Sierpinski不完整的三角形显示
我正在关注教科书代码的性质的示例7.1。 (原始代码是用java编写的,但是由于处理库在功能上与p5.js相同,因此我已经为其重写了JavaScript,以便于方便)
我相信我已经逐字复制了示例代码,但是不知何故,我最终取得了我没想到的结果。 Sierpinski的三角形中有一个不完整的部分。
我想知道我在代码中出错的地方,或者我可能会误解这类问题。
这是图像的代码
class CA {
constructor(ca_width) {
this.generation = 0;
this.w = 5;
this.cells = new Array(1050 / this.w);
this.newcells = new Array(this.cells.length);
this.ruleset = [0, 1, 0, 1, 1, 0, 1, 0]; // [1,1,0,1,1,1,1,0]//
for (let i = 0; i < this.cells.length; i++) {
this.cells[i] = 0;
}
this.cells[this.cells.length / 2] = 1;
}
generate() {
let nextgen = new Array(this.cells.length);
for (let i = 1; i < this.cells.length - 1; i++) {
let left = this.cells[i - 1];
let me = this.cells[i];
let right = this.cells[i + 1];
nextgen[i] = this.rules(left, me, right);
}
this.cells = nextgen;
this.generation++;
}
rules(a, b, c) {
let s = "" + a + b + c;
let index = parseInt(s, 2);
return this.ruleset[index];
}
display() {
for (let i = 0; i < this.cells.length; i++) {
if (this.cells[i] == 0)
fill(255);
else fill(0);
stroke(0);
rect(i * this.w, this.generation * this.w,
this.w, this.w);
}
}
}
let cA;
function setup() {
createCanvas(windowWidth, windowHeight);
cA = new CA(1000);
}
function draw() {
// createCanvas(windowWidth, 400);
// background(150);
cA.display();
cA.generate();
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.4.1/p5.js"></script>
I am following the textbook The Nature of code's Example 7.1. (The original code is written in Java, but since the processing library is functionally identical to p5.js, I have rewritten it JavaScript out of convenience)
I believe that I have copied the examples code verbatim, yet somehow I have ended up with a result which I did not expect. There is an incomplete portion in the Sierpinski's triangle which is displayed.
I would like to know where I am going wrong in my code, or what I might be misunderstanding to cause this kind of issue.
Here's the Code for the image
class CA {
constructor(ca_width) {
this.generation = 0;
this.w = 5;
this.cells = new Array(1050 / this.w);
this.newcells = new Array(this.cells.length);
this.ruleset = [0, 1, 0, 1, 1, 0, 1, 0]; // [1,1,0,1,1,1,1,0]//
for (let i = 0; i < this.cells.length; i++) {
this.cells[i] = 0;
}
this.cells[this.cells.length / 2] = 1;
}
generate() {
let nextgen = new Array(this.cells.length);
for (let i = 1; i < this.cells.length - 1; i++) {
let left = this.cells[i - 1];
let me = this.cells[i];
let right = this.cells[i + 1];
nextgen[i] = this.rules(left, me, right);
}
this.cells = nextgen;
this.generation++;
}
rules(a, b, c) {
let s = "" + a + b + c;
let index = parseInt(s, 2);
return this.ruleset[index];
}
display() {
for (let i = 0; i < this.cells.length; i++) {
if (this.cells[i] == 0)
fill(255);
else fill(0);
stroke(0);
rect(i * this.w, this.generation * this.w,
this.w, this.w);
}
}
}
let cA;
function setup() {
createCanvas(windowWidth, windowHeight);
cA = new CA(1000);
}
function draw() {
// createCanvas(windowWidth, 400);
// background(150);
cA.display();
cA.generate();
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.4.1/p5.js"></script>
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基于您计算下一代的逻辑,
this.cells [0]
andthis.cells.at(-1)
始终不确定,呈现为黑色。您可能需要将这些初始化为0,并可能使用环绕逻辑来计算其值(即cells [0] = rule(cells.ats.at(-1),单元格[0],单元格[1])< /代码>)。
我不知道您的Java代码是什么样的,但是如果您使用的是
new Int []
类型,那么它将被归零并可能按预期工作,与JS不同, array()
。通常,请谨慎使用 array() js中的构造函数。它将单元格留在了一个非初始化的状态(“空插槽”),因此您通常要链
.fill(0)
或dreak/map
它使其成为可用,您期望这样的构造函数会像Java一样发出的毫不奇怪的阵列。请记住,代码的性质为在p5.js版本中可用,并且存在从处理到p5.js的自动翻译器,例如 pde2js 。请注意,我没有尝试过PDE2J或其他翻译人员,但他们似乎值得一看。
Based on your logic for computing the next generation,
this.cells[0]
andthis.cells.at(-1)
are always undefined, which is rendered as black. You might want to initialize these to 0, and possibly use a wraparound logic for computing their value (i.e.cells[0] = rule(cells.at(-1), cells[0], cells[1])
).I don't know what your Java code looks like, but if you're using a
new int[]
type, then that'll be zeroed out and probably work as expected, unlike JSArray()
.In general, use caution with the
Array()
constructor in JS. It leaves the cells in an uninitialized state ("empty slots"), so you usually want to chain.fill(0)
or spread/map
it to make it a usable, unsurprising array that you'd expect such a constructor to emit, as it does in Java.Keep in mind that the Nature of Code is available in a p5.js version, and there exist automatic translators from Processing to p5.js, like pde2js. Note that I haven't tried pde2js or the other translators but they seem worth a look.