You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
108 lines
3.5 KiB
108 lines
3.5 KiB
// Utility functions for ordering and stacking of items
|
|
var EPSILON = 0.001; // used when checking collisions, to prevent round-off errors
|
|
|
|
/**
|
|
* Order items by their start data
|
|
* @param {Item[]} items
|
|
*/
|
|
exports.orderByStart = function(items) {
|
|
items.sort(function (a, b) {
|
|
return a.data.start - b.data.start;
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Order items by their end date. If they have no end date, their start date
|
|
* is used.
|
|
* @param {Item[]} items
|
|
*/
|
|
exports.orderByEnd = function(items) {
|
|
items.sort(function (a, b) {
|
|
var aTime = ('end' in a.data) ? a.data.end : a.data.start,
|
|
bTime = ('end' in b.data) ? b.data.end : b.data.start;
|
|
|
|
return aTime - bTime;
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Adjust vertical positions of the items such that they don't overlap each
|
|
* other.
|
|
* @param {Item[]} items
|
|
* All visible items
|
|
* @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
|
|
* Margins between items and between items and the axis.
|
|
* @param {boolean} [force=false]
|
|
* If true, all items will be repositioned. If false (default), only
|
|
* items having a top===null will be re-stacked
|
|
*/
|
|
exports.stack = function(items, margin, force) {
|
|
var i, iMax;
|
|
|
|
if (force) {
|
|
// reset top position of all items
|
|
for (i = 0, iMax = items.length; i < iMax; i++) {
|
|
items[i].top = null;
|
|
}
|
|
}
|
|
|
|
// calculate new, non-overlapping positions
|
|
for (i = 0, iMax = items.length; i < iMax; i++) {
|
|
var item = items[i];
|
|
if (item.top === null) {
|
|
// initialize top position
|
|
item.top = margin.axis;
|
|
|
|
do {
|
|
// TODO: optimize checking for overlap. when there is a gap without items,
|
|
// you only need to check for items from the next item on, not from zero
|
|
var collidingItem = null;
|
|
for (var j = 0, jj = items.length; j < jj; j++) {
|
|
var other = items[j];
|
|
if (other.top !== null && other !== item && other.ignoreStacking == false && exports.collision(item, other, margin.item)) {
|
|
collidingItem = other;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (collidingItem != null) {
|
|
// There is a collision. Reposition the items above the colliding element
|
|
item.top = collidingItem.top + collidingItem.height + margin.item.vertical;
|
|
}
|
|
} while (collidingItem);
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Adjust vertical positions of the items without stacking them
|
|
* @param {Item[]} items
|
|
* All visible items
|
|
* @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
|
|
* Margins between items and between items and the axis.
|
|
*/
|
|
exports.nostack = function(items, margin) {
|
|
var i, iMax;
|
|
|
|
// reset top position of all items
|
|
for (i = 0, iMax = items.length; i < iMax; i++) {
|
|
items[i].top = margin.axis;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Test if the two provided items collide
|
|
* The items must have parameters left, width, top, and height.
|
|
* @param {Item} a The first item
|
|
* @param {Item} b The second item
|
|
* @param {{horizontal: number, vertical: number}} margin
|
|
* An object containing a horizontal and vertical
|
|
* minimum required margin.
|
|
* @return {boolean} true if a and b collide, else false
|
|
*/
|
|
exports.collision = function(a, b, margin) {
|
|
return ((a.left - margin.horizontal + EPSILON) < (b.left + b.width) &&
|
|
(a.left + a.width + margin.horizontal - EPSILON) > b.left &&
|
|
(a.top - margin.vertical + EPSILON) < (b.top + b.height) &&
|
|
(a.top + a.height + margin.vertical - EPSILON) > b.top);
|
|
};
|