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Html5 clock implementation code

Source: Internet
Author: User
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Comments: The alarm code implemented in html5. For more information, see.
The Code is as follows:
<! Doctype html>
<Html>
<Head>
<Meta charset = "UTF-8">
<Style type = "text/css">
Canvas {position: absolute; top: 0px; left: 0px ;}
</Style>
<Title> clock </title>
</Head>
<Body>
<Canvas id = "canvas" width = "200" height = "200"> </canvas>
<Canvas id = "p_canvas" width = "200" height = "200"> </canvas>
<Script type = "text/javascript">
// Obtain the Drawing Object
Var canvas = document. getElementById ('canvas ');
Var context = canvas. getContext ('2d ');

Var p_canvas = document. getElementById ('P _ canvas ');
Var p_context = p_canvas.getContext ('2d ');

Var height = 200, width = 200;
// Draw a circle
Context. beginPath ();
Context. strokeStyle = "#009999 ";
Context. arc (width/2, height/2, width/2-1, 0, Math. PI * 2, true );
Context. stroke ();
Context. closePath ();
// Draw the center point
Context. beginPath ();
Context. fillStyle = "#000 ";
Context. arc (width/2, height/2, 0, Math. PI * 2, true );
Context. fill ();
Context. closePath ();

// Draw a small scale
Var angle = 0, radius = width/2-4;
For (var I = 0; I <60; I ++ ){
Context. beginPath ();
Context. strokeStyle = "#000 ";
// Confirm the start point of the Scale
Var x = width/2 + radius * Math. cos (angle), y = height/2 + radius * Math. sin (angle );
Context. moveTo (x, y );
// This is used to point another point of the scale to the center point and give the correct angle.
// PI is 180 degrees. The correct angle is angle + 180 degrees, which is in the opposite direction.
Var temp_angle = Math. PI + angle;
Context. lineTo (x + 3 * Math. cos (temp_angle), y + 3 * Math. sin (temp_angle ));
Context. stroke ();
Context. closePath ();
Angle ++ = 6/180 * Math. PI;
}
// Large Scale
Angle = 0, radius = width/2-4;
Context. textBaseline = 'middle ';
Context. textAlign = 'center ';
Context. lineWidth = 2;
For (var I = 0; I <12; I ++ ){
Var num = I + 3> 12? I + 3-12: I + 3;
Context. beginPath ();
Context. strokeStyle = "# FFD700 ";
Var x = width/2 + radius * Math. cos (angle), y = height/2 + radius * Math. sin (angle );
Context. moveTo (x, y );
Var temp_angle = Math. PI + angle;
Context. lineTo (x + 8 * Math. cos (temp_angle), y + 8 * Math. sin (temp_angle ));
Context. stroke ();
Context. closePath ();
// Large scale text
Context. fillText (num, x + 16 * Math. cos (temp_angle), y + 16 * Math. sin (temp_angle ));
Angle ++ = 30/180 * Math. PI;
}

Function Pointer (){
Var p_type = [['# 000',], [' # ccc ',], ['red',];
Function drwePointer (type, angle ){
Type = p_type [type];
Angle = angle * Math. PI * 2-90/180 * Math. PI;
Var length = type [1];
P_context.beginPath ();
P_context.lineWidth = type [2];
P_context.strokeStyle = type [0];
P_context.moveTo (width/2, height/2 );
P_context.lineTo (width/2 + length * Math. cos (angle), height/2 + length * Math. sin (angle ));
P_context.stroke ();
P_context.closePath ();

}
SetInterval (function (){
P_context.clearRect (0, 0, height, width );
Var time = new Date ();
Var h = time. getHours ();
Var m = time. getMinutes ();
Var s = time. getSeconds ();
H = h> 12? H-12: h;
H = h + m/60;
H = h/12;
M = m/60;
S = s/60;
DrwePointer (0, s );
DrwePointer (1, m );
DrwePointer (2, h );
},500 );
}
Var p = new Pointer ();
</Script>
</Body>
</Html>

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Related Keywords:
html5 clock widget strtok implementation code c html5 canvas code generator alarm clock code javascript digital clock code php clock code zip code validation in html5
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