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<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="text/javascript" src="../../distrib/jsxgraphcore.js"></script>
<link rel="stylesheet" type="text/css" href="../../distrib/jsxgraph.css" />
<script type="text/javascript" src="../jquery-3.5.1.min.js"></script>
<style type="text/css">
#box {
width:500px;
height:500px;
margin: 0 4em 1em 0;
float: left;
}
</style>
</head>
<body>
<button id="clearbtn">Clear Selection</button>
<div id="box"></div>
<script type="text/javascript">
var xmin = -10;
var ymin = -10;
var xmax = 10;
var ymax = 10;
// get size of board in pixels for conversions
var width = $('#box').width();
var height = $('#box').height();
var V = [];
var E = [];
var polyPoints = [], polygon, group;
//initialize boards
JXG.Options.point.snapToGrid = true;
JXG.Options.axis.ticks.majorHeight = -1;
JXG.Options.axis.ticks.insertTicks = false;
JXG.Options.axis.ticks.ticksDistance = 1;
var board = JXG.JSXGraph.initBoard('box', {
boundingbox: [xmin, ymax,
xmax, ymin],
axis: true
});
//styles
var pointStyle = {
fillColor: 'red',
strokeColor: 'red'
}
var selectedStyle = {
fillColor: 'green',
strokeColor: 'green'
}
var highlightedStyle = {
fillColor: 'yellow',
strokeColor: 'black'
}
var rectPointStyle = {
face: 'o',
size: 2,
strokeColor: 'green',
fillColor: 'green',
fillOpacity: 0.3,
strokeOpacity: 0.3
}
var rectStyle = {
strokeWidth: 1,
borders: {strokeColor: 'green'},
strokeOpacity: .3,
fillOpacity: 0.05
}
for (var i = 0; i < 4; i++) {
V[i] = {};
}
V[0].pt = board.create('point', [0, 0]);
V[1].pt = board.create('point', [1, 3]);
V[2].pt = board.create('point', [3, 2]);
V[3].pt = board.create('point', [-2, 2]);
window.group = group = board.create('group', []);
for (var i = 0; i < 4; i++) {
JXG.addEvent(V[i].pt.rendNode, 'mousedown', function(e) {
isSelectMode = false;
}, V[i]);
V[i].pt.on('up', (function() {
isSelectMode = true;
}));
}
//selection UI
var isSelectMode = true;
var selecting = false;
function clearSelection() {
for (var i = 0; i < selectedPts.length; i++) {
selectedPts[i].pt.setAttribute(pointStyle);
}
selectedPts = [];
polyPoints = [];
board.removeObject(polygon);
group.ungroup();
}
function startSelection() {
isSelectMode = true;
}
var rectStart, rectEnd, rectCorner1, rectCorner2, rect;
var getMouseCoords = function(e) {
var cPos = board.getCoordsTopLeftCorner(e),
absPos = JXG.getPosition(e),
dx = absPos[0] - cPos[0],
dy = absPos[1] - cPos[1];
return new JXG.Coords(JXG.COORDS_BY_SCREEN, [dx, dy], board);
},
down = function(e) {
if (!isSelectMode) return;
var canCreate = true,
coords = getMouseCoords(e),
el;
clearSelection();
if (canCreate) {
rectStart = board.create('point', [coords.usrCoords[1], coords.usrCoords[2]], rectPointStyle);
rectEnd = board.create('point', [coords.usrCoords[1], coords.usrCoords[2]], rectPointStyle);
rectCorner1 = board.create('point', [rectStart.X(), function() {
return rectEnd.Y();}], rectPointStyle);
rectCorner2 = board.create('point', [function() {
return rectEnd.X();}, rectStart.Y()], rectPointStyle);
rect = board.create('polygon', [rectStart, rectCorner1, rectEnd, rectCorner2], rectStyle);
selecting = true;
}
},
move = function(e) {
if (!selecting) return;
var coords = getMouseCoords(e);
rectEnd.moveTo([coords.usrCoords[1], coords.usrCoords[2]]);
},
selectedPts = [],
up = function(e) {
if (selecting) {
var minX, maxX, minY, maxY;
if (rectStart.X() < rectEnd.X()) {
minX = rectStart.X();
maxX = rectEnd.X();
}
else {
maxX = rectStart.X();
minX = rectEnd.X();
}
if (rectStart.Y() < rectEnd.Y()) {
minY = rectStart.Y();
maxY = rectEnd.Y();
}
else {
maxY = rectStart.Y();
minY = rectEnd.Y();
}
for (var i = 0; i < V.length; i++) {
if (V[i].pt.X() >= minX && V[i].pt.X() <= maxX && V[i].pt.Y() >= minY && V[i].pt.Y() <= maxY) {
selectedPts.push(V[i]);
}
}
board.removeObject(rect);
board.removeObject(rectCorner1);
board.removeObject(rectCorner2);
board.removeObject(rectStart);
board.removeObject(rectEnd);
for (var i = 0; i < selectedPts.length; i++) {
selectedPts[i].pt.setAttribute(selectedStyle);
polyPoints.push(selectedPts[i].pt)
}
polygon = board.create('polygon', polyPoints);
group.addPoints(polyPoints);
for (i = 0; i < polygon.borders.length; i++) {
polygon.borders[i].on('down', function(e) {
isSelectMode = false;
}, polygon.borders[i]);
polygon.borders[i].on('up', function(e) {
isSelectMode = true;
}, polygon.borders[i]);
}
selecting = false;
}
};
board.addHook(down, 'mousedown');
board.addHook(move, 'mousemove');
board.addHook(up, 'mouseup');
btn = document.getElementById('clearbtn');
btn.addEventListener('click', clearSelection, false);
</script>
</body>
</html>
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