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/*
* js.js
* Neighbourhood Fix-It JavaScript
*
* TODO
* Updating tiles from server as they rotate around, can't seem to think of this straight...
* Get pins to disappear when they're not over the map!
* Try and put back dragging, I suppose
* Selection of pin doesn't really need a server request, but I don't really care
* Add callback to tileserver JSON, so don't have to use proxy
*
*/
window.onload = onLoad;
var x, y;
var tilewidth = 254;
var tileheight = 254;
function onLoad() {
//var Log = new YAHOO.widget.LogReader();
var compass = document.getElementById('compass');
if (compass) {
var points = document.getElementById('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');
x = parseInt(form.x.value, 10) - 2; /* Bottom left corner X,Y */
y = parseInt(form.y.value, 10) - 2;
// Load 6x6 grid of tiles around current 2x2
var urls_loaded = {
success: function(o) {
var tiles = eval(o.responseText);
var drag = document.getElementById('drag');
for (var i=0; i<6; i++) {
for (var j=0; j<6; j++) {
var id = i+'.'+j;
var xx = x+j;
var yy = y+5-i;
var img = document.getElementById(id);
if (img) {
if (!img.xx) img.xx = xx;
if (!img.yy) img.yy = yy;
if (!img.galleryimg) { img.galleryimg = false; }
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 = ((i-2)*tileheight) + 'px';
img.style.left = ((j-2)*tilewidth) + 'px';
img.galleryimg = false;
img.xx = xx;
img.yy = yy;
img.alt = 'Loading...';
drag.appendChild(img);
}
}
}
}
var url = '/proxy.cgi?x=' + x + ';xm=' + (x+5) + ';y=' + y + ';ym=' + (y+5);
var req = YAHOO.util.Connect.asyncRequest('GET', url, urls_loaded, null);
}
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);
var pins = YAHOO.util.Dom.getElementsByClassName('pin', 'img', 'content');
myAnim = new YAHOO.util.Motion('drag', { points:{by:[x,y]} }, 1, YAHOO.util.Easing.easeBoth);
myAnim.animate();
for (var p in pins) {
var a = new YAHOO.util.Anim(pins[p], { right:{by:-x}, top:{by:y} }, 1, YAHOO.util.Easing.easeBoth);
a.animate();
}
}
}
var drag_x = 0;
var drag_y = 0;
function update_tiles(dx, dy) {
// XXX Ugh, so that the server gets sent the right map co-ords. Needs more thinking about!
/* var form = document.getElementById('mapForm');
form.x.value += floor(x/tilewidth);
form.y.value += floor(y/tileheight);
*/
drag_x += dx;
drag_y += dy;
var newcols = {};
for (var i=0; i<6; i++) {
for (var j=0; j<6; j++) {
var id = i+'.'+j;
var xx = x+j;
var yy = y+5-i;
var img = document.getElementById(id);
if (drag_x + img.offsetLeft > 762) {
image_rotate(img, -6, 0);
} else if (drag_x + img.offsetLeft < -508) {
image_rotate(img, 6, 0);
} else if (drag_y + img.offsetTop > 762) {
image_rotate(img, 0, -6);
} else if (drag_y + img.offsetTop < -508) {
image_rotate(img, 0, 6);
}
}
}
// XXX: Now has to fetch correct tiles from tileserver and overwrite
// correct images... Perhaps this is not right way to do it?
/*
for (j in newcols) {
var new_column = {
success: function(o) {
var tiles = eval(o.responseText);
for (var i=0; i<6; i++) {
var tile = tiles[i][0];
alert(tile);
}
}
};
var url = '/proxy.cgi?x=' + xx + ';xm=' + xx + ';y=' + y + ';ym=' + (y+5);
var req = YAHOO.util.Connect.asyncRequest('GET', url, new_column, null);
}
*/
}
// Floor always closer to 0
function floor(n) {
if (n>=0) return Math.floor(n);
else return Math.ceil(n);
}
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