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# JavaScript template for HTMLWriter

JS_INCLUDE = """

href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css">

function isInternetExplorer() {

ua = navigator.userAgent;

/* MSIE used to detect old browsers and Trident used to newer ones*/

return ua.indexOf("MSIE ") > -1 || ua.indexOf("Trident/") > -1;

}

/* Define the Animation class */

function Animation(frames, img_id, slider_id, interval, loop_select_id){

this.img_id = img_id;

this.slider_id = slider_id;

this.loop_select_id = loop_select_id;

this.interval = interval;

this.current_frame = 0;

this.direction = 0;

this.timer = null;

this.frames = new Array(frames.length);

for (var i=0; i<frames.length; i++)

{

this.frames[i] = new Image();

this.frames[i].src = frames[i];

}

var slider = document.getElementById(this.slider_id);

slider.max = this.frames.length - 1;

if (isInternetExplorer()) {

// switch from oninput to onchange because IE <= 11 does not conform

// with W3C specification. It ignores oninput and onchange behaves

// like oninput. In contrast, Microsoft Edge behaves correctly.

slider.setAttribute('onchange', slider.getAttribute('oninput'));

slider.setAttribute('oninput', null);

}

this.set_frame(this.current_frame);

}

Animation.prototype.get_loop_state = function(){

var button_group = document[this.loop_select_id].state;

for (var i = 0; i < button_group.length; i++) {

var button = button_group[i];

if (button.checked) {

return button.value;

}

return undefined;

}

Animation.prototype.set_frame = function(frame){

this.current_frame = frame;

document.getElementById(this.img_id).src =

this.frames[this.current_frame].src;

document.getElementById(this.slider_id).value = this.current_frame;

}

Animation.prototype.next_frame = function()

{

this.set_frame(Math.min(this.frames.length - 1, this.current_frame + 1));

}

Animation.prototype.previous_frame = function()

{

this.set_frame(Math.max(0, this.current_frame - 1));

}

Animation.prototype.first_frame = function()

{

this.set_frame(0);

}

Animation.prototype.last_frame = function()

{

this.set_frame(this.frames.length - 1);

}

Animation.prototype.slower = function()

{

this.interval /= 0.7;

if(this.direction > 0){this.play_animation();}

else if(this.direction < 0){this.reverse_animation();}

}

Animation.prototype.faster = function()

{

this.interval *= 0.7;

if(this.direction > 0){this.play_animation();}

else if(this.direction < 0){this.reverse_animation();}

}

Animation.prototype.anim_step_forward = function()

{

this.current_frame += 1;

if(this.current_frame < this.frames.length){

this.set_frame(this.current_frame);

}else{

var loop_state = this.get_loop_state();

if(loop_state == "loop"){

this.first_frame();

}else if(loop_state == "reflect"){

this.last_frame();

this.reverse_animation();

}else{

this.pause_animation();

this.last_frame();

}

Animation.prototype.anim_step_reverse = function()

{

this.current_frame -= 1;

if(this.current_frame >= 0){

this.set_frame(this.current_frame);

}else{

var loop_state = this.get_loop_state();

if(loop_state == "loop"){

this.last_frame();

}else if(loop_state == "reflect"){

this.first_frame();

this.play_animation();

}else{

this.pause_animation();

this.first_frame();

}

Animation.prototype.pause_animation = function()

{

this.direction = 0;

if (this.timer){

clearInterval(this.timer);

this.timer = null;

}

Animation.prototype.play_animation = function()

{

this.pause_animation();

this.direction = 1;

var t = this;

if (!this.timer) this.timer = setInterval(function() {

t.anim_step_forward();

}, this.interval);

}

Animation.prototype.reverse_animation = function()

{

this.pause_animation();

this.direction = -1;

var t = this;

if (!this.timer) this.timer = setInterval(function() {

t.anim_step_reverse();

}, this.interval);

}

</script>

"""

# Style definitions for the HTML template

STYLE_INCLUDE = """

<style>

.animation {

display: inline-block;

text-align: center;

}

input[type=range].anim-slider {

width: 374px;

margin-left: auto;

margin-right: auto;

}

.anim-buttons {

margin: 8px 0px;

}

.anim-buttons button {

padding: 0;

width: 36px;

}

.anim-state label {

margin-right: 8px;

}

.anim-state input {

margin: 0;

vertical-align: middle;

}

</style>

"""

# HTML template for HTMLWriter

DISPLAY_TEMPLATE = """

<input id="_anim_slider{id}" type="range" class="anim-slider"

name="points" min="0" max="1" step="1" value="0"

oninput="anim{id}.set_frame(parseInt(this.value));">

</div>

<form title="Repetition mode" aria-label="Repetition mode" action="#n" name="_anim_loop_select{id}"

class="anim-state">

<input type="radio" name="state" value="once" id="_anim_radio1_{id}"

{once_checked}>

<input type="radio" name="state" value="loop" id="_anim_radio2_{id}"

{loop_checked}>

<input type="radio" name="state" value="reflect" id="_anim_radio3_{id}"

{reflect_checked}>

<label for="_anim_radio3_{id}">Reflect</label>

</form>

</div>

/* Instantiate the Animation class. */

/* The IDs given should match those used in the template above. */

(function() {{

var img_id = "_anim_img{id}";

var slider_id = "_anim_slider{id}";

var loop_select_id = "_anim_loop_select{id}";

var frames = new Array({Nframes});

{fill_frames}

/* set a timeout to make sure all the above elements are created before

the object is initialized. */

setTimeout(function() {{

anim{id} = new Animation(frames, img_id, slider_id, {interval},

loop_select_id);

}}, 0);

}})()

</script>

"""

INCLUDED_FRAMES = """

for (var i=0; i<{Nframes}; i++){{

frames[i] = "{frame_dir}/frame" + ("0000000" + i).slice(-7) +

".{frame_format}";

}}

"""

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