I need to make a visual effect in that multiple cursors (pointers) are shown simultaneously in different parts of a webpage. The easy solution is to make my own *.cur image and to use it as a 'cursor' css property value for the real cursor and as an image with fixed position for all the fake cursors. By I'm not going the easy way!
I try to access the system's (or browser's) default cursor image and use it, so that everyone will see his own cursor, not mine custom one.
Is there any way to access this image? I mean the one that is used than the css 'cursor' property is set to 'default'.
I believe that to be an Operating System cursor, not browser. I would go for the easy solution to use an custom image for the cursor and using the same image for the fake cursors
Related
Suppose, I have a web page and it's showing in the web browser. Is it possible in Javascript to do the following:
The whole visible webpage (without scrolling, just whatever is visible at a point), I draw an area on that using my mouse (either by drawing or by just selecting a two points as a rectangle).
I click a submit button, and that visible area is converted as an image and saved to the server / client computer or whatever way, but I get the image.
I just want to know whether this is technically feasible, if yes, how ?
Yes, maybe you could try using jsFeedback? I know Google does this as well.
Also, http://html2canvas.hertzen.com/
For security reasons, No. If you're on an intranet or want to use it only privatly you may research into making a custom browser plugin that can do this for you.
I need to make a interactive image gallery (or image slider) where some hotspots need be placed on. It has to be possible to click on those hotspots, to update a sidebar with the corresponding info. Some basic animation must also be possible on a slide or scene of the gallery.
Which setup would be the best solution.
I'm currently thinking about the canvas element, but the lack of specific events for drawn hotspots makes me doubt. EaselJS could be a solution though.
An alternative could be just using a regular javascript image gallery and place some fixed positioned hotspots on it.
This is actually a basic mvc-setup, I have the image gallery, hotspots and the sidebar.
Should I use a javascript mvc library like http://javascriptmvc.com/ or backbone.js
So my question actually is, what would be the best setup, with performance and some basic animation in mind?
Thanks.
other interesting links I found:
http://processingjs.org
http://raphaeljs.com
...
If you are displaying large images or expect users to have older browsers or browsers without current GPU acceleration then you should always use standard HTML4 elements to get this done. Using canvas is overkill and will cause you pain later on if you are not overly-experienced with it.
With DOM-based images you already have click events and can even use image maps to do the click-regions. With canvas you need to code your own click detection and map mouse position to a region to check for clicks.
All in all the simplest solution is usually the best one and for performance and ease of dev, canvas is not the way forward in my opinion.
There are many of us looking for a Javascript/CSS3 solution that can provide a windows7-like UI within a webpage, without using flash.
We need an Opacity mask, rounded borders, and a Blur...
We've got the Opacity and the rounded borders, now we need to be able to apply some Blur effects to a semi-transparent Div.
I tried the BlurFast effect from the Pixastic Library, but it only blurs the actual image, not the background we are seeing trough the image...
Basically, we want a Div to act as a Blur Mask over other contents...
If someone actually succeeded with this, i'll be glad to know its possible :) Thank you
http://t.co/fFLPKnzC
very good article on blur showing the state of the art
sadly "masking" parts of your page, that blur everything behind, is not that easy.
maybe the suggestions in ths blog help you out, as they are very straight forward and from a totally different direction..
therefor to embedd html within svg and use svg-filters on html elements later on
Thought this could be relevant: Aero
Personally, I think the fact that the author states this to be "In other words, one of the most messy and most ineffecient implementations ever"... AND that he can onlt get the effect to work in a single browser... to be extremely telling.
There is no way to do this efficiently or cross-browser at the moment.
The only way you might be able to do it is by using Pixastic to create the blurred image within Canvas, export as dataURI, then use that image as the background for your div. If the div moves, then the positioning of the background-image should move accordingly.
Simple question, really. I just don't have the knowledge to do this with JavaScript, and to also make sure it works with (almost) all browsers...
I am going to design a set of images of a person pointing with one hand in several directions. (Up, down, left, right, diagonal, etc.) Basically, this puppet will be pointing at the location of the mouse. To do so, I want to use an animated GIF file to contain all the images and then use JavaScript to bring the right image to the front, based on the position of the mouse in relation with the image.
My knowlegde of Javascript is very limited, though. Before I even start creating the GIF images, I want to know if it's possible and if there's a solution that would work on any web browser. (Unless it doesn't support JavaScript, of course.)I know it's possible to delay an animated GIF from JavaScript but is it also possible to modify the exact image that needs to be displayed?
As far as I know, this is not possible.
Stuff like this is usually done using the "CSS sprites" technique, where the various stages are glued next to each other into one giant image. That image will then be used as background-image in a smaller element. background-position will determine which image is shown.
Whether this works for you will depend on whether your images are all the same size or not. It has the advantage of working reliably in all browsers, even IE6.
Has anyone got to some good code to zoom into an image using javascript?
I know I could just resize it etc but was being lazy and looking for something clever to zoom to different levels, move around when zoomed etc
Check this:
jQZoom
Zoomimage - jQuery plugin
jQuery ImgZoom
FancyBox
How big are the images?
If they are huge images you do them like google map style using this http://www.casa.ucl.ac.uk/software/googlemapimagecutter.asp
This really depends on what quality you are after. If you need a hires hiquality image with detailed zoom levels and proper interpolation you will need to write a backend service to serve up zoomed portions of your images. If you have no care for quality or speed, you could download the entire image and fit it to display inside a div absolutely positioned, offset for the area you want to view and sized as determined by your zoom level.
I would say you are probably after the first option. There are some tools already made for this, I persoanlly havnt used any of the tools; I am sure othes will post links to others you can try; I have written my own service and client. I cant go into the exact details as its proprietary, but I can give you an overview of what I do.
I have an asp.net generic handler that takes a query string denoting which image (by an id) and the coordinates to zoom on and the target image size. I have the service load the image and crop and resize it (its more complicated than that as I have many optimizations and preparsing when the file is originally uploaded, such as multiple cross sections of the file for faster serving when zooming, but what I describing here is the basics).
That service simply returns type image/jpeg and sends the image.
On the client side I have written a marquee box control that allows the user to marquee an area on the image they want to zoom in on. they marquee the area and click zoom. This then calculates the offsets into the image of the selected coordinates based on the original image size and the viewable image size. I send hese coords to the handler previously mentioned.I load the the url with query string of the srvice into an Image object, and handle onload. If all went well i then swap that to the viewed image and updates all my client side variables for determining where on the image I am zoomed into and then it can be zoomed again or zoomed out or panned further from there.
Now i understand your lazy requirement, but i need to say that writing this is actually quite easy to do to get the basics going. the hardest part you will find is doing a select box. But then even that can be as simple as tracking two click. Top left of the zoom select marque and bottom right. Or not having a select box at all and have a zoom in and out only at predetermined intervals. I on my projects required a zoom box as its a fairly complex image analysis solution.
I hope this at least helpful and leads you to something useful.