<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office">
<head>
<title>dojo.gfx: interactive analog clock</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="../../dojo.js"></script>
<script type="text/javascript">
dojo.require("dojo.gfx.*");
dojo.require("dojo.event.*");
dojo.require("dojo.html.layout");
dojo.require("dojo.html.style");
dojo.require("dojo.date.format");
var current_time = new Date();
var hour_hand = null;
var minute_hand = null;
var second_hand = null;
var hour_shadow = null;
var minute_shadow = null;
var second_shadow = null;
var center = {x: 385 / 2, y: 385 / 2};
var hour_shadow_shift = {dx: 2, dy: 2};
var minute_shadow_shift = {dx: 3, dy: 3};
var second_shadow_shift = {dx: 4, dy: 4};
var selected_hand = null;
var container = null;
var container_position = null;
var text_time = null;
var diff_time = new Date();
placeHand = function(shape, angle, shift) {
var move = {dx: center.x + (shift ? shift.dx : 0), dy: center.y + (shift ? shift.dy : 0)};
return shape.setTransform([move, dojo.gfx.matrix.rotateg(-angle)]);
};
placeHourHand = function(h, m, s) {
var angle = 30 * (h % 12 + m / 60 + s / 3600);
placeHand(hour_hand, angle);
placeHand(hour_shadow, angle, hour_shadow_shift);
};
placeMinuteHand = function(m, s) {
var angle = 6 * (m + s / 60);
placeHand(minute_hand, angle);
placeHand(minute_shadow, angle, minute_shadow_shift);
};
placeSecondHand = function(s) {
var angle = 6 * s;
placeHand(second_hand, angle);
placeHand(second_shadow, angle, second_shadow_shift);
};
reflectTime = function(time, hold_second_hand, hold_minute_hand, hold_hour_hand) {
if(!time) time = current_time;
var h = time.getHours();
var m = time.getMinutes();
var s = time.getSeconds();
if(!hold_hour_hand) placeHourHand(h, m, s);
if(!hold_minute_hand) placeMinuteHand(m, s);
if(!hold_second_hand) placeSecondHand(s);
text_time.innerHTML = dojo.date.format(
time, {selector: "timeOnly", timePattern: "h:mm:ss a"});
};
resetTime = function() {
current_time = new Date();
reflectTime();
};
tick = function() {
current_time.setSeconds(current_time.getSeconds() + 1);
reflectTime();
};
advanceTime = function() {
if(!selected_hand) {
tick();
}
};
normalizeAngle = function(angle) {
if(angle > Math.PI) {
angle -= 2 * Math.PI;
} else if(angle < -Math.PI) {
angle += 2 * Math.PI;
}
return angle;
};
calculateAngle = function(x, y, handAngle) {
try {
return normalizeAngle(Math.atan2(y - center.y, x - center.x) - handAngle);
} catch(e) {
// supress
}
return 0;
};
getSecondAngle = function(time) {
if(!time) time = current_time;
return (6 * time.getSeconds() - 90) / 180 * Math.PI;
};
getMinuteAngle = function(time) {
if(!time) time = current_time;
return (6 * (time.getMinutes() + time.getSeconds() / 60) - 90) / 180 * Math.PI;
};
getHourAngle = function(time) {
if(!time) time = current_time;
return (30 * (time.getHours() + (time.getMinutes() + time.getSeconds() / 60) / 60) - 90) / 180 * Math.PI;
};
onMouseDown = function(event) {
selected_hand = event.target;
diff_time.setTime(current_time.getTime());
dojo.event.browser.stopEvent(event);
};
onMouseMove = function(event) {
if(!selected_hand) return;
if(event.target == second_hand.getEventSource() ||
event.target == minute_hand.getEventSource() ||
event.target == hour_hand.getEventSource()) {
dojo.event.browser.stopEvent(event);
return;
}
if(selected_hand == second_hand.getEventSource() ) {
var angle = calculateAngle(
event.clientX - container_position.x,
event.clientY - container_position.y,
normalizeAngle(getSecondAngle())
);
var diff = Math.round(angle / Math.PI * 180 / 6); // in whole seconds
current_time.setSeconds(current_time.getSeconds() + Math.round(diff));
reflectTime();
} else if(selected_hand == minute_hand.getEventSource() ) {
var angle = calculateAngle(
event.clientX - container_position.x,
event.clientY - container_position.y,
normalizeAngle(getMinuteAngle(diff_time))
);
var diff = Math.round(angle / Math.PI * 180 / 6 * 60); // in whole seconds
diff_time.setTime(diff_time.getTime() + 1000 * diff);
reflectTime(diff_time, true);
} else if(selected_hand == hour_hand.getEventSource() ) {
var angle = calculateAngle(
event.clientX - container_position.x,
event.clientY - container_position.y,
normalizeAngle(getHourAngle(diff_time))
);
var diff = Math.round(angle / Math.PI * 180 / 30 * 60 * 60); // in whole seconds
diff_time.setTime(diff_time.getTime() + 1000 * diff);
reflectTime(diff_time, true, true);
} else {
return;
}
dojo.event.browser.stopEvent(event);
};
onMouseUp = function(event) {
if(selected_hand != second_hand.getEventSource()) {
current_time.setTime(diff_time.getTime());
reflectTime();
}
selected_hand = null;
dojo.event.browser.stopEvent(event);
};
makeShapes = function(){
// prerequisites
container = dojo.byId("gfx_holder");
container_position = dojo.html.abs(container);
text_time = dojo.byId("time");
var surface = dojo.gfx.createSurface(container, 385, 385);
surface.createRect({width: 385, height: 385});
surface.createImage({width: 385, height: 385, src: "images/clock_face.jpg"});
// hand shapes
var hour_hand_points = [{x: -7, y: 15}, {x: 7, y: 15}, {x: 0, y: -60}, {x: -7, y: 15}];
var minute_hand_points = [{x: -5, y: 15}, {x: 5, y: 15}, {x: 0, y: -100}, {x: -5, y: 15}];
var second_hand_points = [{x: -2, y: 15}, {x: 2, y: 15}, {x: 2, y: -105}, {x: 6, y: -105}, {x: 0, y: -116}, {x: -6, y: -105}, {x: -2, y: -105}, {x: -2, y: 15}];
// create shapes
hour_shadow = surface.createPolyline(hour_hand_points)
.setFill([0, 0, 0, 0.1])
;
hour_hand = surface.createPolyline(hour_hand_points)
.setStroke({color: "black", width: 2})
.setFill("#889")
;
minute_shadow = surface.createPolyline(minute_hand_points)
.setFill([0, 0, 0, 0.1])
;
minute_hand = surface.createPolyline(minute_hand_points)
.setStroke({color: "black", width: 2})
.setFill("#ccd")
;
second_shadow = surface.createPolyline(second_hand_points)
.setFill([0, 0, 0, 0.1])
;
second_hand = surface.createPolyline(second_hand_points)
.setStroke({color: "#800", width: 1})
.setFill("#d00")
;
dojo.html.setClass(hour_hand .getEventSource(), "movable");
dojo.html.setClass(minute_hand.getEventSource(), "movable");
dojo.html.setClass(second_hand.getEventSource(), "movable");
surface.createCircle({r: 1}).setFill("black").setTransform({dx: 192.5, dy: 192.5});
// attach events
dojo.event.connect(hour_hand .getEventSource(), "onmousedown", onMouseDown);
dojo.event.connect(minute_hand.getEventSource(), "onmousedown", onMouseDown);
dojo.event.connect(second_hand.getEventSource(), "onmousedown", onMouseDown);
dojo.event.connect(container, "onmousemove", onMouseMove);
dojo.event.connect(container, "onmouseup", onMouseUp);
dojo.event.connect(dojo.byId("reset"), "onclick", resetTime);
// start the clock
resetTime();
window.setInterval(advanceTime, 1000);
};
dojo.addOnLoad(makeShapes);
</script>
<style type="text/css">
.movable { cursor: hand; }
</style>
</head>
<body>
<h1>dojo.gfx: interactive analog clock</h1>
<p>Grab hands and set your own time.</p>
<div id="gfx_holder" style="width: 385px; height: 385px;"></div>
<p>Current time: <span id="time"></span>.</p>
<p><button id="reset">Reset</button></p>
</body>
</html>