a path, you need to use path_get_point_x(path, n) to get the x coord for the nth point of the path. But, from what I've seen, the amount of points in a path are far too low for me to accurately move the enemy around obstacles. Sometimes, the enemy goes through obstacles to get to the next point even though the path traces around the obstacle. I noticed there is a variable called path_position that is a number from 0-1 representing how far into the path you are (1 being finished). Is there a way to use that to predict where the player will be at position 0.3 of they're at position 0.25, for example?
Most of the time objects will take the quickest path, or path of least resistance. Check precise collision detection for tiles that are bordering the pathways and see if that helps keep objects out of collision objects. As for a prediction to where they will be you can multiple the speed of the object by the frames per second.
I have heading that i get with this computeHeading(from:LatLng, to:LatLng), latlng of one point and distance to second point(in meters) is there a way using these three things to get latlng of second point ?
From google docs Navigation Functions
Given a particular heading, an origin location, and the distance to travel (in meters), you can calculate the destination coordinates using computeOffset().
I am creating a 2D sprite game in Unity, which is a 3D game development environment.
I have constrained all translation of objects to the XY-plane and rotation to the Z-axis.
My problem is that the meshes that are used to detect collisions between objects must still be in 3D. I have the need to detect collisions between the player object (a capsule collider) and a sprite (that has its collision volume defined by a polygonal prism).
I am currently writing the level editor and I have the need to let the user define the collision area for any given tile. In the image below the user clicks the points P1, P2, P3, P4 in that order.
Obviously the points join up to form a quadrilateral. This is the collision area I want, however I must then convert that to a 3D mesh. Basically I need to generate an extrusion of the polygon, then assign the vertex winding and triangles etc. The vertex positions is not a problem to figure out as it is merely a translation of the polygon down the z-axis.
I am having trouble creating an algorithm for assigning the winding order of the vertices, especially since the mesh must consist only of triangles.
Obviously the structure I have illustrated is not important, the polygon may be any 2d shape and will always need to form a prism.
Does anyone know any methods for this?
Thank you all very much for your time.
A simple algorithm that comes to mind is something like this:
extrudedNormal = faceNormal.multiplyScale(sizeOfExtrusion);//multiply the face normal by the extrusion amt. = move along normal
for each(vertex in face){
vPrime = vertex.clone();//copy the position of each vertex to a new object to be modified later
vPrime.addSelf(extrudedNormal);//add translation in the direction of the normal, with the amt. used in the
}
So the idea is basic:
clone the face normal and move it in
the same direction by the amt. you
want to extrude by
clone the face vertices and move them
using the moved(extruded) normal
position
For a more complete, feature rich example, refer to the Procedural Modeling Unity samples. They include a nice Mesh extrusion sample too (see ExtrudedMeshTrail.js which uses MeshExtrusion.cs).
Goodluck!
To create the extruded walls:
For each vertex a (with coordinates ax, ay) in your polygon:
- call the next vertex 'b' (with coordinates bx, by)
- create the extruded rectangle corresponding to the line from 'a' to 'b':
- The rectangle has vertices (ax,ay,z0), (ax,ay,z1), (bx,by,z0), (bx,by,z1)
- This rectangle can be created from two triangles:
- (ax,ay,z0), (ax,ay,z1), (bx,by,z0) and (ax,ay,z1), (bx,by,z0), (bx,by,z1)
If you want to create a triangle strip instead, it's even simpler. For each vertex a, just add (ax,ay,z0) and (ax,ay,z1). Whichever vertex you processed first will also need to be processed again after looping over all other vertices.
To create the end-caps:
This step is probably unnecessary for collision purposes. But, one simple technique is here: http://www.siggraph.org/education/materials/HyperGraph/scanline/outprims/polygon1.htm
Each resulting triangle should be added at depth z0 and z1.