So I am trying to create an atlas using QGIS and I am trying to create a shape that is unique to a single page (the red circle). Naturally, it should show up on the other pages as well. I want it to display only on one page, or better yet, I just want it on a few selected pages. Is this possible? Thanks in advance!
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I have tried a few image filter effects in Core Image with SwiftUI. Like grouping different filters and connect relevant intensity with a Slider to change the filter's intensity.
I'm wondering is there a way to achieve the similar image filter effect like instagram. Because the single one of Core Image filter looks like not that fancy as instagram's. I guess chaining several effects in CI may achieve some of them on instagram, but I simply don't know which one to chain... No idea how to perform those filter effect according their name like "Sierra", "Willow".
So is there a way can achieve those filter effect in Core Image? Or some 3rd party library is needed? Any live example, project, framework/lib or hint is appreciated.
Most of Instagram's filters are achieved by simple lookup tables, i.e. using a map (image) for replacing colors with a mapped color. You can use the CIColorCube filter to achieve something like that in Core Image. You can search the internet for example lookup tables (they usually come in the form of images). There is probably also example code on how to bring them into the right format.
Another thing Instagram does is adding a vignette effect. There is also a Core Image filter for that: CIVignetteEffect.
Let's say you want to build an app where people can find out whether the location the users are on has a risk of being flooded. You want to be able to create flood zone areas on the map and compare the user geolocation relative to the area. How do I do that with google_maps_flutter? or is there any other way to do it with plugins in flutter?
What I have in mind right now is to create polygons on the map and perform some geometric operations with it (if that is even possible). I have Esri SHP files which I will export to json and parse it in flutter and then use the results to draw polygons of the areas.
no code just yet..
You can make use of 'overlay widgets' in Flutter. You can draw, say a circle, indicating a flood zone with colour and radius in accordance with the probability (or other parameters).
Depending on how you want to display, you can create a separate UI control to display the comparision with reference to the user's geo-location.
I want to load an image atlas I have already stored in my computer as a single image into an application. All of the tutorials I have found so far use the creating folder with the .atlas extension. I already have an image atlas. Do I have to break it up into smaller images or is it possible to use it as it is?
This is the image I am referring to:
Just to make it clear, I am not building a game.
Edit
So, what I want basically is to pick one of the squares inside of the atlas image, and use it to create an image that would appear inside the clear view you see in the screenshot
I'm using Mapbox GL JS. Is there any way I can style my base layer to look like the Mapbox Light example, but showing only the UK?
I assume I would use Mapbox Studio to build my own base layer, but I can't see any way in Studio to filter by country.
If that's not possible, is there any way I could show labels on the UK only, and show other countries as filled polygons? (As per this unanswered question.)
Unfortunately it is not possible to filter by a certain geography when selecting the data source for a layer. If you're working with Mapbox's tiles, they'll always cover the entire planet.
There is the possibility to restrict the map to a certain (rectangular) bounds, with the map.setMaxBounds method (https://www.mapbox.com/mapbox-gl-js/api/#Map#setMaxBounds). This might work reasonably well since you want to restrict the view to the UK, but might not be suitable depending on the geometry you want to restrict the view to.
As a workaround you could create a dataset and add a polygon that covers the entire planet except for the extent you want to show in your map. Then add this dataset in your style as the top most layer and style it with whatever you'd like the empty space in your map to look like.
The workaround has been also suggested in this SO answer, if you can get maptiles for the UK only (the SO answer gives a link, but for Germany) you can
upload them to Mapbox as a dataset, export it to tilesets, and then
to a map as a layer. Delete all other layers
You have also the possibility to Style a single country in Mapbox
studio ref this tutorial. The other countries are still shown, but you can style your map in a way to highlight UK
There is a option that allows you to show only one country highlighted. But drawback is, you lose all the layers and tile-level details. Here is the link https://www.mapbox.com/videos/how-to/map-a-single-country-in-mapbox-studio/.
But if you want to include the tile details as well as whole world map but in that map only one or two or custom amount of countries highlighted, then, from above link of Natural Earth download the zipped file of ne_10m_admin_0_countries and upload.
Go back to your map style, and instead of making a blank one. Add another layer of ne_10m_admin_0_countries in your current map. Select the country in the filter option (in same way as shown in video). And change its opacity. That's it.
Hope it helps. Have a great day.
I'm trying to create segmented parts of an image... like the top right square of an image can be highlighted or clicked on while the rest of the image isn't. I tried to google this stuff and I found codes related to container but I'm not sure if that's what I want.. How can I make parts of image segmented so I can fire events on mouseover/mouseselect etc...
You could either define a hitArea (http://www.createjs.com/Docs/EaselJS/classes/DisplayObject.html#property_hitArea) if your image only requires one segment or if you want multiple clickeable areas on one image: Split up the image through using multiple Shapes via beginnBitmapFill (an example for bitmapFill can be found here: http://jsfiddle.net/lannymcnie/nmLhu/) and then put the listeners on the individual shapes.