I'd like to circle mask the following:
See on maphttp://a.tiles.mapbox.com/v3/sinan.map-l9wtmm6y.html#15/41.00996511838453/28.974809646606428'>
I checked the previous topics but since I am very new to html I couldn't find the answer.
appreciate your helps.
It would depend on how you want to go about it, the simplest and unfortunately the least robust route would be to create a large .png with the alpha in the center transparent.
There are also ways to do it using html5 canvas, CSS3, etc. but I think the more important question is what you are trying to do with it before you decide the route to take. (do you need it to resize, do you need it to change colors, etc.) Here is a link to another stack overflow post that may get you on your way.
Best way to mask an image in HTML5
Related
My problem is that I have some objects I want to create a highlight around. Currently I am using glowfilter to do this, it works perfectly fine most of the time. But when I have partly transparent objects I get a problem, for example, a window, since the glass in the window is transparent the glowfilter will be visible through it.
Is there a solution on how to make a nice outline, without having to worry about transparency?
Thank you in advance!
OK there are two answers, one is easy and non-coding based, and the other requires the first answer plus coding and is non-trivial.
Easy answer: Don't use transparency. Flatten the source image, copy your part, and put a GlowFilter on it. Simple, and probably the way you should go.
Not easy answer: What you're seeing is the normal behavior for Bitmap filters. Instead, you will need to use a combination of at least two bitmaps, one without any interior transparency (same image part as in the Easy answer) that uses a GlowFilter with the knockout parameter set to true, and the other identical bitmap, without a filter, placed directly over it if you are intending to slide things between the device and the highlight. Doing this is way beyond the scope of a simple question, and you should research it if the Easy Answer doesn't do it.
I have to place on a web page a cylinder that looks like this:
it is composed by small images that overlaps to draw the curves on the surface. Every one of them is places on the page with a different img tag enveloped in an anchor with its own href. The z-index property of the img is used to make them overlap in the right way.
The cylinder has to be composed because it is dynamically created, as you can see from the image, its faces can have different colors.
What i need to do is to make all the faces clickable and each one has to point to a different URL.
My problem is, of course, that the cylinder has curves. And i have to be sure that the clicks points to the correct URL especially near the curves, it hasn't to be precise at pixel level, but at least acceptable.
I've tried to use a map with a single area for each of the images that composes the cylinder, but of course it didn't work, as i saw from the specifications, in such cases only the first declared map in the DOM works.
I'm thinking about to solve this via Javascript, but i think it wouldn't be an easy job, so i would be happy if someone can give me some advice on what should i try.
Oh, i cannot use HTML5 features to solve this.
Neat application of older technology to solve a challenging puzzle.
I can think of two ways forward for you. One is to put a transparent (rectangular) image on top of the cylinder and create an HTML image map, using the shape="poly" attribute. For resources, search for the HTML elements map and area for reference, especially the shape attribute. There should be many good tutorials online. Nowadays this technique isn't used that much any more, but it was really popular in the late 90s.
Another way is to use event delegation in javascript, attaching an event listener to the primary container. On each of your image "pixels" apply a CSS class for the appropriate portion of the cylinder it is in. In your event handler, you can do something differently depending on the class of the clicked on image, and you can do this without the massive overhead of attaching an event on each individual "pixel". In JQuery this would be something like:
$("#cylinder").on("click", ".green", function() { location.href = "green_url"; }
$("#cylinder").on("click", ".red", function() { location.href = "red url"; }
assuming you put class="green" on your green pixels and class="red" on your red pixels. (You can do this by quadrant or other technique; color is just an example).
Your best luck SVG ! https://developer.mozilla.org/en-US/docs/SVG/Tutorial
It is almost impossible with html dom elements to do this, you will have to bend it with CSS compatible all browsers.
There is also Canvas but you will have a hard time dealing with the clicks.
Only problem with SVG is that it's not supported in < IE8, and hardly in IE8. But bending a DOM element is also not available < IE9.
EDIT:
I saw that you can't use HTML5, so your only chance is generating the whole image in GD2 for example and trying to map the points. But what is the reason you can't use HTML5 ?
You might also try doing it using javascript / canvas via getImageData() function. This canvas function will rgba values of the given point. Using the alpha value you can check if mouse is over or clicking on the correct area or if it is a transparent area and nothing should happen.
I also made jquery plugin exactly for this purpose. Maybe it might help. http://www.cw-internetdienste.de/pixelselection/
I am trying to create a similar effect as seen here:
http://timothypoon.com/blog/2011/01/19/html5-canvas-particle-animation/
However, I can't seem to get this to work on my page and I would like to apply this effect in a div that contains an image. Is this possible or does everything have to happen on the canvas?
When I try to recreate the effect described in the tutorial I get lots of errors such as variables not being defined etc.
You could re-create this using Canvas, or using CSS transformations and shadows, or a mixture of the two. As for the undefined variables, I can't help as you've not posted your code.
A clean approach would be to do everything within the canvas, using JavaScript. You can draw both the foreground grass, and background mountains to the canvas. However if you want to partly use a <div>, you can overlay the div on top of the canvas using CSS position:fixed or position:absolute, also using CSS z-index to set their order.
I recommend the following link, scroll down for the image drawing:
http://thinkvitamin.com/code/how-to-draw-with-html-5-canvas/
I don't know how else I can help, as the tutorial that you've provided explains everything quite well. But if you've got any further queries, feel free to comment, or update your question.
You can use the proton particle engine easily achieve the effect you want, Its API is very simple.http://a-jie.github.io/Proton/
Bit of background
I've been producing a Flash-driven webcomic for three years now, incorporating some basic animation, a synced soundtrack and zoom-drag page viewing. The recent Flash-bashing, my desire to reach iHandhelds and my preference for open versus proprietary means that I want to make the move to HTML5 techniques this year. In the long-term, I think the writing's on the wall for Adobe's product, and I'm not entirely convinced that's a bad thing.
I'm relatively comfortably with both CSS and HTML, having worked a little in web design before. However, JavaScript is a foreign country to me, and I simply wanted to get some advice as to
whether what I want to achieve can be accomplished consistently across all browsers and
what the best techniques/approaches to the problem would be.
Any advice, even general principles, are very welcome. I've already sought out several HTML5 tutorials and introductions, which lead me to believe that the canvas element will be foundational to my plan; however while all the individual problems I face have been answered by many blogposts and guides, combining the various solutions into a single entity is something I'm not currently able to figure out, as I'm not certain of the limitations of the new HTML5 tags, or of best practice.
If I'm successful in achieving what I'm after, I'm going to post the full code online with an explanation of all the elements. Webcomics might not be a huge domain, but having a resource that did this would have made my life a lot easier - hopefully it'll help someone else in a similar position.
What I'm after
Here's a diagram giving the basics of the design requirements. I'll explain the elements, and the desired extras, below.
(Perhaps the simplest way to demonstrate what I'm after would be for interested folks head over to my website and see how my comic currently works. This isn't a plug - it would simply give the quickest insight.)
At core, I'm after a viewer that will:
display text (SVG image) in a canvas element above an raster image the page's panel art
both images should be zoom-and-draggable in sync but should ideally fade in separately, with the raster image coming first, followed by the SVG image
I'm guessing that the best way to accomplish this would be to layer two canvas elements one above the other using z-index, with the SVG file in the uppermost element. These could then be nested, as in the diagram, within a div element that would carry the zoom-drag function. Is this a reasonable approach, or are there more efficient options?
The next and previous buttons are self-explanatory. Would it best to have each page (bearing in mind some will involve animation and music) on a separate page, or to have all pages within a chapter on a single page, with the buttons making them visible progressively? I imagine this would have a great impact on loading speeds.
Finally, I'd like to have the viewer capable of displaying fullscreen if the reader desires. I imagine this could be accomplished by using Javascript to make the canvas elements and their surrounding div switch between different CSS giving a px-defined size and 100% height and width. Is this a good approach? Is it possible to apply the size change to the div element only and have the canvas elements automatically follow suit, possibly by defining their size via % in CSS?
Desired extras
At various points in the comic I make use of basic animation techniques - simple movements of layered raster images across the viewing pane. This would be simple to accomplish, I imagine, using Javascript; am I correct in thinking that applying overflow:hidden to the wrapping div will prevent images larger than the viewing area from spilling outside the viewer area?
I also want to synchronise audio with some of these animations. I understand that synchronising canvas events with the audio would be the best way to do this on, permitting both to begin activity only upon page loading or next button click.
That's about everything. As said, any advice at whatever level would be greatly appreciated, even if it's 'yes' or 'no' to the various questions I've asked. At root, it would also be good to know if HTML5 is the best option for what I'm after or whether (with gritted teeth) I should stick to Flash for now and go after handhelds using Adobe AIR.
As a front-end developer, I've been given a mock-up design to implement. This design features several tachograph-style icons, which have me stumped as to the best way to mark them up in HTML and CSS.
The images look like the following:
Obviously these assets represent the empty state and the full state respectively.
My issue is this: how can I mark-up these images so that I can show varying levels of completion, i.e. 10% full, 60% full etc?
Waiting in anticipation to hear your answers.
I would seriously recommend looking into the Raphael javascript library. You can knock something like this up in just a few lines of code.
See also this question: Drawing a half gauge/speedometer (JavaScript Canvas or Java Swing Example needed) where I gave an answer including a four-line code sample using Raphael, which provides an animated fuel gauge. You'll need to tweak it for your design, but even then it's only going to be a few lines of code.
The great thing about using Raphael to draw things like this is that it is fully compatible with older browsers, even IE (as far back as IE6 if you need it), without you having to do any special code to support it. It's a great little library.
Hope that helps.
Given that the image reprisents actual data and isn't purely a design mechanism, I'd mark the image up as an HTML image.
<img ... alt="10%">
If your concern is about showing portions of the image, one way you could do this would be to set the image as a background to some container and use width and height to identify the amount of the image to show.
i'm not an expert on html5 /css3, but would you not use the html5 arc command to create a mask to reveal the full state.
As you have a 270 degree rotation from empty to full, you'd just map the value as percentage of 270 to create the value of the arc that would mask the appropriate value.
I believe that there is a java script Math.PI that might help to.