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/**
* @fileoverview functions used for visualizing GIS data
*
* @requires jquery
*/
/* global drawOpenLayers PASSIVE_EVENT_LISTENERS */ // templates/table/gis_visualization/gis_visualization.twig
// Constants
var zoomFactor = 1.5;
var defaultX = 0;
var defaultY = 0;
var defaultScale = 1;
// Variables
var x = defaultX;
var y = defaultY;
var scale = defaultScale;
/** @type {SVGElement|undefined} */
var gisSvg;
/** @type {ol.Map|undefined} */
var map;
/**
* Zooms and pans the visualization.
*/
function zoomAndPan () {
var g = gisSvg.getElementById('groupPanel');
if (!g) {
return;
}
$('#groupPanel', gisSvg).attr('transform', 'translate(' + x + ', ' + y + ') scale(' + scale + ')');
$('circle.vector', gisSvg).attr('r', 3 / scale);
$('circle.vector', gisSvg).attr('stroke-width', 2 / scale);
$('polyline.vector', gisSvg).attr('stroke-width', 2 / scale);
$('path.vector', gisSvg).attr('stroke-width', 0.5 / scale);
}
/**
* Initially loads either SVG or OSM visualization based on the choice.
*/
function selectVisualization () {
if ($('#choice').prop('checked') !== true) {
$('#openlayersmap').hide();
} else {
$('#placeholder').hide();
}
}
/**
* Adds necessary styles to the div that contains the openStreetMap.
*/
function styleOSM () {
var $placeholder = $('#placeholder');
var cssObj = {
'border' : '1px solid #aaa',
'width' : $placeholder.width(),
'height' : $placeholder.height(),
'float' : 'right'
};
$('#openlayersmap').css(cssObj);
}
/**
* Store a reference to the gis svg element.
*/
function storeGisSvgRef () {
gisSvg = $('#placeholder').find('svg').get(0);
}
/**
* Adds controls for zooming and panning.
*/
function addZoomPanControllers () {
if (!gisSvg) {
return;
}
var themeImagePath = $('#themeImagePath').val();
$('#placeholder').append(
// pan arrows
'<img class="button" id="left_arrow" src="' + themeImagePath + 'west-mini.png">',
'<img class="button" id="right_arrow" src="' + themeImagePath + 'east-mini.png">',
'<img class="button" id="up_arrow" src="' + themeImagePath + 'north-mini.png">',
'<img class="button" id="down_arrow" src="' + themeImagePath + 'south-mini.png">',
// zoom controls
'<img class="button" id="zoom_in" src="' + themeImagePath + 'zoom-plus-mini.png">',
'<img class="button" id="zoom_world" src="' + themeImagePath + 'zoom-world-mini.png">',
'<img class="button" id="zoom_out" src="' + themeImagePath + 'zoom-minus-mini.png">'
);
}
/**
* Resizes the GIS visualization to fit into the space available.
*/
function resizeGISVisualization () {
var $placeholder = $('#placeholder');
var oldWidth = $placeholder.width();
var visWidth = $('#div_view_options').width() - 48;
// Assign new value for width
$placeholder.width(visWidth);
$(gisSvg).attr('width', visWidth);
// Assign the offset created due to resizing to defaultX and center the svg.
defaultX = (visWidth - oldWidth) / 2;
x = defaultX;
y = defaultY;
scale = defaultScale;
}
/**
* Initialize the GIS visualization.
*/
function initGISVisualization () {
storeGisSvgRef();
// Loads either SVG or OSM visualization based on the choice
selectVisualization();
// Resizes the GIS visualization to fit into the space available
resizeGISVisualization();
if (typeof ol !== 'undefined') {
// Adds necessary styles to the div that contains the openStreetMap
styleOSM();
}
// Adds controllers for zooming and panning
addZoomPanControllers();
zoomAndPan();
}
function drawOpenLayerMap () {
$('#placeholder').hide();
$('#openlayersmap').show();
// Function doesn't work properly if #openlayersmap is hidden
if (typeof map !== 'object') {
// Draws openStreetMap with openLayers
map = drawOpenLayers();
}
}
function getRelativeCoords (e) {
var position = $('#placeholder').offset();
return {
x : e.pageX - position.left,
y : e.pageY - position.top
};
}
/**
* @param {WheelEvent} event
*/
function onGisMouseWheel (event) {
if (event.deltaY === 0) {
return;
}
event.preventDefault();
var relCoords = getRelativeCoords(event);
var factor = event.deltaY > 0 ? zoomFactor : 1 / zoomFactor;
// zoom
scale *= factor;
// zooming keeping the position under mouse pointer unmoved.
x = relCoords.x - (relCoords.x - x) * factor;
y = relCoords.y - (relCoords.y - y) * factor;
zoomAndPan();
}
/**
* Ajax handlers for GIS visualization page
*
* Actions Ajaxified here:
*
* Zooming in and zooming out on mouse wheel movement.
* Panning the visualization on dragging.
* Zooming in on double clicking.
* Zooming out on clicking the zoom out button.
* Panning on clicking the arrow buttons.
* Displaying tooltips for GIS objects.
*/
/**
* Unbind all event handlers before tearing down a page
*/
AJAX.registerTeardown('table/gis_visualization.js', function () {
$(document).off('click', '#choice');
$(document).off('dragstart', 'svg');
$(document).off('mouseup', 'svg');
$(document).off('drag', 'svg');
$(document).off('dblclick', '#placeholder');
$(document).off('click', '#zoom_in');
$(document).off('click', '#zoom_world');
$(document).off('click', '#zoom_out');
$(document).off('click', '#left_arrow');
$(document).off('click', '#right_arrow');
$(document).off('click', '#up_arrow');
$(document).off('click', '#down_arrow');
$('.vector').off('mousemove').off('mouseout');
$('#placeholder').get(0).removeEventListener(
'wheel',
onGisMouseWheel,
PASSIVE_EVENT_LISTENERS ? { passive: false } : undefined
);
if (map) {
// Removes ol.Map's resize listener from window
map.setTarget(null);
map = undefined;
}
});
AJAX.registerOnload('table/gis_visualization.js', function () {
// If we are in GIS visualization, initialize it
if ($('#gis_div').length > 0) {
initGISVisualization();
}
if ($('#choice').prop('checked') === true) {
drawOpenLayerMap();
}
if (typeof ol === 'undefined') {
$('#choice, #labelChoice').hide();
}
$(document).on('click', '#choice', function () {
if ($(this).prop('checked') === false) {
$('#placeholder').show();
$('#openlayersmap').hide();
} else {
drawOpenLayerMap();
}
});
$('#placeholder').get(0).addEventListener(
'wheel',
onGisMouseWheel,
PASSIVE_EVENT_LISTENERS ? { passive: false } : undefined
);
var dragX = 0;
var dragY = 0;
$('svg').draggable({
helper: function () {
return $('<div>');// Give a fake element to be used for dragging display
}
});
$(document).on('dragstart', 'svg', function (event, dd) {
$('#placeholder').addClass('placeholderDrag');
dragX = Math.round(dd.offset.left);
dragY = Math.round(dd.offset.top);
});
$(document).on('mouseup', 'svg', function () {
$('#placeholder').removeClass('placeholderDrag');
});
$(document).on('drag', 'svg', function (event, dd) {
var newX = Math.round(dd.offset.left);
x += newX - dragX;
dragX = newX;
var newY = Math.round(dd.offset.top);
y += newY - dragY;
dragY = newY;
zoomAndPan();
});
$(document).on('dblclick', '#placeholder', function (event) {
if (event.target.classList.contains('button')) {
return;
}
scale *= zoomFactor;
// zooming in keeping the position under mouse pointer unmoved.
var relCoords = getRelativeCoords(event);
x = relCoords.x - (relCoords.x - x) * zoomFactor;
y = relCoords.y - (relCoords.y - y) * zoomFactor;
zoomAndPan();
});
$(document).on('click', '#zoom_in', function (e) {
e.preventDefault();
// zoom in
scale *= zoomFactor;
var width = $(gisSvg).attr('width');
var height = $(gisSvg).attr('height');
// zooming in keeping the center unmoved.
x = width / 2 - (width / 2 - x) * zoomFactor;
y = height / 2 - (height / 2 - y) * zoomFactor;
zoomAndPan();
});
$(document).on('click', '#zoom_world', function (e) {
e.preventDefault();
scale = 1;
x = defaultX;
y = defaultY;
zoomAndPan();
});
$(document).on('click', '#zoom_out', function (e) {
e.preventDefault();
// zoom out
scale /= zoomFactor;
var width = $(gisSvg).attr('width');
var height = $(gisSvg).attr('height');
// zooming out keeping the center unmoved.
x = width / 2 - (width / 2 - x) / zoomFactor;
y = height / 2 - (height / 2 - y) / zoomFactor;
zoomAndPan();
});
$(document).on('click', '#left_arrow', function (e) {
e.preventDefault();
x += 100;
zoomAndPan();
});
$(document).on('click', '#right_arrow', function (e) {
e.preventDefault();
x -= 100;
zoomAndPan();
});
$(document).on('click', '#up_arrow', function (e) {
e.preventDefault();
y += 100;
zoomAndPan();
});
$(document).on('click', '#down_arrow', function (e) {
e.preventDefault();
y -= 100;
zoomAndPan();
});
/**
* Detect the mousemove event and show tooltips.
*/
$('.vector').on('mousemove', function (event) {
var contents = Functions.escapeHtml($(this).attr('name')).trim();
$('#tooltip').remove();
if (contents !== '') {
$('<div id="tooltip">' + contents + '</div>').css({
position : 'absolute',
top : event.pageY + 10,
left : event.pageX + 10,
border : '1px solid #fdd',
padding : '2px',
'background-color' : '#fee',
opacity : 0.90
}).appendTo('body').fadeIn(200);
}
});
/**
* Detect the mouseout event and hide tooltips.
*/
$('.vector').on('mouseout', function () {
$('#tooltip').remove();
});
});