refactored a little after running through jslint
This commit is contained in:
Bala Clark
parent
b0c0016c0a
commit
2dbbca3539
1 changed files with 275 additions and 273 deletions
548
scripts.js
548
scripts.js
|
|
@ -1,273 +1,275 @@
|
||||||
/*
|
/*jslint on: true, eqeqeq: true */
|
||||||
TODOs:
|
/*
|
||||||
|
TODOs:
|
||||||
Fo sho:
|
|
||||||
- The buffer is actually loading all the images at the same time, only load the next one on page.onload
|
Fo sho:
|
||||||
- Show a progress bar when buffering
|
- The buffer is actually loading all the images at the same time, only load the next one on page.onload
|
||||||
- use document.body.offsetWidth where present? (instead of window.innerWidth, the former excludes the width of scrollbars)
|
- Show a progress bar when buffering
|
||||||
- scroll two pages at a time in double page mode
|
- use document.body.offsetWidth where present? (instead of window.innerWidth, the former excludes the width of scrollbars)
|
||||||
- manga mode
|
- scroll two pages at a time in double page mode
|
||||||
- page controls
|
- manga mode
|
||||||
- thumbnail browser
|
- page controls
|
||||||
- chrome frame
|
- thumbnail browser
|
||||||
|
- chrome frame
|
||||||
Nice 2 have:
|
|
||||||
- remember position (use localStorage)
|
Nice 2 have:
|
||||||
- maybe use local storage for the pages array too? might be easier to implement manga mode with that
|
- remember position (use localStorage)
|
||||||
- offline mode
|
- maybe use local storage for the pages array too? might be easier to implement manga mode with that
|
||||||
- page turn animation
|
- offline mode
|
||||||
|
- page turn animation
|
||||||
*/
|
|
||||||
|
*/
|
||||||
var book
|
|
||||||
|
/**
|
||||||
window.onload = function() {
|
* Merge two arrays. Any properties in b will replace the same properties in
|
||||||
|
* a. New properties from b will be added to a.
|
||||||
var pages = [
|
*
|
||||||
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/00.jpg",
|
* @param a {Object}
|
||||||
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/01.jpg",
|
* @param b {Object}
|
||||||
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/02.jpg",
|
*/
|
||||||
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/03.jpg",
|
function merge(a, b) {
|
||||||
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/04.jpg",
|
|
||||||
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/05.jpg",
|
var prop;
|
||||||
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/06.jpg"
|
|
||||||
];
|
if (typeof b === "undefined") { b = {}; }
|
||||||
|
|
||||||
var options = {
|
for (prop in a) {
|
||||||
displayMode: "double",
|
if (a.hasOwnProperty(prop)) {
|
||||||
zoomMode: "fitWidth"
|
if (prop in b) { continue; }
|
||||||
}
|
b[prop] = a[prop];
|
||||||
|
}
|
||||||
book = new ComicBook("comic", pages, options);
|
}
|
||||||
book.draw();
|
|
||||||
}
|
return b;
|
||||||
|
}
|
||||||
window.onresize = function() {
|
|
||||||
book.draw();
|
function ComicBook(id, srcs, opts) {
|
||||||
}
|
|
||||||
|
this.id = id; // canvas element id
|
||||||
function ComicBook(id, srcs, opts) {
|
this.srcs = srcs; // array of image srcs for pages
|
||||||
|
|
||||||
this.id = id;
|
var defaults = {
|
||||||
this.srcs = srcs;
|
displayMode: "double", // single / double
|
||||||
|
zoomMode: "fitWidth" // manual / fitWidth
|
||||||
var defaults = {
|
};
|
||||||
displayMode: "double", // single / double
|
|
||||||
zoomMode: "fitWidth" // manual / fitWidth
|
var options = merge(defaults, opts); // options array for internal use
|
||||||
}
|
|
||||||
var options = merge(defaults, opts);
|
var pages = []; // array of preloaded Image objects
|
||||||
|
var canvas; // the HTML5 canvas object
|
||||||
var pages = [];
|
var context; // the 2d drawing context
|
||||||
var canvas;
|
|
||||||
var context;
|
var buffer = 4; // image preload buffer level
|
||||||
|
var pointer = 0; // the current page
|
||||||
var buffer = 4;
|
var loaded = 0; // the amount of images that have been loaded so far
|
||||||
var pointer = 0;
|
|
||||||
var loaded = 0;
|
var scale = 1; // page zoom scale, 1 = 100%
|
||||||
|
|
||||||
var scale = 1;
|
/**
|
||||||
|
* Figure out the cursor position relative to the canvas.
|
||||||
/*
|
*
|
||||||
* @param {String} id The canvas ID to draw the comic on.
|
* Thanks to: Mark Pilgrim & http://diveintohtml5.org/canvas.html
|
||||||
* @param {Object} srcs An array of all the comic page srcs, in order
|
*/
|
||||||
* @see #preload
|
function getCursorPosition(e) {
|
||||||
*/
|
|
||||||
ComicBook.prototype.draw = function() {
|
var x; // horizontal cursor position
|
||||||
|
|
||||||
// setup canvas
|
// check if page relative positions exist, if not figure them out
|
||||||
canvas = document.getElementById(this.id);
|
if (e.pageX) {
|
||||||
context = canvas.getContext("2d");
|
x = e.pageX;
|
||||||
|
} else {
|
||||||
// preload images if needed
|
x = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
|
||||||
if (pages.length != this.srcs.length) this.preload(this.srcs);
|
}
|
||||||
else this.drawPage();
|
|
||||||
|
// make the position relative to the canvas
|
||||||
// add page controls
|
x -= canvas.offsetLeft;
|
||||||
canvas.addEventListener("click", ComicBook.prototype.navigation, false);
|
|
||||||
}
|
// check if the user clicked on the left or right side
|
||||||
|
return (x <= canvas.width / 2) ? 'left' : 'right';
|
||||||
/*
|
}
|
||||||
* Zoom the canvas
|
|
||||||
*
|
/*
|
||||||
* @param new_scale {Number} Scale the canvas to this ratio
|
* @param {String} id The canvas ID to draw the comic on.
|
||||||
*/
|
* @param {Object} srcs An array of all the comic page srcs, in order
|
||||||
ComicBook.prototype.zoom = function(new_scale) {
|
* @see #preload
|
||||||
options.zoomMode = "manual";
|
*/
|
||||||
scale = new_scale;
|
ComicBook.prototype.draw = function () {
|
||||||
if (typeof pages[pointer] == "object") this.drawPage();
|
|
||||||
}
|
// setup canvas
|
||||||
|
canvas = document.getElementById(this.id);
|
||||||
/**
|
context = canvas.getContext("2d");
|
||||||
* Preload all images, draw the page only after a given number have been loaded.
|
|
||||||
*
|
// preload images if needed
|
||||||
* @param srcs {Object} srcs
|
if (pages.length != this.srcs.length) { this.preload(this.srcs); }
|
||||||
* @see #drawPage
|
else { this.drawPage(); }
|
||||||
*/
|
|
||||||
ComicBook.prototype.preload = function(srcs) {
|
// add page controls
|
||||||
|
canvas.addEventListener("click", ComicBook.prototype.navigation, false);
|
||||||
if (srcs.length < buffer) buffer = srcs.length; // don't get stuck if the buffer level is higher than the number of pages
|
};
|
||||||
|
|
||||||
srcs.forEach(function(src, i) {
|
/*
|
||||||
|
* Zoom the canvas
|
||||||
var page = new Image();
|
*
|
||||||
|
* @param new_scale {Number} Scale the canvas to this ratio
|
||||||
page.src = src;
|
*/
|
||||||
|
ComicBook.prototype.zoom = function (new_scale) {
|
||||||
page.onload = function() {
|
options.zoomMode = "manual";
|
||||||
pages[i] = this; loaded++;
|
scale = new_scale;
|
||||||
if (loaded == buffer) ComicBook.prototype.drawPage();
|
if (typeof pages[pointer] == "object") { this.drawPage(); }
|
||||||
}
|
};
|
||||||
});
|
|
||||||
}
|
/**
|
||||||
|
* Preload all images, draw the page only after a given number have been loaded.
|
||||||
/**
|
*
|
||||||
* Draw the current page in the canvas
|
* @param srcs {Object} srcs
|
||||||
*
|
* @see #drawPage
|
||||||
* TODO: break this down into drawSinglePage() & drawDoublePage()
|
*/
|
||||||
* TODO: if the current browser doesn't have canvas support, use img tags
|
ComicBook.prototype.preload = function (srcs) {
|
||||||
*/
|
|
||||||
ComicBook.prototype.drawPage = function() {
|
if (srcs.length < buffer) { buffer = srcs.length; } // don't get stuck if the buffer level is higher than the number of pages
|
||||||
|
|
||||||
var zoom_scale;
|
srcs.forEach(function(src, i) {
|
||||||
var offsetW = 0, offsetH = 0;
|
|
||||||
|
var page = new Image();
|
||||||
var page = pages[pointer];
|
|
||||||
var page2 = pages[pointer + 1];
|
page.src = src;
|
||||||
|
|
||||||
if (typeof page != "object") throw "invalid page type '"+ typeof page +"'";
|
page.onload = function () {
|
||||||
|
pages[i] = this; loaded++;
|
||||||
var width = page.width;
|
if (loaded == buffer) { ComicBook.prototype.drawPage(); }
|
||||||
|
};
|
||||||
if (options.displayMode == "double") {
|
});
|
||||||
|
};
|
||||||
// for double page spreads, factor in the width of both pages
|
|
||||||
if (typeof page2 == "object") width += page2.width;
|
/**
|
||||||
|
* Draw the current page in the canvas
|
||||||
// if this is the last page and there is no page2, still keep the canvas wide
|
*
|
||||||
else width += width;
|
* TODO: break this down into drawSinglePage() & drawDoublePage()
|
||||||
}
|
* TODO: if the current browser doesn't have canvas support, use img tags
|
||||||
|
*/
|
||||||
// update the page scale if a non manual mode has been chosen
|
ComicBook.prototype.drawPage = function () {
|
||||||
switch(options.zoomMode) {
|
|
||||||
|
var zoom_scale;
|
||||||
case "manual":
|
var offsetW = 0, offsetH = 0;
|
||||||
zoom_scale = (options.displayMode == "double") ? scale * 2 : scale;
|
|
||||||
break;
|
var page = pages[pointer];
|
||||||
|
var page2 = pages[pointer + 1];
|
||||||
case "fitWidth":
|
|
||||||
zoom_scale = (window.innerWidth > width)
|
if (typeof page != "object") { throw "invalid page type '"+ typeof page +"'"; }
|
||||||
? ((window.innerWidth - width) / window.innerWidth) + 1 // scale up if the window is wider than the page
|
|
||||||
: window.innerWidth / width; // scale down if the window is narrower than the page
|
var width = page.width;
|
||||||
break;
|
|
||||||
|
if (options.displayMode == "double") {
|
||||||
default:throw "invalid zoomMode";
|
|
||||||
}
|
// for double page spreads, factor in the width of both pages
|
||||||
|
if (typeof page2 == "object") { width += page2.width; }
|
||||||
var canvas_width = page.width * zoom_scale;
|
|
||||||
var canvas_height = page.height * zoom_scale;
|
// if this is the last page and there is no page2, still keep the canvas wide
|
||||||
|
else { width += width; }
|
||||||
var page_width = (options.zoomMode == "manual") ? page.width * scale : canvas_width;
|
}
|
||||||
var page_height = (options.zoomMode == "manual") ? page.height * scale : canvas_height;
|
|
||||||
|
// update the page scale if a non manual mode has been chosen
|
||||||
canvas_height = page_height;
|
switch(options.zoomMode) {
|
||||||
|
|
||||||
// make sure the canvas is always at least full screen, even if the page is more narrow than the screen
|
case "manual":
|
||||||
canvas.width = (canvas_width < window.innerWidth) ? window.innerWidth : canvas_width;
|
zoom_scale = (options.displayMode == "double") ? scale * 2 : scale;
|
||||||
canvas.height = (canvas_height < window.innerHeight) ? window.innerHeight : canvas_height;
|
break;
|
||||||
|
|
||||||
// work out a horizonal position that will keep the pages always centred
|
case "fitWidth":
|
||||||
if (canvas_width < window.innerWidth && options.zoomMode == "manual") {
|
zoom_scale = (window.innerWidth > width) ? ((window.innerWidth - width) / window.innerWidth) + 1 // scale up if the window is wider than the page
|
||||||
offsetW = (window.innerWidth - page_width) / 2;
|
: window.innerWidth / width; // scale down if the window is narrower than the page
|
||||||
if (options.displayMode == "double") offsetW = offsetW - page_width / 2;
|
break;
|
||||||
|
|
||||||
}
|
default:throw "invalid zoomMode";
|
||||||
|
}
|
||||||
// work out a vertical position that will keep the pages always centred
|
|
||||||
if (canvas_height < window.innerHeight && options.zoomMode == "manual") {
|
var canvas_width = page.width * zoom_scale;
|
||||||
offsetH = (window.innerHeight - page_height) / 2;
|
var canvas_height = page.height * zoom_scale;
|
||||||
}
|
|
||||||
|
var page_width = (options.zoomMode == "manual") ? page.width * scale : canvas_width;
|
||||||
// draw the page(s)
|
var page_height = (options.zoomMode == "manual") ? page.height * scale : canvas_height;
|
||||||
context.drawImage(page, offsetW, offsetH, page_width, page_height);
|
|
||||||
if (options.displayMode == "double" && typeof page2 == "object") context.drawImage(page2, page_width + offsetW, offsetH, page_width, page_height);
|
canvas_height = page_height;
|
||||||
|
|
||||||
}
|
// make sure the canvas is always at least full screen, even if the page is more narrow than the screen
|
||||||
|
canvas.width = (canvas_width < window.innerWidth) ? window.innerWidth : canvas_width;
|
||||||
/**
|
canvas.height = (canvas_height < window.innerHeight) ? window.innerHeight : canvas_height;
|
||||||
* Increment the counter and draw the page in the canvas
|
|
||||||
*
|
// work out a horizonal position that will keep the pages always centred
|
||||||
* @see #drawPage
|
if (canvas_width < window.innerWidth && options.zoomMode == "manual") {
|
||||||
*/
|
offsetW = (window.innerWidth - page_width) / 2;
|
||||||
ComicBook.prototype.drawNextPage = function() {
|
if (options.displayMode == "double") { offsetW = offsetW - page_width / 2; }
|
||||||
if (pointer + 1 < pages.length) {
|
}
|
||||||
pointer++;
|
|
||||||
this.drawPage();
|
// work out a vertical position that will keep the pages always centred
|
||||||
}
|
if (canvas_height < window.innerHeight && options.zoomMode == "manual") {
|
||||||
}
|
offsetH = (window.innerHeight - page_height) / 2;
|
||||||
|
}
|
||||||
/**
|
|
||||||
* Decrement the counter and draw the page in the canvas
|
// draw the page(s)
|
||||||
*
|
context.drawImage(page, offsetW, offsetH, page_width, page_height);
|
||||||
* @see #drawPage
|
if (options.displayMode == "double" && typeof page2 == "object") { context.drawImage(page2, page_width + offsetW, offsetH, page_width, page_height); }
|
||||||
*/
|
|
||||||
ComicBook.prototype.drawPrevPage = function() {
|
};
|
||||||
if (pointer > 0) {
|
|
||||||
pointer--;
|
/**
|
||||||
this.drawPage();
|
* Increment the counter and draw the page in the canvas
|
||||||
}
|
*
|
||||||
}
|
* @see #drawPage
|
||||||
|
*/
|
||||||
ComicBook.prototype.navigation = function(e) {
|
ComicBook.prototype.drawNextPage = function () {
|
||||||
|
if (pointer + 1 < pages.length) {
|
||||||
switch (e.type) {
|
pointer++;
|
||||||
|
this.drawPage();
|
||||||
case "click":
|
}
|
||||||
switch (getCursorPosition(e)) {
|
};
|
||||||
case "left": ComicBook.prototype.drawPrevPage(); break;
|
|
||||||
case "right": ComicBook.prototype.drawNextPage(); break;
|
/**
|
||||||
}
|
* Decrement the counter and draw the page in the canvas
|
||||||
break;
|
*
|
||||||
}
|
* @see #drawPage
|
||||||
}
|
*/
|
||||||
|
ComicBook.prototype.drawPrevPage = function () {
|
||||||
/**
|
if (pointer > 0) {
|
||||||
* Figure out the cursor position relative to the canvas.
|
pointer--;
|
||||||
*
|
this.drawPage();
|
||||||
* Thanks to: Mark Pilgrim & http://diveintohtml5.org/canvas.html
|
}
|
||||||
*/
|
};
|
||||||
function getCursorPosition(e) {
|
|
||||||
|
ComicBook.prototype.navigation = function (e) {
|
||||||
var x;
|
|
||||||
|
if (e.type === "click") {
|
||||||
// check if page relative positions exist
|
switch (getCursorPosition(e)) {
|
||||||
if (e.pageX) x = e.pageX;
|
case "left": ComicBook.prototype.drawPrevPage(); break;
|
||||||
|
case "right": ComicBook.prototype.drawNextPage(); break;
|
||||||
// if not figure them out
|
}
|
||||||
else x = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
|
}
|
||||||
|
};
|
||||||
// make the position relative to the canvas
|
}
|
||||||
x -= canvas.offsetLeft;
|
|
||||||
|
var book;
|
||||||
// check if the user clicked on the left or right side
|
|
||||||
return (x <= canvas.width / 2) ? 'left' : 'right';
|
window.onload = function() {
|
||||||
}
|
|
||||||
|
var pages = [
|
||||||
/**
|
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/00.jpg",
|
||||||
* Merge two arrays. Any properties in b will replace the same properties in
|
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/01.jpg",
|
||||||
* a. New properties from b will be added to a.
|
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/02.jpg",
|
||||||
*
|
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/03.jpg",
|
||||||
* @param a {Object}
|
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/04.jpg",
|
||||||
* @param b {Object}
|
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/05.jpg",
|
||||||
*/
|
"http://dev.justforcomics.com/get/image/?f=comics/extracted/oni_whiteout_melt_1/06.jpg"
|
||||||
function merge(a, b) {
|
];
|
||||||
|
|
||||||
if (typeof b == "undefined") b = {};
|
var options = {
|
||||||
|
displayMode: "double",
|
||||||
for (prop in a) {
|
zoomMode: "fitWidth"
|
||||||
if (prop in b) continue;
|
};
|
||||||
b[prop] = a[prop];
|
|
||||||
}
|
book = new ComicBook("comic", pages, options);
|
||||||
|
book.draw();
|
||||||
return b;
|
};
|
||||||
}
|
|
||||||
}
|
window.onresize = function() {
|
||||||
|
book.draw();
|
||||||
|
};
|
||||||
|
|
|
||||||
Loading…
Add table
Add a link
Reference in a new issue