I have a globe, similar to http://mrdoob.github.com/three.js/examples/webgl_trackballcamera_earth.html.
My globe has some spots on different locations (f.ex. Paris, Rome or London). Whenever one of these spots come into view, a popup window with additional information to that location should popup appear, and again disappears when that spot rotates out of view, quite similar to http://workshop.chromeexperiments.com/cloudglobe/.
You need 3D coordinates of those points and you need to transform(rotate or whatever) them with globe. Then use this code http://www.opengl.org/wiki/GluProject_and_gluUnProject_code to get screen space coordinates of those points. After that it is simple question of HTML, CSS and some javascript. You know where they are on screen so, for example, you can put some absolute positioned divs with text. But you will need to check on which side of globe those spots are - use rotation phase of the sphere or z-coordinate of the point or simple do color-based picking to see if this spot is visible.
Related
Using SceneKit
I want to make the gray transparent box to disappear and only show the colored boxes when the user zooms in.
So I want to detect when that box's edges are starting to fall off the screen as I zoom, so I can hide the gray box accordingly.
First thoughts, but there may be better solutions:
You could do an unprojectPoint on the node and check against screen coordinates, do the +/- math on object size and skip Z. I "think" that would work
You can do some physics based collision detection against an invisible box or plane geometries that acts as your screen edges, has some complexity if your view is changing, but testing would be easy - just leave visible until you get what you want, then isVisible=false
isNode(insideFrustomof: ) - returns boolean on whether it "might" be visible. I'm assuming "might" means obscured by other geometry which in your case, shouldn't matter (edit) on second thought, that doesn't solve your problem but I'll leave it in here for reference.
I am currently building a game on swift, using Storyboards. The game revolves around generating income from fishing lobsters. Users have lobster pots, which they can place into either inshore or outshone regions of the water. With no prior experience. I have minimal knowledge on how to code in swift.
My problem at the moment is understanding collision detection. There are three regions of the screen where the users can drag their pots into. The first screen is the starting position of the lobster pots, from which the player must drag the pots into either inshore or offshore locations. Currently, I have managed to code the action of dragging and dropping the pots, so they can be placed into any point on the screen. What I hope to do is to be able to have the pots to snap into position when the pots are dropped within the regions of either the inshore of offshore boxes. Furthermore, when the pots are dropped into place, I would like them to be organized in a row, equally spaced, and dropping into a row below, filling up the box.
Image -
I think I should also mention that the background is an image view, taken as a screenshot of the view when the game is running. I did this to avoid layering, as some pots would sometimes move behind the boxes when dragging them.
Thanks in advance.
Here some ideas:
You already have the code to move the tiles, that's good. All you now need is same math.
Although your background is an image, you also need some data model to keep, where your stuff is (or where your pots belong to). It is important to know, if a pot is in "My Pots" or "Inshor" or "Outshore". This information has to keep in some objects, like "myPots" and "inshore" and so on.
So dragging doesn't only move the pots on screen, it also changes where a pot belong to.
Hint: A representation of a area (myPots, ...) can be done with invisible areas. Invisible, because you already have the background. But a invisible rectangle gives you the ability to resize the ui without complicated re-calculations.
I would devide the area like this:
The coordinates are just examples for better understanding.
Most game engines work with coordinate (0,0) at top left.
So if you drag and release a pot, you have to calculate the end point of drag and compare it with your areas. No complicated collision detection necessary, because you only test if a point is in an area. But if you want collision detection, search for AABB collision detection (like here https://studiofreya.com/3d-math-and-physics/simple-aabb-vs-aabb-collision-detection/).
In your case it would be enough to have the decision:
if draggedPot.endCoordinate.y > 100 {
// in or out shore
if draggedPot.endCoordinate.x > 300 {
// outshore
}
else {
// inshore
}
}
else {
// still in myPots
}
I hope you get the idea :)
For arrange in a row it's also some math. Loop over the pots in an area, place one by one, always start-x + width-of-pot + some space. If this is greater than width of the area, set y to height of pot + some space and x starts at zero.
In this example how to fix popup position when I zoom ?
Popup example
The popup (an ol.Overlay) is already fixed to a given coordinate, the one you click. When zoomed, the visual distance between the popup and the marker changes but they are still at their given coordinates.
If you don't want two objects to move apart when zoomed in, make sure that they are positioned on the same coordinates.
You can set the clicked features coordinates as the overlay coordinates, and still show it X number of pixels above the point by using the offset option on the overlay.
I’d like to use a Shapefile to generate an interactive world map. I was able to import the data and use CG Paths to draw the map into one large view.
The map needs to support panning, zooming and touch interaction. For that, I've created a UIScrollView and placed the MapView (large view with all of the countries drawn) into it.
I need to improve two aspects of it:
Performance / rendering
I have drawn the map much larger than the screen size, in order to make it look reasonable when I zoom in. There are a few problems with this. First, when I'm zoomed out, I need the border stroke/line to be wider so they are visible. When I zoom in, I'd like the stroke to be a thinner. Also, when I zoom in, I can still see that the map is a blurry. I don't want to increase the view size too much.
How can I make the map look crisp when I'm zoomed in? I attempted to redraw the map on zoom in, but it takes far too long. Can I somehow only re render onscreen stuff?
Touch Interaction
I need to be able to have a touch event for every different country.
Possible approach?
I was thinking of trying to separate every country onto it’s own view. That should make touches easy to handle. Then I’m thinking I can possibly redraw the appropriate views that are on screen/zoomed to.
I've played with an app that does something similar ("World Maps"), and I can see that when you pan or zoom, the map is blurry for a second but then becomes clear. What is going on there?
use mapkit and provide custom tiles. dont reinvent the wheel and try to write yet another map framework
I think that you have to create different scaled area image from the big map image. how to say... imagine the google map, how it works... I think that provide many different zoom factor image for every area of the world... then merged display on the screen while user need show it ...
use code implemented the map effect is impossible on current iPhone device, out of the ability of the iOS device
I'm looking for a way to overlay the iOS maps with a grid. The complete earth needs to be divided into squares. The location of the user doesn't effect the placement of the squares (In other words; the squares are always placed the same. On every iPhone, no matter where the user is).
I Looked into MKOverlay, but I've never used this so it's very new to me. Also, when zooming in/out should effect the overlay. It's very important that the squares are always covering the same area on the map (For example; A square should be 100mx100m in real world, when you zoom out, the square should cover the same 100x100).
Is there anybody that can point me in the right direction?
Is it possible to draw the grid from een .xml? Example given; On .XML is holding all squares with their coordinates on the map. When the user loads the map, the 100 squares around the user are loaded.