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Untitled

a guest Jun 17th, 2019 56 Never
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1. <!DOCTYPE html>
2. <html>
4. <script type="text/javascript">
5.
6. function Uaktualnij() {
7.  //var a1= document.getElementById('a1').value;
8.  //var a2= document.getElementById('a2').value;
9.  //var b1= document.getElementById('b1').value;
10.  //var b2= document.getElementById('b2').value;
11.   var a1=1;
12.   var a2=1;
13.   var b1=1;
14.   var b2=1;
15. }
16.
17. function fun1(x) {return a1 * Math.sin(b1 * x);  }
18. function fun2(x) {return a2 * Math.cos(b2 * x);}
19.
20. function draw() {
21.  var canvas = document.getElementById("canvas");
22.  if (null==canvas || !canvas.getContext) return;
23.
24.  var axes={}, ctx=canvas.getContext("2d");
25.  axes.x0 = .5 + .5*canvas.width;  // x0 pixels from left to x=0
26.  axes.y0 = .5 + .5*canvas.height; // y0 pixels from top to y=0
27.  axes.scale = 40;                 // 40 pixels from x=0 to x=1
28.  axes.doNegativeX = true;
29.
30.  showAxes(ctx,axes);
31.  funGraph(ctx,axes,fun1,"rgb(11,153,11)",1);
32.  funGraph(ctx,axes,fun2,"rgb(66,44,255)",2);
33. }
34.
35. function funGraph (ctx,axes,func,color,thick) {
36.  var xx, yy, dx=4, x0=axes.x0, y0=axes.y0, scale=axes.scale;
37.  var iMax = Math.round((ctx.canvas.width-x0)/dx);
38.  var iMin = axes.doNegativeX ? Math.round(-x0/dx) : 0;
39.  ctx.beginPath();
40.  ctx.lineWidth = thick;
41.  ctx.strokeStyle = color;
42.
43.  for (var i=iMin;i<=iMax;i++) {
44.   xx = dx*i; yy = scale*func(xx/scale);
45.   if (i==iMin) ctx.moveTo(x0+xx,y0-yy);
46.   else         ctx.lineTo(x0+xx,y0-yy);
47.  }
48.  ctx.stroke();
49. }
50.
51. function showAxes(ctx,axes) {
52.  var x0=axes.x0, w=ctx.canvas.width;
53.  var y0=axes.y0, h=ctx.canvas.height;
54.  var xmin = axes.doNegativeX ? 0 : x0;
55.  ctx.beginPath();
56.  ctx.strokeStyle = "rgb(128,128,128)";
57.  ctx.moveTo(xmin,y0); ctx.lineTo(w,y0);  // X axis
58.  ctx.moveTo(x0,0);    ctx.lineTo(x0,h);  // Y axis
59.  ctx.stroke();
60. }
61. </script>
63. <body>
64.
65. <form id="searchform" method="get" name="searchform">
66.             <input type="number" id="a1" name="a1" />
67.             <input type="number" id="a2" name="a2" />
68.             <input type="number" id="b1" name="b1" />
69.             <input type="number" id="b2" name="b2" />
70.             <input type="submit" id="searchbutton" onclick="Uaktualnij();" value="yes" />
71.             </form>
72. <button onclick="Uaktualnij()">Update</button>
73. <button onclick="draw()">Click</button>
74. <canvas id="canvas" width="502" height="108"></canvas>
75. </body>
76. </html>
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