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/*
* js.js
* Neighbourhood Fix-It JavaScript
*
* TODO
* Get pins to disappear when they're not over the map!
* Try and put back dragging? Not sure.
* Selection of pin doesn't really need a server request, but I don't really care
*
*/
window.onload = onLoad;
// I love the global
var tile_x = 0;
var tile_y = 0;
var tilewidth = 254;
var tileheight = 254;
function onLoad() {
// var Log = new YAHOO.widget.LogReader();
var compass = document.getElementById('compass');
if (compass) {
var points = compass.getElementsByTagName('a');
points[1].onclick = function() { pan(0, tileheight); return false; };
points[3].onclick = function() { pan(tilewidth, 0); return false; };
points[4].onclick = function() { pan(-tilewidth, 0); return false; };
points[6].onclick = function() { pan(0, -tileheight); return false; };
points[0].onclick = function() { pan(tilewidth, tileheight); return false; };
points[2].onclick = function() { pan(-tilewidth, tileheight); return false; };
points[5].onclick = function() { pan(tilewidth, -tileheight); return false; };
points[7].onclick = function() { pan(-tilewidth, -tileheight); return false; };
}
var form = document.getElementById('mapForm');
if (form) {
form.onsubmit = function() {
this.x.value = x + 2;
this.y.value = y + 2;
return true;
}
var url = '/tilma/tileserver/10k-full-london/' + x + '-' + (x+5) + ',' + y + '-' + (y+5) + '/JSON';
var req = mySociety.asyncRequest(url, urls_loaded);
}
}
function image_rotate(img, x, y) {
if (x) {
img.style.left = (img.offsetLeft + x*tilewidth) + 'px';
//img.xx += x;
}
if (y) {
img.style.top = (img.offsetTop + y*tileheight) + 'px';
//img.yy += y;
}
}
var myAnim;
function pan(x, y) {
if (!myAnim || !myAnim.isAnimated()) {
update_tiles(x, y);
myAnim = new YAHOO.util.Motion('drag', { points:{by:[x,y]} }, 1, YAHOO.util.Easing.easeBoth);
myAnim.animate();
}
}
var drag_x = 0;
var drag_y = 0;
function update_tiles(dx, dy) {
drag_x += dx;
drag_y += dy;
var horizontal = 0;
var vertical = 0;
for (var i=0; i<6; i++) {
for (var j=0; j<6; j++) {
var id = 't'+i+'.'+j;
var img = document.getElementById(id);
if (drag_x + img.offsetLeft > 762) {
img.src = '/i/grey.gif';
image_rotate(img, -6, 0);
horizontal--;
} else if (drag_x + img.offsetLeft < -508) {
img.src = '/i/grey.gif';
image_rotate(img, 6, 0);
horizontal++;
}
if (drag_y + img.offsetTop > 762) {
img.src = '/i/grey.gif';
image_rotate(img, 0, -6);
vertical--;
} else if (drag_y + img.offsetTop < -508) {
img.src = '/i/grey.gif';
image_rotate(img, 0, 6);
vertical++;
}
}
}
var horizontal = floor(horizontal/6);
x += horizontal;
tile_x = mod((tile_x + horizontal), 6);
var vertical = floor(vertical/6);
y -= vertical;
tile_y = mod((tile_y + vertical), 6);
var url = '/tilma/tileserver/10k-full-london/' + x + '-' + (x+5) + ',' + y + '-' + (y+5) + '/JSON';
var req = mySociety.asyncRequest(url, urls_loaded);
}
// Load 6x6 grid of tiles around current 2x2
function urls_loaded(o) {
if (o.readyState != 4) return;
var tiles = eval(o.responseText);
var drag = document.getElementById('drag');
for (var i=0; i<6; i++) {
var ii = (i + tile_y) % 6;
for (var j=0; j<6; j++) {
var jj = (j + tile_x) % 6;
var id = 't'+ii+'.'+jj;
var xx = x+j;
var yy = y+5-i;
var img = document.getElementById(id);
if (img) {
if (!img.galleryimg) { img.galleryimg = false; }
img.src = 'http://tilma.mysociety.org/tileserver/10k-full-london/' + tiles[i][j];
img.name = 'tile_' + xx + '.' + yy;
//if (!img.xx) img.xx = xx;
//if (!img.yy) img.yy = yy;
continue;
}
img = document.createElement('input');
img.type = 'image';
img.src = 'http://tilma.mysociety.org/tileserver/10k-full-london/' + tiles[i][j];
img.name = 'tile_' + xx + '.' + yy;
img.id = id;
img.style.position = 'absolute';
img.style.width = tilewidth + 'px';
img.style.height = tileheight + 'px';
img.style.top = ((ii-2)*tileheight) + 'px';
img.style.left = ((jj-2)*tilewidth) + 'px';
img.galleryimg = false;
//img.xx = xx;
//img.yy = yy;
img.alt = 'Loading...';
drag.appendChild(img);
}
}
}
// Floor always closer to 0
function floor(n) {
if (n>=0) return Math.floor(n);
return Math.ceil(n);
}
// Mod always to positive result
function mod(m, n) {
if (m>=0) return m % n;
return (m % n) + n;
}
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