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| document.addEventListener('DOMContentLoaded', function(){
var canvas = document.getElementById('bgCanvas');
var context = canvas.getContext('2d');
var posTable;
var nbTot = 100;
var nbDrawn = 0;
canvas.width = document.body.clientWidth;
canvas.height = Math.max( window.innerHeight, document.body.clientHeight );
function initPosTable( nbTot ){
posTable = new Array(nbTot);
for (var i = nbTot - 1; i >= 0; i--) {
posTable[i] = new Array(2);
};
}
function drawHexagon( x, y, unit ){
var sin_unit = unit * Math.sin(Math.PI/6);
var cos_unit = unit * Math.cos(Math.PI/6);
context.strokeStyle = 'rgba(150,150,150,'+ (0.8 - nbDrawn/nbTot )+')';
context.shadowBlur = 10;
context.shadowColor = 'rgba(150, 150, 150, 0.2 )';
context.lineWidth = 2;
context.beginPath();
context.moveTo(x , y);
context.lineTo(x + unit , y);
context.lineTo(x + unit + sin_unit, y + cos_unit);
context.lineTo(x + unit , y + 2 * cos_unit);
context.lineTo(x , y + 2 * cos_unit);
context.lineTo(x - sin_unit , y + cos_unit);
context.lineTo(x , y);
context.stroke();
context.fillStyle = 'rgba(200,0,0,'+(1 - nbDrawn/(nbTot*1.2) )+')';
context.fill();
context.font = "12pt Calibri,Geneva,Arial";
context.fillStyle = 'rgba(0,20,20,1)';
context.fillText(""+nbDrawn, x+15, y+30);
}
function drawBrother( x, y, unit ){
//Don't draw what we can't see.
//Maybe useless. Just to be sure it stops process out of canvas boundaries.
if ( x < 0 || y < 0 || x > canvas.width || y > canvas.height ) return;
drawHexagon(x,y,unit);
posTable[nbDrawn][0] = Math.floor(x);
posTable[nbDrawn][1] = Math.floor(y);
++nbDrawn;
setTimeout(function() {
drawSomeBrothers(x, y, unit );
}, 30);
}
function checkExist(x, y){
for ( var i = 0; i < posTable.length; ++i){
//Strict position equality not match very well
if ( ( Math.abs(posTable[i][0] == Math.floor(x)))
&& ( Math.abs(posTable[i][1] == Math.floor(y))) ) {
return true;
}
}
return false;
}
function checkVisible(x, y){
return !( x < 0 || y < 0 || x > canvas.width || y > canvas.height );
}
function drawSomeBrothers(x, y, unit){
if (nbDrawn >= nbTot-1 ) return;
/*At least 2 (direct) brothers per hexagon. More compact. More beautiful.*/
for (var i = 0; i < 2; ++i ){
var nextCoo = chooseRandomBrotherToDraw(x,y,unit);
if (nextCoo[0] || nextCoo[1])
drawBrother(nextCoo[0], nextCoo[1], unit);
}
return;
}
function shuffle(o){
for(var j, x, i = o.length; i; j = Math.floor(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);
return o;
}
function chooseRandomBrotherToDraw(x,y,unit){
var randomIds = [1,2,3,4,5,6];
randomIds = shuffle(randomIds);
var sin_unit = unit * Math.sin(Math.PI/6);
var cos_unit = unit * Math.cos(Math.PI/6);
var newX = x;
var newY = y;
for ( var i = 0;
i < 6 && checkExist(newX, newY);
++i)
{
switch(randomIds[i]){
case 1: //top left
newX = x - sin_unit - unit;
newY = y - cos_unit ;
break;
case 2: //top
newX = x;
newY = y - 2 * cos_unit;
break;
case 3: //top right
newX = x + sin_unit + unit ;
newY = y - cos_unit ;
break;
case 4: //bottom right
newX = x + sin_unit + unit ;
newY = y + cos_unit ;
break;
case 5://bottom
newX = x;
newY = y + 2*cos_unit;
break;
case 6://bottom left
newX = x - sin_unit - unit;
newY = y + cos_unit;
break;
default:
newX = 0;
newY = 0;
break;
}
if (!checkVisible(newX, newY)) {newX = x; newY = y;}
};
if (checkExist(newX, newY)) {newX = 0; newY = 0;}
var nextPositionToDraw = new Array(2);
nextPositionToDraw[0] = newX;
nextPositionToDraw[1] = newY;
return nextPositionToDraw;
}
function printPos(){
for(var i = 0; i < posTable.length; ++i){
console.log(posTable[i]);
}
}
function main(){
initPosTable(nbTot);
nbDrawn = 0;
var xFirst = Math.random() * canvas.width;
var yFirst = Math.random() * canvas.height;
var unit = 40;
drawBrother(xFirst, yFirst, unit);
}
document.getElementById("trigger").addEventListener( 'mouseover', function(){
context.clearRect(0, 0, canvas.width, canvas.height);
main();
});
}); |
