@GeorgeEdison a little debugging shows me that canvas_context.moveTo(prev_x, prev_y); fails because both prev_x and prev_y are undefined. I wonder where they are lost though.
One practical difficulty is that when you ask or answer a question with an image you want to draw on, you have to publish it first with the unannotated image in it before you can draw on it. But there's nothing you can do about that, the engine would need a "ask in stealth mode" feature to remedy that
@Pekka not only that but also the inventive use of changing the url to pass one or more parameters from the underlying frame back to the parent. Can't you remove a frame at that point?
Basically the methods ended up looking like this (sorry everyone for the long code post):
// When the mouse is clicked... $(canvas_element).mousedown(function(event) {
$(canvas_element).data('drawing', true);
var x = event.pageX - $(canvas_element).offset().left; var y = event.pageY - $(canvas_element).offset().top; // Grab the current coords $(canvas_element).data('prev_x', x); $(canvas_element).data('prev_y', y);
return false;
});
// When the mouse is moved... $(canvas_element).mousemove(function(event) {
// Only do anything if we're drawing on the // canvas at the moment. if($(canvas_element).data('drawing'))
and zips[77545] would be { "cities" : [ { "city":"Arcola","state":"TX"} ] }
so then as you got back your results, you could query for length of the object, and know to present a dialog or return one result or give "that appears to be an invalid request"
@Moshe like that? I would keep it in a database and generate my JSON on the fly, but that's just me
Here is a PNG file: http://imgur.com/NUl4v.png (Yes, never mind that it's a funny penguin with a sign...)
When running the following code:
imagecreatefrompng('http://imgur.com/NUl4v.png');
I get an error:
PHP Warning: imagecreatefrompng() [function.imagecreatefrompng]: Cannot read image ...
To use a file from a remote server, use imagecreatefromstring in conjunction with file_get_contents:
$im = imagecreatefromstring(file_get_contents($imgname));
Note that a URL can be used as a filename with file_get_contents only if fopen wrappers have been enabled.
If this doesn't solve your...
Here is a PNG file: http://imgur.com/NUl4v.png (Yes, never mind that it's a funny penguin with a sign...)
When running the following code:
imagecreatefrompng('http://imgur.com/NUl4v.png');
I get an error:
PHP Warning: imagecreatefrompng() [function.imagecreatefrompng]: Cannot read image ...
To use a file from a remote server, use imagecreatefromstring in conjunction with file_get_contents:
$im = imagecreatefromstring(file_get_contents($imgname));
Note that a URL can be used as a filename with file_get_contents only if fopen wrappers have been enabled.
If this doesn't solve your...
