What is the best way to create an image of a motorcycle for example and show a tooltip and add to cart option for each part that is hovered over?
A HTML5 Canvas might suit your needs but this will require quite a lot of calculation in Javascript.
Checking coordinates:
http://www.html5canvastutorials.com/advanced/html5-canvas-mouse-coordinates/
How to draw images:
http://www.html5canvastutorials.com/tutorials/html5-canvas-images/
After that you can do a hover check using the X-Y coordinates of your mouse to determine which popup to show.
Related
In my markup, I add a label on it using (x,y) co-ordinates using "markup.markups[0].getClientPosition". This works, but if I change camera mode or rotate it will lose it place, so am wondering how I can put it back to the new position as per the new markup position?
I understand I have to add event listener for "CAMERA_CHANGE_EVENT", but how I should relate the label with its corresponding svg markup, what if there are more than one markups?
Thanks in advance.
I'd suggest to use the 3d markup extension to make things easier - it supports navigation right out of the box
Follow here to get started: https://forge.autodesk.com/blog/3d-markup-icons-and-info-card
Or SVG markups work well as well: https://forge.autodesk.com/blog/create-pushpin-markup-svg
I wonder is it possible to exclude SVG element (like circle) only from zoom (scale) functionality and preserve his panning. For example: in map i point my current position with red filled circle. When user zoom, i want that this circle have a constant radius. When user pan - i want circle to pan with all other viewport content.
I found this solution:
Scale independent elements
But it seems that i can't figure out how to use it correctly with svg-pan-zoom library.
Also I wonder for similar task - is it possible to drag and drop some element? Mean just that element to be excluded from pan functionality? I was try some approach like jQuery draggable but with no luck.
Thank you
Well after a few weeks I've some kind of workaround. I use onZoom event handler of ariutta/svg-pan-zoom library and write a simple function like this:
onZoom=function(currZoom){
document.getElementById("marker").setAttribute("r", 2/currZoom);
}
In my case I have a little circle which represent current position. Now, when user zoom, library pass current zoom level as argument, and we divide him to radius and off we go!
Also i found a way to achieve my other question. Drag and drop is possible if we use enablePan / disablePan in corresponding mouse event on desired element. I can't post code example for now, because i still cant clarify how to calculate exact dX/dY to match to current zoom level, but that definitely work.
I currently have an html page that produces a line graph inside a canvas element. I have also implemented a feature so that when you click on a point in the graph, a table below the canvas displays the information for that graph point, and clears if you click somewhere that isn't a graph point on the canvas. However, there is currently no indicator for what graph point you have selected.
I would like to make it so that the dot you click on either gets bigger, or highlighted, or something. Unfortunately, I don't think there's any way to do that on the one canvas without needing to redraw the entire graph afterwards. If I drew a bigger dot on top of the original, I would then need to erase it and replace it with the smaller one, as well as redrawing the segment of the line graph that was covered by the larger dot.
I was looking into using a second canvas on top of the first with identical dimensions, using a z-index to control which was on top. However, I don't know how this would affect the click event. If two canvasses are on top of each other, is it possible for the click event to register the lower canvas? Does it only register the higher one? I guess I could just change the click event to be for whichever canvas is on top, but keep all the code for drawing on the canvas the same.
Any advice for how to solve this problem?
Solved a few of my own questions.
Firstly, the click event will only recognize whichever canvas is on top. However, I did like I said, and changed my click event to be for the top canvas, while leaving all instructions on the inside to be for the top canvas. Thank goodness I didn't use the 'this' keyword, or the change would have been much more annoying.
To make the graph points highlight, I first added a second canvas on top of my first one, placing them on top of each other by making their positions "absolute" and giving them a z-index of 0 and 1 respectively. Then, inside the if statement where the original click event recognized that a point had been clicked on, I told the top canvas to draw a larger dot on the same coordinates as the first dot (which I had saved in an array). First, I had it clear the top canvas though, so any other highlighted dots would no longer be highlighted. If the canvas was clicked on somewhere other than a dot, nothing was highlighted.
I am playing around with HTML5 Canvas to develop an interactive personal website.
I created a canvas 400x200 and then put a background image on it. Now on top of the BG Image, I have placed 5 more images. Now, my requirement is, depending on the image clicked I want to 1, display a text outside of the canvas, and 2, grey out the other 4 images (more in an animated form).
I am able to accomplish till displaying the images, I am unable to create a click event action. Is it because the whole canvas is treated as one single image? if so would using #usemap work? I tried adding a addEventListener event but nothing is happening.
is there a easier way in SVG to accomplish the same?
Thanks for any pointers.
You can add click handler on the canvas using jquery like this
$("#canvasId").click(function(e){
alert("canvas clicked";
}
Now you will have to determine the image at which the click event was occurred. If you know the top-left and bottomRight corner of the image you can determine the image on which you had clicked. To determine the mouse location you can use something like following
var x = Math.floor((e.pageX-$("#canvasId").offset().left) / 20);
var y = Math.floor((e.pageY-$("#canvasId").offset().top) / 20);
Im looking for an easy to use method of assigning drag behavior to multiple objects (images, shapes etc) in canvas. Does anyone have a good way or know of any libraries for dragging objects around? Thanks
Creating your own mouse events takes a little work - ideally you should either create or use some kind of mini-library. I'm thinking of creating something like this in the near future. Anyway, I created a drag and drop demo on jsFiddle showing how to drag images - you can view it here.
You can create draggable images like this:
var myImage = new DragImage(sourcePath, x, y);
Let me know if you have any questions about this. Hope it helps.
EDIT
There was a bug when dragging multiple images. Here is a new version.
Another thing you might want to check out is easeljs it sort of in the style of AS3... mouseEvents dragging etc...
The HTML Canvas—unlike SVG or HTML—uses a non-retained (or immediate) graphics API. This means that when you draw something (like an image) to the canvas no knowledge of that thing remains. The only thing left is pixels on the canvas, blended with all the previous pixels. You can't really drag a subset of pixels; for one thing, the pixels that were 'under' them are gone. What you would have to do is:
Track the mousedown event and see if it's in the 'right' location for dragging. (You'll have to keep track of what images/objects are where and perform mouse hit detection.)
As the user drags the mouse, redraw the entire canvas from scratch, drawing the image in a new location each time based on the offset between the current mouse location and the initial mousedown location.
Some alternatives that I might suggest:
SVG
Pure HTML
Multiple layered canvases, and drag one transparent canvas over another.
The HTML Canvas is good for a lot of things. User interaction with "elements" that appear to be distinct (but are not) is not one of those things.
Update: Here are some examples showing dragging on the canvas:
http://developer.yahoo.com/yui/examples/dragdrop/dd-region.html
http://www.redsquirrel.com/dave/work/interactivecanvas/
http://langexplr.blogspot.com/2008/11/using-canvas-html-element.html
None of these have created a separate library for tracking your shapes for you, however.
KineticJS is one such Javascript Library that u can use exclusively for animations
Heres the Link html5canvastutorials
Canvas and jCanvas
You're definitely gonna want to check out jCanvas. It's a super clean wrapper for Canvas, which kicks open a lot of doors without adding code complexity. It makes things like this a breeze.
For example, here's a little sandbox of something close to what you're after, with dragging and redrawing built right in:
Drawing an Arrow Between Two Elements.
I ventured down the road of doing everything with DIVs and jQuery but it always fell short on interactivity and quality.
Hope that helps others, like me.
JP
As you create new objects whether they are windows, cards, shapes or images to be draggable, you can store them in an array of "objects currently not selected". When you click on them or select them or start dragging them you can remove them from the array of "objects not selected". This way you can control what can move in the event of a particular mousedown event or mousemove event by checking if it isn't selected. If it is selected it will not be in the "not selected" array and you can move the mouse pointer over other shapes while dragging shapes without them becoming dragged.
Creating arrays of objects you would like to drag also helps with hierarchy. Canvas draws the pixels belonging to the foremost object last. So if the objects are in an array you simply switch their instance as in element in the array say from objectArray[20] to objectArray[4] as you iterate through the array and draw the objects stored in the array elements you can change whether other objects are seen on top or behind other objects.