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// current SVG file for scrubbing and playback
var svg_index = 0;
// double buffered <object>s each holding an SVG file
var backbuffer;
var frontbuffer;
// timer for animation
var svg_timer;
var is_playing = false;
function toggle_play() {
if( is_playing ) {
is_playing = false;
clearInterval(svg_timer);
document.getElementById("text_spacebar").innerHTML =
'Spacebar to play';
} else {
is_playing = true;
svg_timer = setInterval(on_tick, 100);
document.getElementById("text_spacebar").innerHTML =
'Playing (Spacebar to stop)';
function on_tick() {
if( svg_index + 1 == svg_files.length ) {
toggle_play();
} else {
go_to_svg(svg_index+1);
}
}
}
}
function toggle_quadtree() {
var quad_groups = document.getElementsByClassName("svg_quadtree")
var i;
for (i = 0; i < quad_groups.length; i++) {
if( quad_groups[i].style.display == "none" )
quad_groups[i].style.display = "block";
else
quad_groups[i].style.display = "none";
}
}
function update_slice_visibility(max_slice) {
let content = frontbuffer.contentDocument;
update_slice_visibility_for_content(content, max_slice);
}
function update_slice_visibility_for_content(content, max_slice) {
intern = document.getElementById('intern').contentDocument;
for (let slice = 0; slice != max_slice; ++slice) {
var cbox_name = "slice_toggle" + slice;
let cbox = document.getElementById(cbox_name);
if( !cbox )
continue;
let checked = cbox.checked;
if (content) { // might fail due to cross scripting -- use SimpleHTTPServer
var id = "tile_slice" + slice + "_everything";
var group = content.getElementById(id);
if (group) {
if (checked)
group.style.display = "block";
else
group.style.display = "none";
}
}
if (intern) {
var id = "invalidation_slice" + slice;
var div = intern.getElementById(id);
if (div) {
if (checked)
div.style.display = "block";
else
div.style.display = "none";
}
}
}
}
// try to block repeated keypressed from causing flickering
// when they land between go_to_svg returning and onload
// firing.
var is_loading = false;
function go_to_svg(index) {
if( index >= svg_files.length ||
index < 0 ||
is_loading ) {
return;
}
is_loading = true;
svg_index = index;
var slider = document.getElementById('frame_slider');
// won't recurse thanks to is_loading
slider.value = svg_index;
backbuffer.onload = function(){
document.getElementById("text_frame_counter").innerHTML =
svg_files[svg_index];
let content = backbuffer.contentDocument;
update_slice_visibility_for_content(content, 20);
backbuffer.style.display = '';
frontbuffer.style.display = 'none';
var t = frontbuffer;
frontbuffer = backbuffer;
backbuffer = t;
is_loading = false;
}
document.getElementById('intern').src = intern_files[svg_index];
backbuffer.setAttribute('data', svg_files[svg_index]);
// also see https://stackoverflow.com/a/29915275
}
function load() {
window.addEventListener('keypress', handle_keyboard_shortcut);
window.addEventListener('keydown', handle_keydown);
frontbuffer = document.getElementById("svg_container0");
backbuffer = document.getElementById("svg_container1");
backbuffer.style.display='none';
var slider = document.getElementById('frame_slider');
slider.oninput = function() {
if( is_playing ) {
toggle_play();
}
go_to_svg(this.value);
}
}
function handle_keyboard_shortcut(event) {
switch (event.charCode) {
case 32: // ' '
toggle_play();
break;
case 113: // 'q'
toggle_quadtree();
break;
/*
case 49: // "1" key
document.getElementById("radio1").checked = true;
show_image(1);
break;
case 50: // "2" key
document.getElementById("radio2").checked = true;
show_image(2);
break;
case 100: // "d" key
document.getElementById("differences").click();
break;
case 112: // "p" key
shift_images(-1);
break;
case 110: // "n" key
shift_images(1);
break;
*/
}
}
function handle_keydown(event) {
switch (event.keyCode) {
case 37: // left arrow
go_to_svg(svg_index-1);
event.preventDefault();
break;
case 38: // up arrow
break;
case 39: // right arrow
go_to_svg(svg_index+1);
event.preventDefault();
break;
case 40: // down arrow
break;
}
}
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