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@erkal
Last active August 29, 2015 13:57
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waitAndEval

waitAndEval

A simple mechanism for step by step illustrations.

You can use it in aa loop: waitAndEval II

See also playButton.

<!DOCTYPE html>
<meta charset="utf-8">
<title>waitAndEval</title>
<style>
#messageText{
font-size: 60px;
text-anchor: middle;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script>
// ----------------------------------------------------------------------
var width = 960,
height = 500;
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var messageText = svg.append("text")
.attr("id", "messageText")
.attr("x", width/2)
.attr("y", height/2);
var waitAndEval = newWaitAndEval();
write("this text will stay here 8 secs");
waitAndEval(function() { write("8 seconds have passed"); }, 8000);
waitAndEval(function() { write("4 more seconds have passed"); }, 4000);
waitAndEval(function() { write("2 more seconds have passed"); }, 2000);
function write (text) { messageText.attr("class", text).text(text) }
function newWaitAndEval () {
var t = 0;
return function (foo, dur) {
t += dur
setTimeout(foo, t)
};
}
</script>
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