360 lines
7.3 KiB
JavaScript
360 lines
7.3 KiB
JavaScript
// Author: Jidong Xiao
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// first we need to create a stage
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var stage = new Konva.Stage({
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container: 'container', // id of container <div>
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width: 2000,
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height: 1000
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});
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// then create layer
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var layer = new Konva.Layer();
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// add the layer to the stage
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stage.add(layer);
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// the rectangle which contains the list.
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var rect3 = new Konva.Rect({
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x: 250,
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y: 360,
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id:"code_rec1",
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stroke: '#555',
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strokeWidth: 5,
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fill: '#ddd',
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width: 900,
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height: 300,
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shadowColor: 'black',
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shadowBlur: 10,
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shadowOffsetX: 10,
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shadowOffsetY: 10,
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shadowOpacity: 0.2,
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cornerRadius: 10,
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});
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layer.add(rect3);
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// Create a function to draw list nodes
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function drawListNode(x, y, label, id){
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// the rectangle represents list nodes.
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let rect1 = new Konva.Rect({
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x: x,
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y: y,
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id:"list_node_rec_" + id,
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stroke: '#555',
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strokeWidth: 5,
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fill: '#ddd',
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width: 100,
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height: 50,
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});
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layer.add(rect1);
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let rect2 = new Konva.Rect({
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x: x+100,
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y: y,
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id:"list_node_pointer_rec_" + id,
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stroke: '#555',
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strokeWidth: 5,
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fill: '#ddd',
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width: 20,
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height: 50,
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});
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layer.add(rect2);
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// value
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var text = new Konva.Text({
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x: x + 45,
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y: y + 20,
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text: label,
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id: "list_node_text_" + id,
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fontSize: 20,
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fontFamily: 'Calibri',
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fill: 'black'
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});
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layer.add(text);
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var arrow = new Konva.Arrow({
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points: [x+110, y+25, x+150, y+25],
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tension: 0.5,
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pointerLength: 10,
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pointerWidth: 10,
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id: "list_arrow_" + id,
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fill: 'green',
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stroke: 'green',
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strokeWidth: 5,
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});
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layer.add(arrow);
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}
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drawListNode(300, 460, '7', 1);
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drawListNode(450, 460, '5', 2);
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drawListNode(600, 460, '8', 3);
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drawListNode(750, 460, '1', 4);
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drawListNode(900, 460, '9', 4);
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var text_null = new Konva.Text({
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x: 1055,
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y: 475,
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text: "NULL",
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id: "node_text_null",
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fontSize: 20,
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fontFamily: 'Calibri',
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fill: 'black'
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});
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layer.add(text_null);
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var text_itr = new Konva.Text({
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x: 235,
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y: 640,
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text: "itr",
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id: 'vec_itr_1',
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fontSize: 26,
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fontFamily: 'Calibri',
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fill: '#17202a'
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});
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var itr_arrow = new Konva.Arrow({
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points: [250, 625, 250, 555],
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tension: 0.5,
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pointerLength: 10,
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pointerWidth: 10,
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id: 'itr_arrow_1',
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fill: 'green',
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stroke: 'green',
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strokeWidth: 5,
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});
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var pts = itr_arrow.points();
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var text_itr2 = new Konva.Text({
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x: 235,
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y: 640,
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text: "itr2",
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id: 'vec_itr_2',
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fontSize: 26,
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fontFamily: 'Calibri',
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fill: '#17202a'
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});
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var itr2_arrow = new Konva.Arrow({
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points: [250, 625, 250, 555],
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tension: 0.5,
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pointerLength: 10,
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pointerWidth: 10,
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id: 'itr_arrow_2',
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fill: 'yellow',
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stroke: 'yellow',
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strokeWidth: 5,
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});
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var pts2 = itr2_arrow.points();
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var text_p = new Konva.Text({
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x: 495,
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y: 610,
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text: "p",
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id: 'itr_p',
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fontSize: 26,
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fontFamily: 'Calibri',
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fill: '#17202a'
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});
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var arrow_p = new Konva.Arrow({
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points: [500, 605, 500, 535],
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tension: 0.5,
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pointerLength: 10,
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pointerWidth: 10,
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id: 'arrow_p',
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fill: 'yellow',
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stroke: 'yellow',
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strokeWidth: 5,
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});
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layer.add(text_p);
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layer.add(arrow_p);
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// for pointer q
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var text_q = new Konva.Text({
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x: 645,
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y: 710,
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text: "q",
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id: 'itr_q',
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fontSize: 26,
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fontFamily: 'Calibri',
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fill: '#17202a'
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});
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var arrow_q = new Konva.Arrow({
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points: [650, 705, 650, 635],
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tension: 0.5,
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pointerLength: 10,
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pointerWidth: 10,
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id: 'arrow_q',
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fill: 'yellow',
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stroke: 'yellow',
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strokeWidth: 5,
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});
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// the code rectangle.
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var rect_list = new Konva.Rect({
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x: 250,
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y: 60,
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id:"code_rec_list",
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stroke: '#555',
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strokeWidth: 5,
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fill: '#ddd',
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width: 650,
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height: 250,
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shadowColor: 'black',
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shadowBlur: 10,
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shadowOffsetX: 10,
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shadowOffsetY: 10,
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shadowOpacity: 0.2,
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cornerRadius: 10,
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});
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layer.add(rect_list);
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function makeCode(x,y,str,id) {
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return new Konva.Text({
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x: x,
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y: y,
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text: str,
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id: 'line'+id,
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fontSize: 18,
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fontFamily: 'Calibri',
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fill: '#000000',
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width: 750,
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padding: 20,
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});
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}
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var code_list=[
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"0. Node<T> * q = new Node<T>; \t\t\t \t\t\t // create a new node",
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"1. q->value = x; \t\t\t \t\t\t \t\t\t \t\t\t // store x in this node",
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"2. q->next = p->next; \t\t\t \t\t\t // make its successor be the current successor of p",
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"3. p->next = q; \t\t\t \t\t\t \t\t\t \t\t\t // make p's successor be this new node",
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];
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function makeBold_list(id){
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for(let i=1; i<=code_list.length; i++){
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if(i!=id){
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// regarding the parentheses, we must add the two numbers first.
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stage.find('#line'+(i+100)).fontStyle('normal');
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}else{
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stage.find('#line'+(i+100)).fontStyle('bold');
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}
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}
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}
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// write the code fragment into the code box.
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for (let i=0;i<code_list.length;i++){
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// the array starts from index 0, but we want ids to be counted from index 1.
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// here we add 100 so as to differentiate from the code array.
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let t=makeCode(260,60+(i*20),code_list[i],i+1+100);
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layer.add(t);
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}
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function increment_itr1() {
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text_itr.x(text_itr.getX()+100);
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pts[0] = pts[0] + 100;
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pts[2] = pts[2] + 100;
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itr_arrow.points(pts);
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}
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function increment_itr2() {
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text_itr2.x(text_itr2.getX()+100);
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pts2[0] = pts2[0] + 100;
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pts2[2] = pts2[2] + 100;
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itr2_arrow.points(pts2);
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}
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// draw the image
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layer.draw();
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stage.add(layer);
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var targetPoints = [1010, 485, 1100, 585, 1200, 485];
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var arrow1 = new Konva.Arrow({
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points: [1010, 485, 1030, 485, 1050, 485],
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tension: 0.5,
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pointerLength: 10,
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pointerWidth: 10,
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id: "arrow1",
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fill: 'green',
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stroke: 'green',
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strokeWidth: 5,
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});
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layer.add(arrow1);
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layer.draw();
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var arrow2 = stage.find('#arrow1');
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// Create the animation
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var tween = new Konva.Tween({
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node: arrow2,
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points: targetPoints,
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duration: 2, // animation duration in seconds
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easing: Konva.Easings.Linear
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});
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var pts_p = arrow_p.points();
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function increment_p() {
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text_p.x(text_p.getX()+160);
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pts_p[0] = pts_p[0] + 160;
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pts_p[2] = pts_p[2] + 160;
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itr2_arrow.points(pts_p);
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}
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var pc2=1;
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// erase 5 from this list.
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function list_insert_nextstep() {
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if(pc2 == 1){
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makeBold_list(1);
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drawListNode(600, 560, '?', 6);
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layer.add(text_q);
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layer.add(arrow_q);
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layer.draw();
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pc2=pc2+1;
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}else if(pc2 == 2){
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makeBold_list(2);
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stage.find('#list_node_text_6').text('4');
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layer.draw();
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pc2=pc2+1;
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}else if(pc2 == 3){
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makeBold_list(3);
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targetPoints = [720, 585, 700, 550, 600, 485];
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stage.find('#list_arrow_6').points(targetPoints);
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layer.draw();
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pc2=pc2+1;
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}else if(pc2 == 4){
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makeBold_list(4);
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targetPoints = [560, 485, 565, 530, 600, 585];
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stage.find('#list_arrow_2').points(targetPoints);
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layer.draw();
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pc2=pc2+1;
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}else if(pc2 == 5){
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makeBold_list(-1);
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var shape = stage.find('#arrow_p');
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shape.to({
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opacity: 0,
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duration: 2,
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});
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shape = stage.find('#arrow_q');
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shape.to({
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opacity: 0,
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duration: 2,
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});
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shape = stage.find('#itr_p');
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shape.to({
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opacity: 0,
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duration: 2,
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});
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shape = stage.find('#itr_q');
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shape.to({
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opacity: 0,
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duration: 2,
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});
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layer.draw();
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pc2=pc2+1;
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}else if(pc2 == 6){
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alert("End of animation! Refresh the page if you want to re-run the animation.");
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layer.draw();
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pc2=pc2+1;
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}
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}
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/* vim: set ts=4: */
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