adding the animation directory
This commit is contained in:
Jidong Xiao
360
animations/pointers/example4/example4.js
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360
animations/pointers/example4/example4.js
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// 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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var count=0;
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// then create layer
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var layer = new Konva.Layer();
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function makeText(x,y,str,id) {
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let text = 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: 'text_'+id,
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fontSize: 18,
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fontFamily: 'Calibri',
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fill: '#000000',
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width: 400,
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padding: 20,
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// align: 'center',
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});
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layer.add(text);
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}
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function makeContent(x,y,str,id) {
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let content = 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: id,
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fontSize: 18,
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fontFamily: 'Calibri',
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fill: '#900C3F',
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width: 400,
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padding: 20,
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});
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layer.add(content);
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}
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function makeMemory(xstart,ystart,bufferSize,w,h) {
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for(let i=0;i<bufferSize;i++){
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let tr = new Konva.Rect({
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x: xstart,
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y: ystart+i*h,
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id:"brec"+i,
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stroke: '#343434',
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strokeWidth: 5,
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fill: '#ddd',
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width: w,
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height: h,
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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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});
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layer.add(tr);
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} // end of for loop
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}
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makeMemory(800,0,6,200,100);
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makeText(800+250, -20, "0x1000", "addr0");
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makeText(800+250, 80, "0x1008", "addr2");
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makeText(800+250, 180, "0x1010", "addr3");
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makeText(800+250, 280, "0x1018", "addr4");
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makeText(800+250, 380, "0x1020", "addr5");
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makeText(800+250, 480, "0x1028", "addr6");
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var rect1 = new Konva.Rect({
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x: 20,
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y: 60,
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id:"prec1",
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stroke: '#555',
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strokeWidth: 5,
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fill: '#ddd',
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width: 400,
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height: 220,
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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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var rect2 = new Konva.Rect({
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x: 20,
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y: 370,
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id:"console",
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stroke: '#555',
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strokeWidth: 5,
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fill: '#ddd',
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width: 400,
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height: 220,
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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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var memoryText = new Konva.Text({
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x: 830,
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y: 635,
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id:"memory",
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text: "Memory",
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fontSize: 28,
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fontFamily: 'Calibri',
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fill: '#000000',
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});
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var codeLabel = new Konva.Text({
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x: 150,
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y: 305,
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id:"code",
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text: "Code",
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fontSize: 28,
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fontFamily: 'Calibri',
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fill: '#000000',
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});
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var consoleLabel = new Konva.Text({
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x: 130,
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y: 635,
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id:"console",
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text: "Console",
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fontSize: 28,
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fontFamily: 'Calibri',
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fill: '#000000',
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});
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var consoleText = new Konva.Text({
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x: 60,
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y: 400,
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id:"console_text",
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text: "",
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fontSize: 28,
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fontFamily: 'Calibri',
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fill: '#581845',
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});
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var arrowLeft1 = new Konva.Arrow({
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points: [945, 350, 1100, 200, 1005, 150],
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tension: 0.5,
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pointerLength: 10,
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pointerWidth: 10,
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id: "arrowrleft1",
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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 arrowLeft2 = new Konva.Arrow({
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points: [945, 450, 1100, 300, 1005, 250],
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tension: 0.5,
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pointerLength: 10,
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pointerWidth: 10,
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id: "arrowleft2",
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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 arrowLeft3 = new Konva.Arrow({
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points: [945, 550, 1100, 400, 1005, 250],
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tension: 0.5,
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pointerLength: 10,
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pointerWidth: 10,
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id: "arrowleft2",
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fill: 'red',
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stroke: 'red',
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strokeWidth: 5,
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});
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/* for the arrow */
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var arrowarray1 = [945, 450, 1100, 300, 1005, 250];
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function moveArrow(){
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arrowarray1[5] = arrowarray1[5] - 100;
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arrowarray1[3] = arrowarray1[3] - 100;
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stage.find('#arrowleft2').points(arrowarray1);
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}
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// box for code
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layer.add(rect1);
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// box for console
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layer.add(rect2);
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layer.add(memoryText);
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layer.add(consoleLabel);
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layer.add(codeLabel);
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layer.add(consoleText);
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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: 400,
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padding: 20,
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});
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}
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// hard code here, we assume we only have 9 lines of code.
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function makeBold(id){
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for(let i=1;i<=9;i++){
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if(i!=id){
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stage.find('#line'+i).fontStyle('normal');
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}else{
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stage.find('#line'+id).fontStyle('bold');
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}
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}
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}
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var code=["1. int x = 10, y = 15;",
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"2. int *a = &x;",
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"3. cout << x << \" \" << y << endl;",
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"4. int *b = &y;",
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"5. *a = x * *b;",
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"6. cout << x << \" \" << y << endl;",
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"7. int *c = b;",
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"8. *c = 25;",
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"9. cout << x << \" \" << y << endl;",
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];
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for (let i=0;i<code.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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let t=makeCode(20,60+(i*20),code[i],i+1);
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layer.add(t);
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}
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// defining the message box
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var msg_box = new Konva.Rect({
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x: 900,
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y: 100,
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id:"message_box",
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stroke: '#ffa07a',
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strokeWidth: 5,
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fill: '#ddd',
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width: 400,
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height: 200,
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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(msg_box);
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var message=["$",
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"",
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"",
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""];
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function updateMessage(msg,i) {
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stage.find('#text_msg'+i).text(msg);
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}
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// draw that $ sign, which is a command line prompt.
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makeText(60,400,message[0],'msg0');
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// add the layer to the stage
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stage.add(layer);
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// draw the image
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layer.draw();
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var pc=1;
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function nextstep() {
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if(pc == 1){
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makeBold(pc);
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makeText(650,120,"int x",'x');
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// this has to be after makeMemory so that the memory doesn't overwrite this.
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makeContent(870,120,"10",'x_value');
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makeText(650,220,"int y",'y');
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makeContent(870,220,"15",'y_value');
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layer.draw();
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pc=pc+1;
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}else if(pc == 2){
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makeBold(pc);
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makeText(650,320,"int *a",'a');
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makeContent(870,320,"0x1008",'a_value');
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// add the arrow here.
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layer.add(arrowLeft1);
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layer.draw();
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pc=pc+1;
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}else if(pc == 3){
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makeBold(pc);
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updateMessage("$ 10 15",0);
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makeText(60,420,message[1],'msg1');
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updateMessage("$ ",1);
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makeText(60,440,message[2],'msg2');
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makeText(60,460,message[3],'msg3');
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// stage.find('#console_text').text('$ 10 15');
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layer.draw();
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pc=pc+1;
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}else if(pc == 4){
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makeBold(pc);
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makeText(650,420,"int *b",'b');
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makeContent(870,420,"0x1010",'b_value');
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// add the second arrow here.
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layer.add(arrowLeft2);
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layer.draw();
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pc=pc+1;
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}else if(pc == 5){
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makeBold(pc);
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// following pointer a to the address which is pointed to by a, and store 150 to that address.
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// why 150? because it's x * *b, and *b is y, which is 15, whereas x is 10, and 10*15=150.
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stage.find('#x_value').text('150');
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layer.draw();
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pc=pc+1;
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}else if(pc == 6){
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makeBold(pc);
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updateMessage("$ 150 15",1);
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updateMessage("$ ",2);
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// stage.find('#console_text').text('$ 150 15');
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layer.draw();
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pc=pc+1;
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}else if(pc == 7){
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makeBold(pc);
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makeText(650,520,"int *c",'c');
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makeContent(870,520,"0x1010",'c_value');
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// add the 3rd arrow here.
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layer.add(arrowLeft3);
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layer.draw();
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pc=pc+1;
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}else if(pc == 8){
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makeBold(pc);
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// following pointer c to the address which is pointed to by c, and store 25 to that address.
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// and because we assigned b to c, so b and c are now both pointing to the address 0x16, which stores the variable y.
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stage.find('#y_value').text('25');
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layer.draw();
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pc=pc+1;
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}else if(pc == 9){
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makeBold(pc);
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updateMessage("$ 150 25",2);
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updateMessage("$ ",3);
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// stage.find('#console_text').text('$ 150 25');
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layer.draw();
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pc=pc+1;
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}else if(pc == 10){
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alert("End of animation! Refresh the page if you want to re-run the animation.");
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pc=pc+1;
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}
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}
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/* vim: set ts=4: */
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18
animations/pointers/example4/index.html
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18
animations/pointers/example4/index.html
Normal file
@@ -0,0 +1,18 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Pointers: example 4</title>
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<script src="../../konva.js"></script>
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</head>
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<body>
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<h1>Pointers: example 4</h1>
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<p>This is the animation of example 4. Click the "next step" button to run the animation.</p>
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<button onclick="nextstep()">next step</button>
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<div id="container"></div>
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<script src="example4.js"></script>
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</body>
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</html>
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