I am trying to animate a SKSpriteNode using an array of textures. What I am trying to achieve is to iterate through the texture array and change the SKSpriteNode texture through each iteration and display it's change for about 1 second. The only problem is, the loop is continuing as the animations are taking place I believe, so I can't see the changes.
I essentially want to be able to see each texture on the screen for about a second or two before it changes. Here is what I have so far.
var textures: [SKTexture] = [texture1, texture2, texture3, texture4]
var sprite = SKSpriteNode()
func animateSpriteTextures() {
for texture in textures {
/* Want to pause for about a second or two here, but does not. */
sprite.texture = texture
let scaleDown = SKAction.scaleTo(200, duration: 1)
let scaleUp = SKAction.scaleTo(300, duration: 1)
sprite.runAction(SKAction.sequence([scaleDown, scaleUp]))
}
}
Take a look at the animateWithTextures: action. You could do something like:
sprite.runAction(SKAction.animateWithTextures(textures, timePerFrame: 1.0))
If you need to change the size of the sprite as the animation occurs, then you'll probably want to create an action group SKAction.group() to coordinate the animation and the size changes or maybe animateWithTextures:timePerFrame:resize:restore: would work for you.
Related
I have a question in React implementation for zoom/pan function for a scatter plot.
I wonder what approach would be good and want to hear opinions of React & data visualization expert.
I am specifically interested in implementing zoom/pan function of a scatter plot that is dynamically changing data range to visualize.
(Approach 1) Given a data range (controlled by mouse wheel event), first, filter the data, and render circles () for the filtered data. In this case, each circle will be generated with new key such that
const circles = [];
filteredData.forEach( (d, index) => {
circleProps = { /*..compute circle props... (e.g. position within a SVG) */ }
circles.push(
<circle key={`circle-${index}`} {...circleProps} />
);
});
Thus, every time the data range changes, it will create new set of circles located within the range.
(Approach 2) Similar to Approach 1 but no filtering on the data. Instead, use clip path to visualize only the circles within the range. In this case, it will update entire circles according to re-calculated positions but it will only create the circles one time at the beginning.
What would better approach? Or, any other options to handle large-scale data? Also, please correct me if anything is wrong.
Thanks.
I have trouble getting Map behave properly when calling ZoomToResolution and PanTo
I need to be able to Zoom into specific coordinate and center map.
The only way I got it working is by removing animations:
this.MapControl.ZoomDuration = new TimeSpan(0);
this.MapControl.PanDuration = new TimeSpan(0);
Otherwise if I make call like this:
control.MapControl.ZoomToResolution(ZoomLevel);
control.MapControl.PanTo(MapPoint());
It does one or another (i.e. pan or zoom, but not both). If (after animation) I call this code second time (map already zoomed or panned to needed position/level) - it does second part.
Tried this:
control.MapControl.ZoomToResolution(ZoomLevel, MapPoint());
Same issue, internally it calls above commands
So, my only workaround right now is to set Zoom/Pan duration to 0. And it makes for bad UX when using mouse.
I also tried something like this:
this.MapControl.ZoomDuration = new TimeSpan(0);
this.MapControl.PanDuration = new TimeSpan(0);
control.MapControl.ZoomToResolution(ZoomLevel);
control.MapControl.PanTo(MapPoint());
this.MapControl.ZoomDuration = new TimeSpan(750);
this.MapControl.PanDuration = new TimeSpan(750);
Which seems to be working, but then mouse interaction becomes "crazy". Mouse scroll will make map jump and zoom to random places.
Is there known solution?
The problem is the second operation replaces the previous one. You would have to wait for one to complete before starting the next one. But that probably doesn't give the effect you want.
Instead zoom to an extent, and you'll get the desired behavior. If you don't have the extent but only center and resolution, you can create one using the following:
var zoomToExtent = new Envelope(point.X - resolution * MapControl.ActualWidth/2, point.Y, point.X + resolution * MapControl.ActualWidth/2, point.Y);
Btw it's a little confusing in your code that you call your resolution "ZoomLevel". I assume this is a map resolution, and not a level number right? The esri map control doesn't deal with service-specific levels, but is agnostic to the data's levels and uses a more generic "units per pixels" resolution value.
Im using leaflet to create a photo map, with my own tiles, which works as expected.
Im trying to work out how I can prevent the zoom from following this Quadtree type pattern:
Zoom Level 0 - Entire map width = 256px;
Zoom Level 1 - Entire map width = 512px;
Zoom Level 2 - Entire map width = 1024px;
And so on...
I would like to be able to zoom in say increments of 25% or 100px.
An example of 100px increments:
Zoom Level 0 - Entire map width = 200px;
Zoom Level 1 - Entire map width = 300px;
Zoom Level 2 - Entire map width = 400px;
And so on...
Question:
What is the logic for doing this? If it is at all possible?
My reason for wanting to do this is so that my photo map (which doesnt wrap like a normal map) can be more responsive and fit the users screen size nicely.
I made a demonstration of my issue which can be seen here
The short answer is that you can only show zoom levels for which you have pre-rendered tiles. Leaflet won't create intermediary zoom levels for you.
The long answer is that in order to use do this, you need to define your own CRS scale method and pass it to your map, for example:
L.CRS.CustomZoom = L.extend({}, L.CRS.Simple, {
scale: function (zoom) {
// This method should return the tile grid size
// (which is always square) for a specific zoom
// We want 0 = 200px = 2 tiles # 100x100px,
// 1 = 300px = 3 tiles # 100x100px, etc.
// Ie.: (200 + zoom*100)/100 => 2 + zoom
return 2 + zoom;
}
});
var map = L.map('map', { crs: L.CRS.CustomZoom }).setView([0, 0], 0);
In this example, I've extended L.CRS.Simple, but you can of course extend any CRS from the API you'd like, or even create your own from scratch.
Using a zoom factor which results in a map pixel size that is not a multiple of your tilesize, means your right/bottom edge tiles will only be partially filled with map data. This can be fixed by making the non-map part of such tiles 100% transparent (or same the colour as your background).
However, it is, in my opinion, a much better idea to set the tilesize to match the lowest common denominator, in this case 100px. Remember to reflect this by using the tileSize option in your tile layer. And, of course, you will need to re-render your image into 100x100 pixels tiles instead of the 256x256 tiles you are using currently.
One caveat, the current version of LeafletJS (0.5) has a bug that prevents a custom scale() method from working, due to the TileLayer class being hardcoded to use power-of-2 zoom scaling. However, the change you need to do is minor and hopefully this will be addressed in a future release of Leaflet. Simply change TileLayer._getWrapTileNum() from:
_getWrapTileNum: function () {
// TODO refactor, limit is not valid for non-standard projections
return Math.pow(2, this._getZoomForUrl());
},
To:
_getWrapTileNum: function () {
return this._map.options.crs.scale(this._getZoomForUrl());
},
I am programming a basic GUI in MATLAB that utilizes the mapping toolbox. The GUI will display a grayscale image and then plot discrete points over the data, all of this over the necessary map projection. It is important that I plot onto map axes (those created by the axesm command) rather than the vanilla cartesian space. I have no problem doing all this from the command line, but I cannot find a way to implement a GUI version and its driving me nuts.
The problem is that I need to specify the map axes as being the child of the parent figure. The normal axes has a property that can be set, doing something like:
axesHandle = axes('Parent', parentHandle, ...);
or
set(axesHandle, 'Parent', parentHandle);
However, there is no equivalent parent property for the map axes created by the axesm function, so I have no way to manipulate the axes within the figure. How can I do this?
Update: If I create a plot within the map axes in an empty figure, get(figureHandle, 'Children') returns the handle of the axesm object (thanks #slayton!), so the map axes object must be implicitly added to the children of the figure by MATLAB.
Should I be concerned that the map axes do not refer back to the parent figure, or should I just let it be? I wonder if this is a classic case of MATLAB forcing me to not comply with the standards the manual tells me to implement.
From reading your question what I think you are trying to do is grab the handle of the axes object. This can be done as the axes is created using either axes or subplot
a = axes();
a = subplot(x,y,z);
% both return an handle to the newly created axes object
Additionally if the axes is created automagically by a function call like plot or image you can get the axes handle that too:
p = plot(1:10); %returns a handle to a line object
a = get(p,'Parent');
i = image(); %returns a handle to an image object
a = get(i, 'Parent');
Finally, neither of those two options is available you can always get the axes handle from its containing figure with:
a = get(figureHandle, 'Children');
Remember though that this will return a vector of axes handles if your figure contains more than one axes.
Finally when it comes time to draw draw your points to the axes that contains your map image you simply need to call:
line(xPoints, yPoints, 'linestyle', 'none', 'marker', '.', 'color', 'r', 'size', 15)
This will draw the vertices of the line using large red dots.
I'm not sure if this answers your question because the code you provided doesn't line up with the question you asked.
The code you provided looks like you are trying to move an axes from one figure to another. You can totally do this!
f = figure('Position', [100 100 100 100]);
a = axes('Parent', f);
pause
f2 = figure('Position', [250 100 100 100]);
set(a,'Parent', f2);
After much trial and error and reading of documentation, I have found that there is no way to explicitly specify the parent of the map axes. Instead, they are implicitly added on top of the current axes. In the instance that no axes exist in the current figure, calling axesm creates an axes object and then places the axesm object inside. When you take this route, you have to grab the axes object handle by calling gca:
mapAxesHandle = axesm(...);
axesHandle = gca(...);
This makes it frustrating to use the mapping toolbox when writing a GUI from scratch, but that's the way Mathworks makes it happen. Thanks to #slayton for useful info. I'd upvote but my reputation is <15 :(
So, I'm creating a fairly basic overhead 2d game where users can "draw" a map. (Actually, they dont draw it, the manually input a list of x/y's, but the design aspect isnt important just now.)
When a new tile is added, that tile goes into an array of all tiles ingame.
The centrepoint is 0,0. Tiles can be added in all directions, so may be at 1,1 or 100,100 or -50,-50.
Sometimes I want to determine what tile is at a location. One (imho bad) way of doing this would be to get the x/y and loop through all tiles and check if they are that location.
The way I'm currently doing it is to have a seperate 2d array of null elements, and when a tile is added, its set at that array. (ie tilemap[10][10] = tile[100])
Of course, because the values can go negative, tilemap [0][0] is actually the -1000/-1000 tile. (chosen as an arbitrary limit)
Is there a better way of doing this? I feel like using a massive array of mostly empty objects could be more optimal.
Many thanks.
One possible solution would be to keep an Object or Dictionary where the key is the x/y location.
So if you're adding a tile at 10,20, you can store it in the Object like:
this.m_objs[tileX + "_" + tileY] = new Tile;
So if you want to check if something's at position 10,20 you can by using something like:
public function checkIfExists( x:int, y:int ):void
{
return ( this.m_objs[x + "_" + y] != undefined );
}
I recomend using Dictionary, as searching in it much more faster then searching array. Judhing by possible coords -1000/-1000 it would be a great advantage!