[英]Using linked list to store rectangles in Paper.js
我想使用链表在 Paper.js 中存储矩形。 但是,当我尝试在 canvas 中定义自己的链表 class 时,似乎出现了问题。 当我运行下面的代码时,我得到一个空白的 canvas,而我希望 canvas 的左上角有一个黄色矩形。 如果我注释掉 class 定义和最后两行,我得到黄色矩形:
class LinkedList{
constructor(){
this.head = null;
this.tail = null;
this.length = 0;
}
unshift(val){
var newSegment = new Section(val);
if(!this.head){
this.head = newSegment;
this.tail = this.head;
} else{
newSegment.next = this.head;
this.head = newSegment;
}
this.length++;
return this;
}
}
class Section{
constructor(val){
this.val = val;
this.next = null;
}
}
var rect = new Path.Rectangle(new Point(0,0), new Size(50,50);
rect.fillColor = "yellow;
rect.strokeColor = "black";
var list = new LinkedList();
list.unshift(rect);
任何解决此问题的帮助表示赞赏!
您的代码中有错别字:
var rect = new Path.Rectangle(new Point(0,0), new Size(50,50);
最后一个括号rect.fillColor = "yellow;
错过了最后的报价这是更正后的代码:
class LinkedList {
constructor() {
this.head = null;
this.tail = null;
this.length = 0;
}
unshift(val) {
var newSegment = new Section(val);
if (!this.head) {
this.head = newSegment;
this.tail = this.head;
} else {
newSegment.next = this.head;
this.head = newSegment;
}
this.length++;
return this;
}
}
class Section {
constructor(val) {
this.val = val;
this.next = null;
}
}
var rect = new Path.Rectangle(new Point(0, 0), new Size(50, 50));
rect.fillColor = 'yellow';
rect.strokeColor = 'black';
var list = new LinkedList();
list.unshift(rect);
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