I am trying to draw rectangles in Mapbox that stay upright, while the map gets rotated (and are drawn upright, when the map is already rotated).
I've used the following code to draw rectangles: https://github.com/dqunbp/mapbox-gl-draw-rectangle-restrict-area
However, when I rotate the map, the rectangle rotates too (likewise, when the map is already rotated, the rectangles will be tilted too). Is there any option to keep the rectangle in the upright orientation while the map rotates?
Example of a rectangle rotating with the orientation of the map
Related
I are working on a coloring game for kids.I have used bucket fill and it working fine but the problem is coloring image contains some small areas which are impossible to fill by touching on it. I wanted to Implement zoom in and zoom out so that kids can zoom in to small area fill it and zoom out. I have tried scaling rendertexture but it scale around anchor point. Is there a way that I can scale around the touch location ?
Scaling will always be done around the anchor point. You have to reposition your RenderTexture, after scaling, so your touch location remains centered.
I an using GraphicsContext (gc) inside an AnimationTimer. I am scaling gc, drawing some objects, rotating gc and then drawing an image.
The image appears rotated as planned!
I need to be able to get the rotated rectangle that represents the image so I can check for proximity of the 4 (rotated) corners to other, non rotated objects.
I cannot see how to do this.
I have tried creating a rotated Rectangle to 'mirror' the objects rotation but I cannot see how to draw the Rectangle in the gc.
There is no gc.draw(Node), gc.draw(Rectangle) or gc.draw(Polygon). I need to draw it to confirm on screen that the two match.
My only other option is to break out the geometry set and rotate the points myself but it seem odd that javafx cannot do what I need.
Could somebody please help.
I am drawing custom annotations over an image (circle, arrow etc) in my iPhone app. I allow pinch zooming & drag gestures for these annotations. These annotations are custom made AnnotationView with drawRect drawing circle / line etc.
I am finding issues with zooming
Try 1: The zoom is applied by scale transformation to the AnnotationView. Result: the annotations become blurred.
Try 2: To avoid blurring, I added redrawing with co-ords multiplied by scale factor instead of directly manipulating the transformation. This works without blurring, but, soon the circle etc goes out of the views bounds & is clipped.
I could use a bigger frame (size of full image), but, I am keeping the smaller frame so that I can easily move it back to position when it is dragged out of the window by user's zoom / pan gestures.
Question:
Is there a better way to manage this? I would like to zoom without blurring, while also having the ability to move it back to position if it is dragged out of original image bounds.
I need a 'mask' layer that covers the whole screen, with the center part (a circle) to be transparent. Then I can move the mask layer around using touch. User are only able to see the transparent part in the middle.
I don't think a png file can help because the file need to be very large to cover the whole screen.
So is it possible to do it by coding?
i found this online, but don't know much about openGL. http://www.cocos2d-iphone.org/forum/topic/7921.
it would be great if i can use a CCMaskLayer and input with the radius. i can handle the touch event by my self.
the attached png file is expected result, the center part is transparent. i need this to cover my screen, and only show the middle part. the red part is covered.
I write a CCMaskLayer to do the exactly same thing.
https://github.com/smilingpoplar/CCMaskLayer
You may solve this task with cropped circle texture in two ways:
1) Draw sprite with circle texture in screen center and draw another 4 sprites around (on top, bottom, left and right sides) with small red texture but scaled to cover all screen.
2) (more elegant but harder to implement) Make your mask layer fullscreen but adjust texture coordinates. In details:
set wrap mode to GL_CLAMP_TO_EDGE to your circle texture
adjust texture coordinates of your layer vertices (to do this you need to subclass base CCLayer):
Here v means vertex position and t - texture coordinates. You need to set correct texture coordinates for four corner vertices of layer. For future if you will want to drag circle you will need to add some offset values to texture coordinates.
I use MKMapView.
How to show circle around annotation how in google maps ( when show current user location).
This circle moving with animation to new location and radius of circle dependent from current zoom level.
The annotations themselves don't have a property for showing a circle but you can use a circle overlay with the same center as the coordinate of the annotation to achieve this effect, just like the image below (from one of my projects).
Note: the property for the center of the circle is called "coordinate", just as for the annotations.
The second part is animating the movement. You achieve this by animating the coordinate property of the circle overlay at the same time as the coordinate property of the annotation. This way they will both move together to the new location.
This question can help you with how to move and animate the position of an annotation. If you need the radius of the circle to change at the same time (e.g. when animating the coordinate) you just use Core Animation to animate it together with the coordinate.
Concerning changing the size depending on the zoom level, Map Kit will always handle this for you automatically with Overlays and Annotations so that they always cover the same area of the map, even as the map resizes. (The second image is the same annotations and overlays as below, just zoomed in on the ones to the left (closer to Stockholm in the first image)).