I have a triangle polygon filled with color and low opacity. That was no problem so far.
What I'm trying to achieve looks like this (without points and lines). It is basically triangle polygon with fill color but opacity smoothly lowering from one of the triangle apexes.
Is there any way to achieve this with mapbox? Thanks!
There is no easy, built in way to do this with Mapbox GL JS.
The best way I can think of is to create a Marker (an HTML object anchored at a specific lat/lng) to draw the shape. You will have to do some maths to translate the coordinates of the triangle's vertices into screen coordinates. You will also have to update the calculations if the viewport zooms or rotates.
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I want to make a 3d graph in unity and on that graph draw curves and surfaces etc. on surfaces I may have the grid texture applied on them, all of this is achievable. but there is one thing effect which I do not know how to achieve.
Many components in this app will be lines, Like the x-axis, y-axis, z-axis, & some grid on the surface, now I want these lines to have constant thickness, I may zoom into or zoom out of stuff but these lines should always be of constant thickness on the screen, a 1px line
should always be 1 pixel no matter I zoom close to it or I zoom away from it.
How can we do it? Is it an Image effect or a Shader or some other trick, I need to know what is the right approach for something like this.
If you need that for editor usage you can use UnityEditor.Handles but you would need Renderers (feg. LineRenderer) to draw it in build
I am aware of this question, and the answer works ok for me but I would like the drawn polygons (hexagons) not to move or scale with the map.
Is there a way to do besides overlaying an SVG on top of the map and drawing on it?
I am having trouble creating a battle royal zone in unity. I want it to be translucent and cover the map with a masked circle in the middle. However, I dont know if there is any way to control the radius of this mask which is something I need to do regularly. Does anyone know how to achive these results?
It should look like the the map view from Fortnite BR.(https://assets.rockpapershotgun.com/images/2019/01/fortnite-small-storm-690x388.jpg/RPSS/resize/690x-1/format/jpg/)
There are a few ways to achieve this effect.
The first and easiest is using the built in Mask, if you are using UI to render the minimap. You can also create a custom UI mesh, as described here for example.
The last option is a (custom) shader. You can download the built-in shaders here and copy over the UI one. Then you have to add your own logic to the fragment shader, something that looks for the Length of the distance of the current UV coordinates and the circle, and if thats smaller than the radius it must be inside. In that case, either clip or set the alpha to 0.
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.
Consider a circle. Now consider a radius of the circle, drawn from the center of the circle towards the right. Now imagine that the radius is rotating about the center of the circle, sweeping out an area as it rotates. My problem is: I want to use iPhone's animation techniques to fill up the swept out area with a different color from the background area of the circle, as the radius rotates from 0 degrees to any chosen number of degrees about the circle.
I've looked through the Core Animation API, KeyFrame Animations, etc. but I am not able to find out how to do this. Any hints will be most welcome.
Thanks,
Sandeep
Check out CAShapeLayer. It lets you animate between two Core Graphics paths, which can be as complex as you want. In this case, you might want to animate between a path which defines a thin filled wedge and a filled wedge that covers a larger angle of the circle. You may need to use a CAKeyframeAnimation to make sure that it is animated in the sweeping motion you desire, and in the direction you want.