1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
| 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();
});
}); |
Animation et ordre d'ex�cution
R�pondre avec citation
.
. Moi qui avait peur de ne pas pouvoir utiliser la r�cursivit� comme ceci � cause de l'aspect non-bloquant de javascript ! N'importe quoi, �a marche super bien. J'ai corrig� le script qui tourne maintenant comme je l'ai toujours voulu. Merci pour votre aide.
Partager