I'm working on adding custom captions to my iOS app that plays videos. I'd like to support all the features of CEA-708 (which are essentially rich-text captions), but I can't figure out how to apply the necessary edge-styles using a UILabel.
The image below shows the edge styles I want to support. However, I am struggling to find a way to achieve raised/depressed edges. Any ideas?
I don't think that those behaviors are expected in iOS. The only idea that I can suggest is to use two labels to achieve those effects, with different z-indexes and positions and colors to obtain the offset similar to the edge.
Otherwise, you can try to take a look to this link https://developer.apple.com/library/ios/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_shadows/dq_shadows.html.
Related
I am interested in to how change hue of the texture in efficient way ? I am experimenting to create space dust which will change it's color every few seconds with nice, smooth transition from one color to another.
I find this possible in few ways:
Using core image like in this example. But I don't know how will this work in combination with Spritekit...
Using particle emitters to create space dust and change color of particles over time using particleColorSequnece property.
And easy one that came up on my mind , while playing with Photoshop, which is using two same, but differently colored images, one over another, and changing the opacity of the topmost one.
This gives me the effect I want, and actually looks fabulous, but is there any better way ? Maybe using SKTexture? In this particular case, I just need to change from one color to another , but what would be an efficient way to do this when multiple changes are required one after another ? This way, my third example requires additional images...
Here is the link which most closely describe what I am trying to accomplish. Just look how space dust changes its color overtime(from dark blue to purple and later to green or orange). I suppose this is done programatically... I would like to ask moderators to remove a link if it is not suitable to post it here. Thanks!
It is kind of a hard questions to answer and is rather subjective, however...
I personally would do the Emitter Node approach, because it seems like it is built for the type of use you are looking for and could have some cool effects trailing behind.
With that being said you specifically asked about changing the hue and colorBlendFactor might be what you are really looking for. I don't have a great link for it, but this might get you pointed in the right direction. You can see how they are blending colors to get the desired result.
Your solution with changing the alpha of two separate colors doesn't sound like a bad approach either.
Hopefully that helps and good luck =)
I'm trying to make that effect, but I don't know how or the name
Of the effect?
That's not "an effect" but could be accomplished a few different ways. If it were me I'd look into Core Image filters (CIFIlters). If you've never used them, start with this Apple example:
https://developer.apple.com/library/prerelease/ios/samplecode/CIFunHouse/Introduction/Intro.html
Then look into changing the size and position of the type, applying pixellation and maybe a bit of blur.
I'm making a GUI for selecting regions to crop from images. I have been using Seesaw and cans select rectangular regions, but cannot find a way to set an image to the background of seesaw.canvas. This suggests using icons on labels. Can I make a label paintable and then use it as a canvas? Is there a way to overlap a label and a canvas or somehow use a panel that gives a background to its contents?
I think Quil has this functionality, but I'm not sure how to build a GUI around its draw, setup, sketch form if I want add widgets.
Existing solutions would appreciated as well, as long as I can decompose them. Using GIMP or Photoshop isn't an option for the workflow I want: multiple crops per photo, of different kinds on each page and different metadata added depending on the type of image outlined. Any suggestions for libraries for working with metadata for photos? I was planning on using a shell interface to exiftool, but a more portable option may be better.
You can draw a java.awt.Image (or sub-class) to a canvas with seesaw.graphics/image-shape:
(require '[seesaw.graphics :as g])
(defn paint-canvas [c g2d]
(g/draw g2d (g/image-shape my-image 0 0) (g/style)))
It seems like that should do it.
Also note that labels (and all Seesaw widgets) are paintable. Just set the :paint option like on a canvas and paint away.
What I basically need to achieve is a Fruit Ninja - style "slash" effect, where the "slash" trails the user's touch and follows the shape of the user's gesture, and is thinner the longer the distance the user has swiped.
The simplest way to achieve this seemed to be to collect all the points the user passes through in a UIBezierPath, and "stretch" an image through the length of the BezierPath. This would achieve the kind of "trailing" effect I was looking for and also ensure that the line is thinner if the distance travelled is longer.
However I can't seem to find a way to actually implement this. Is this even possible?
Alternatives? Thanks.
P.S: This is for a low-medium priority section of a regular app and not a game, so I would like to avoid having go down to OpenGL and spend a lot of time to achieve this (with completely custom drawing, etc). Something at the SDK level would be preferred, and if that's not possible at all, we'll just figure out a different UI.
Thanks!
For pretty easy-to-use stretching teqhniques of images/views you could look into
https://github.com/hfossli/AGGeometryKit/
I recommend trying to draw using CoreGraphics. See this link
http://www.effectiveui.com/blog/2011/12/02/how-to-build-a-simple-painting-app-for-ios/
Okay. Maybe you can use this.
https://github.com/hfossli/AGDraw
Just something I wrote a while ago. Hit clear and try to draw something (clear will toggle between two types of strokes). You'll see the width of the penstroke will increase with the velocity you use.. I guess that fits your need. If you fix some bugs, please make a pull request. You are free to use the code, but I will add a MIT license later.
In CSS Sprites you will often find padding between each image. I believe the idea is so that if the page is resized then one image won't bleed into another.
I think this depends on the different types of browser zoom (best explained by Jeff).
However, I haven't been able to see this behaviour in my tests. Is this only a problem with older browsers? (I havent been able to test with IE6 at the current time so I'm counting that as 'old').
Should I still worry about leaving space? Its kind of a pain.
For instance :
A CSS Sprite I found for AOL has
padding between each image : VIEW
but The Daily Show decided not to
bother : VIEW
It shouldn't need to be padded, but when zoomed, especially in IE8 (betas more than the RC), there is image bleeding if there is no padding.
Best example is to go to Google.com -> Search, and zoom... you'll start to see "underlines" at the bottom right of the image as the zooming rounds up/down.
In theory, a 1px padding on all sides of a sprite should be fine.
Here's the sprite from Google (images)...
But when zoomed, the +,-,x icons bleed into the main Google logo.
Basically the answer is yes. Two years to the day after I asked this question will see the release of IE9. IE9 has this problem just as much - if not more than any other browser...
It's pretty infuriating because it's such a simple thing to fix.
With iPads increasing in marketshare - its's pretty essential to at least have a half decent experience with zooming un-uniform amounts.
I am going to have to put a single pixel border around every image to match the background color of the adjacent element (potentially different on each side). Fortunately I auto-generate all my csssprites based on an .xml file - so I can do this programatically without too much hastle. It's still a huge pain though...
Simon - My experience is that this is certainly still a problem.
In response to your second question, why not use transparent padding? (Perhaps you are still supporting ie6 and this is non-trivial, in which case, I'm really sorry).
Speaking of the older browsers (those using text zoom), you don't always need padding.
The main difference between your two examples is that the Daily Show sprite already includes the menu item's text in the image itself.
When using text zoom, the AOL menu items could stretch out vertically due to the larger font size, and the menu text might even wrap to two lines. To accommodate for such eventualities, those icons need a little padding to ensure they don't bleed. Typically, you'd just try to make sure it doesn't bleed on any of IE6's five text sizes.
Since The Daily Show's menu doesn't contain any (visible) HTML text its size won't be affected by text zoom (though you might need a line-height: 0; or so to be sure), so it doesn't need any padding.
As scunliffe already showed, browsers using page zoom may need sprites to have a little padding due to rounding errors.