KineticJS画布保存到计算机按钮
KineticJS Canvas Save to Computer button
我正在尝试添加一个保存按钮，该按钮将出现在页面上，但不在画布中。我尝试的每一个在线示例似乎都无法正确保存画布。我基本上想让他们点击保存按钮，它要么自动下载为图像，要么打开保存到我的计算机窗口，让他们重命名、移动和保存等。www.jsfiddle.net/sj00qoy/16/
<button id="save">Save as image</button>
<script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v5.0.2.min.js"></script>
<script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v5.1.0.min.js"></script> <script src="http://eligrey.com/demos/FileSaver.js/Blob.js"></script>
<script src="http://eligrey.com/demos/FileSaver.js/canvas-toBlob.js"></script>
<script src="http://eligrey.com/demos/FileSaver.js/FileSaver.js"></script>
<script type="text/javascript" src="https://53d4e26fadb6e09777fddd385fe78ac4b63826d5.googledrive.com/host/0B71KNg66uHaYR014NlB4b0c0ZWc/btq1.js"></script>
好消息：
新的canvas.toBlob方法允许您将画布转换为blob，然后可以使用saveAs让用户将该blob作为映像下载到本地驱动器。
坏消息：
大多数浏览器尚未实现.toBlob和saveAs。
解决方法：
Eli Grey编写了一个很棒的填充程序，允许您在现有浏览器中使用toBlob+saveAs：
https://github.com/eligrey/FileSaver.js
下面是一个使用Eli Grey垫片的例子。
KineticJS实际上是一组画布（层）。对于KineticJS，您有这些额外的步骤来创建一个包含所有KineticJS层的画布。
-
从stage创建一个imageURL（请参阅stage.toDataURL）。
-
从imageURL创建图像。
-
创建内存画布。
-
将您创建的图像绘制到内存画布上。
-
使用内存画布加上Eli Grey的填充程序，让用户按下按钮并将舞台作为图像保存到本地驱动器。
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
var img=new Image()
img.onload=function(){
ctx.fillStyle="red";
ctx.drawImage(img,0,0);
ctx.fillRect(100,100,50,30);
}
img.crossOrigin="anonymous";
img.src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/ship.png";
$("#save").click(function(){
canvas.toBlob(function(blob){ saveAs(blob,"temp4.png"); });
});body{ background-color: ivory; }
canvas{border:1px solid red;}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<button id="save">Save</button><br>
<canvas id="canvas" width=300 height=300></canvas>
<script>
/* FileSaver.js
* A saveAs() FileSaver implementation.
* 2014-08-29
*
* By Eli Grey, http://eligrey.com
* License: X11/MIT
* See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
*/
/*global self */
/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */
/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
var saveAs = saveAs
// IE 10+ (native saveAs)
|| (typeof navigator !== "undefined" &&
navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator))
// Everyone else
|| (function(view) {
"use strict";
// IE <10 is explicitly unsupported
if (typeof navigator !== "undefined" &&
/MSIE [1-9]'./.test(navigator.userAgent)) {
return;
}
var
doc = view.document
// only get URL when necessary in case Blob.js hasn't overridden it yet
, get_URL = function() {
return view.URL || view.webkitURL || view;
}
, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
, can_use_save_link = "download" in save_link
, click = function(node) {
var event = doc.createEvent("MouseEvents");
event.initMouseEvent(
"click", true, false, view, 0, 0, 0, 0, 0
, false, false, false, false, 0, null
);
node.dispatchEvent(event);
}
, webkit_req_fs = view.webkitRequestFileSystem
, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
, throw_outside = function(ex) {
(view.setImmediate || view.setTimeout)(function() {
throw ex;
}, 0);
}
, force_saveable_type = "application/octet-stream"
, fs_min_size = 0
// See https://code.google.com/p/chromium/issues/detail?id=375297#c7 for
// the reasoning behind the timeout and revocation flow
, arbitrary_revoke_timeout = 10
, revoke = function(file) {
var revoker = function() {
if (typeof file === "string") { // file is an object URL
get_URL().revokeObjectURL(file);
} else { // file is a File
file.remove();
}
};
if (view.chrome) {
revoker();
} else {
setTimeout(revoker, arbitrary_revoke_timeout);
}
}
, dispatch = function(filesaver, event_types, event) {
event_types = [].concat(event_types);
var i = event_types.length;
while (i--) {
var listener = filesaver["on" + event_types[i]];
if (typeof listener === "function") {
try {
listener.call(filesaver, event || filesaver);
} catch (ex) {
throw_outside(ex);
}
}
}
}
, FileSaver = function(blob, name) {
// First try a.download, then web filesystem, then object URLs
var
filesaver = this
, type = blob.type
, blob_changed = false
, object_url
, target_view
, dispatch_all = function() {
dispatch(filesaver, "writestart progress write writeend".split(" "));
}
// on any filesys errors revert to saving with object URLs
, fs_error = function() {
// don't create more object URLs than needed
if (blob_changed || !object_url) {
object_url = get_URL().createObjectURL(blob);
}
if (target_view) {
target_view.location.href = object_url;
} else {
var new_tab = view.open(object_url, "_blank");
if (new_tab == undefined && typeof safari !== "undefined") {
//Apple do not allow window.open, see http://bit.ly/1kZffRI
view.location.href = object_url
}
}
filesaver.readyState = filesaver.DONE;
dispatch_all();
revoke(object_url);
}
, abortable = function(func) {
return function() {
if (filesaver.readyState !== filesaver.DONE) {
return func.apply(this, arguments);
}
};
}
, create_if_not_found = {create: true, exclusive: false}
, slice
;
filesaver.readyState = filesaver.INIT;
if (!name) {
name = "download";
}
if (can_use_save_link) {
object_url = get_URL().createObjectURL(blob);
save_link.href = object_url;
save_link.download = name;
click(save_link);
filesaver.readyState = filesaver.DONE;
dispatch_all();
revoke(object_url);
return;
}
// Object and web filesystem URLs have a problem saving in Google Chrome when
// viewed in a tab, so I force save with application/octet-stream
// http://code.google.com/p/chromium/issues/detail?id=91158
// Update: Google errantly closed 91158, I submitted it again:
// https://code.google.com/p/chromium/issues/detail?id=389642
if (view.chrome && type && type !== force_saveable_type) {
slice = blob.slice || blob.webkitSlice;
blob = slice.call(blob, 0, blob.size, force_saveable_type);
blob_changed = true;
}
// Since I can't be sure that the guessed media type will trigger a download
// in WebKit, I append .download to the filename.
// https://bugs.webkit.org/show_bug.cgi?id=65440
if (webkit_req_fs && name !== "download") {
name += ".download";
}
if (type === force_saveable_type || webkit_req_fs) {
target_view = view;
}
if (!req_fs) {
fs_error();
return;
}
fs_min_size += blob.size;
req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {
var save = function() {
dir.getFile(name, create_if_not_found, abortable(function(file) {
file.createWriter(abortable(function(writer) {
writer.onwriteend = function(event) {
target_view.location.href = file.toURL();
filesaver.readyState = filesaver.DONE;
dispatch(filesaver, "writeend", event);
revoke(file);
};
writer.onerror = function() {
var error = writer.error;
if (error.code !== error.ABORT_ERR) {
fs_error();
}
};
"writestart progress write abort".split(" ").forEach(function(event) {
writer["on" + event] = filesaver["on" + event];
});
writer.write(blob);
filesaver.abort = function() {
writer.abort();
filesaver.readyState = filesaver.DONE;
};
filesaver.readyState = filesaver.WRITING;
}), fs_error);
}), fs_error);
};
dir.getFile(name, {create: false}, abortable(function(file) {
// delete file if it already exists
file.remove();
save();
}), abortable(function(ex) {
if (ex.code === ex.NOT_FOUND_ERR) {
save();
} else {
fs_error();
}
}));
}), fs_error);
}), fs_error);
}
, FS_proto = FileSaver.prototype
, saveAs = function(blob, name) {
return new FileSaver(blob, name);
}
;
FS_proto.abort = function() {
var filesaver = this;
filesaver.readyState = filesaver.DONE;
dispatch(filesaver, "abort");
};
FS_proto.readyState = FS_proto.INIT = 0;
FS_proto.WRITING = 1;
FS_proto.DONE = 2;
FS_proto.error =
FS_proto.onwritestart =
FS_proto.onprogress =
FS_proto.onwrite =
FS_proto.onabort =
FS_proto.onerror =
FS_proto.onwriteend =
null;
return saveAs;
}(
typeof self !== "undefined" && self
|| typeof window !== "undefined" && window
|| this.content
));
// `self` is undefined in Firefox for Android content script context
// while `this` is nsIContentFrameMessageManager
// with an attribute `content` that corresponds to the window
if (typeof module !== "undefined" && module !== null) {
module.exports = saveAs;
} else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) {
define([], function() {
return saveAs;
});
}
</script>
<script>
/* canvas-toBlob.js
* A canvas.toBlob() implementation.
* 2013-12-27
*
* By Eli Grey, http://eligrey.com and Devin Samarin, https://github.com/eboyjr
* License: X11/MIT
* See https://github.com/eligrey/canvas-toBlob.js/blob/master/LICENSE.md
*/
/*global self */
/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
plusplus: true */
/*! @source http://purl.eligrey.com/github/canvas-toBlob.js/blob/master/canvas-toBlob.js */
(function(view) {
"use strict";
var
Uint8Array = view.Uint8Array
, HTMLCanvasElement = view.HTMLCanvasElement
, canvas_proto = HTMLCanvasElement && HTMLCanvasElement.prototype
, is_base64_regex = /'s*;'s*base64's*(?:;|$)/i
, to_data_url = "toDataURL"
, base64_ranks
, decode_base64 = function(base64) {
var
len = base64.length
, buffer = new Uint8Array(len / 4 * 3 | 0)
, i = 0
, outptr = 0
, last = [0, 0]
, state = 0
, save = 0
, rank
, code
, undef
;
while (len--) {
code = base64.charCodeAt(i++);
rank = base64_ranks[code-43];
if (rank !== 255 && rank !== undef) {
last[1] = last[0];
last[0] = code;
save = (save << 6) | rank;
state++;
if (state === 4) {
buffer[outptr++] = save >>> 16;
if (last[1] !== 61 /* padding character */) {
buffer[outptr++] = save >>> 8;
}
if (last[0] !== 61 /* padding character */) {
buffer[outptr++] = save;
}
state = 0;
}
}
}
// 2/3 chance there's going to be some null bytes at the end, but that
// doesn't really matter with most image formats.
// If it somehow matters for you, truncate the buffer up outptr.
return buffer;
}
;
if (Uint8Array) {
base64_ranks = new Uint8Array([
62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1
, -1, -1, 0, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25
, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35
, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
]);
}
if (HTMLCanvasElement && !canvas_proto.toBlob) {
canvas_proto.toBlob = function(callback, type /*, ...args*/) {
if (!type) {
type = "image/png";
} if (this.mozGetAsFile) {
callback(this.mozGetAsFile("canvas", type));
return;
} if (this.msToBlob && /^'s*image'/png's*(?:$|;)/i.test(type)) {
callback(this.msToBlob());
return;
}
var
args = Array.prototype.slice.call(arguments, 1)
, dataURI = this[to_data_url].apply(this, args)
, header_end = dataURI.indexOf(",")
, data = dataURI.substring(header_end + 1)
, is_base64 = is_base64_regex.test(dataURI.substring(0, header_end))
, blob
;
if (Blob.fake) {
// no reason to decode a data: URI that's just going to become a data URI again
blob = new Blob
if (is_base64) {
blob.encoding = "base64";
} else {
blob.encoding = "URI";
}
blob.data = data;
blob.size = data.length;
} else if (Uint8Array) {
if (is_base64) {
blob = new Blob([decode_base64(data)], {type: type});
} else {
blob = new Blob([decodeURIComponent(data)], {type: type});
}
}
callback(blob);
};
if (canvas_proto.toDataURLHD) {
canvas_proto.toBlobHD = function() {
to_data_url = "toDataURLHD";
var blob = this.toBlob();
to_data_url = "toDataURL";
return blob;
}
} else {
canvas_proto.toBlobHD = canvas_proto.toBlob;
}
}
}(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));
</script>[关于脚本--只是我的看法]
啊，是的。。。脚本组织。就像厨师一样，每个人似乎都会根据自己的口味改变自己的组织方式。就我个人而言，我是这样做的。（1） 始终将CDN用于jQuery等第三方软件。这是因为jQuery（和其他第三方的东西）可能已经缓存在用户的设备上了。如果浏览器看到它需要jQuery，并且已经缓存了它，那么它将使用缓存的版本，甚至不会下载重复的jQuery。缓存是根据URL进行的，因此如果可能的话，请使用众所周知的CDN。（2a）如果脚本总数<10K，然后我将它们放在一个scripts.js文件中，并将其包含在带有script标记的页面上。（2b）如果脚本总数>10K，那么我会缩小它们，并在带有脚本标记的页面上再次包含缩小后的script.js。回到我的开发计算机上，我保留了一份缩小和未缩小的脚本文件的副本，以防我需要对代码进行维护。更多想法：对于使用许多页面常见的重脚本的网站，我将这些脚本缩小到一个单独的commonScripts.js中。对于重页面特定的脚本，我将那些脚本缩小到单独的脚本文件中，该文件仅包含在所需页面上。不管怎样，这些都不是定律——只是我如何组织脚本。干杯
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