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/*
* js.js
* Neighbourhood Fix-It JavaScript
*
* TODO
* Investigate jQuery
* Tidy it all up
* Don't wrap around tiles as it's quite confusing if the tile server is slow to respond
* Selection of pin doesn't really need a server request, but I don't really care
*
*/
YAHOO.util.Event.onContentReady('compass', function() {
var points = this.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; };
});
YAHOO.util.Event.onContentReady('map', function() {
var dragO = new YAHOO.util.DDMap('map');
update_tiles(0, 0, false, true);
});
YAHOO.util.Event.onContentReady('mapForm', function() {
this.onsubmit = function() {
this.x.value = x + 2;
this.y.value = y + 2;
return true;
}
});
// I love the global
var tile_x = 0;
var tile_y = 0;
var tilewidth = 254;
var tileheight = 254;
function image_rotate(i, j, x, y) {
var id = 't' + i + '.' + j;
var img = document.getElementById(id);
if (x)
img.style.left = (img.offsetLeft + x*tilewidth) + 'px';
if (y)
img.style.top = (img.offsetTop + y*tileheight) + 'px';
}
var myAnim;
function pan(x, y) {
if (!myAnim || !myAnim.isAnimated()) {
update_tiles(x, y, true, false);
myAnim = new YAHOO.util.Motion('drag', { points:{by:[x,y]} }, 10, YAHOO.util.Easing.easeOut);
myAnim.useSeconds = false;
myAnim.animate();
}
}
function update_tiles(dx, dy, noMove, force) {
if (!dx && !dy && !force) return;
var old_drag_x = drag_x;
var old_drag_y = drag_y;
drag_x += dx;
drag_y += dy;
if (!noMove) {
var drag = document.getElementById('drag');
drag.style.left = drag_x + 'px';
drag.style.top = drag_y + 'px';
}
var horizontal = Math.floor(old_drag_x/tilewidth) - Math.floor(drag_x/tilewidth);
var vertical = Math.floor(old_drag_y/tileheight) - Math.floor(drag_y/tileheight);
if (!horizontal && !vertical && !force) return;
for (var j=0; j<horizontal; j++) {
for (var i=0; i<6; i++) { image_rotate(i, mod(j + tile_x, 6), 6, 0); }
}
for (var j=horizontal; j<0; j++) {
for (var i=0; i<6; i++) { image_rotate(i, mod(j + tile_x, 6), -6, 0); }
}
for (var i=0; i<vertical; i++) {
for (var j=0; j<6; j++) { image_rotate(mod(i + tile_y, 6), j, 0, 6); }
}
for (var i=vertical; i<0; i++) {
for (var j=0; j<6; j++) { image_rotate(mod(i + tile_y, 6), j, 0, -6); }
}
x += horizontal;
tile_x = mod((tile_x + horizontal), 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 = YAHOO.util.Connect.asyncRequest('GET', url, async_response);
}
var async_response = {
success: urls_loaded,
failure: urls_not_loaded
};
function urls_not_loaded(o) {
}
// Load 6x6 grid of tiles around current 2x2
function urls_loaded(o) {
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.onclick = drag_check;
var new_src = 'http://tilma.mysociety.org/tileserver/10k-full-london/' + tiles[i][j];
if (img.src != new_src) img.src = new_src;
img.name = 'tile_' + xx + '.' + 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.onclick = drag_check;
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.alt = 'Loading...';
drag.appendChild(img);
}
}
}
// Mod always to positive result
function mod(m, n) {
if (m>=0) return m % n;
return (m % n) + n;
}
/* Called every mousemove, so on first call, overwrite itself with quicker version */
function get_posn(ev) {
var posx, posy;
if (ev.pageX || ev.pageY) {
get_posn = function(e) {
return { x: e.pageX, y: e.pageY };
};
} else if (ev.clientX || ev.clientY) {
get_posn = function(e) {
return {
x: e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft,
y: e.clientY + document.body.scrollTop + document.documentElement.scrollTop
};
};
} else {
get_posn = function(e) {
return { x: undef, y: undef };
};
}
return get_posn(ev);
}
function setCursor(s) {
var drag = document.getElementById('drag');
var inputs = drag.getElementsByTagName('input');
for (var i=0; i<inputs.length; i++) {
inputs[i].style.cursor = s;
}
}
var in_drag = false;
function drag_check(e) {
if (in_drag) {
in_drag = false;
return false;
}
return true;
}
var mouse_pos = {};
YAHOO.util.DDMap = function(id, sGroup, config) {
if (id) {
this.init(id, sGroup, config);
}
};
YAHOO.extend(YAHOO.util.DDMap, YAHOO.util.DD, {
scroll: false,
b4MouseDown: function(e) { },
b4StartDrag: function(x, y) { },
startDrag: function(x, y) {
mouse_pos = { x: x, y: y };
setCursor('move');
in_drag = true;
},
onDrag: function(e) {
var point = get_posn(e);
if (point == mouse_pos) return false;
var dx = point.x-mouse_pos.x;
var dy = point.y-mouse_pos.y;
mouse_pos = point;
update_tiles(dx, dy, false, false);
},
b4EndDrag: function(e) { },
endDrag: function(e) {
setCursor('crosshair');
},
toString: function() {
return ("DDMap " + this.id);
}
});
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