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logo2-failedexperiment-noformwrapper.html
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logo2-failedexperiment-noformwrapper.html
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<!doctype html>
<html><head><title>HTML 5 Logo test</title></head>
<script>
<!--
function error()
{
alert("But the future refused to change...");
return true;
}
// window.onerror=function(){error()};
function process()
{
var cmd = document.elements["cmd"].value;
// Need to see if we need to scrub this
histadd(cmd);
drawit(cmd);
return;
try
{ // Hoping the try block will limit scope of a failure
// drawrandradial(cmd);
drawit(cmd);
}
catch(error)
{
}
}
function histadd(histline)
{
var histlist = document.getElementById("history");
var newhistelement = document.createElement("LI");
newhistelement.innerHTML = histline;
histlist.appendChild(newhistelement);
}
function histaddcolour(histline, colour)
{
histadd("<span style=\"color:".concat(colour).concat(";\">").concat(histline).concat("</span>"));
}
function histerror(histline)
{
histaddcolour(histline, "red");
}
function histstatus(histline)
{
histaddcolour(histline, "green");
}
function clean()
{ // We back out of a form submit partway through, and so need some cleanup.
document.elements["cmd"].value = "";
}
// -------------------------------------------------------
// Drawing code
var posx = 200; // Yes, probably should not hardcode this.
var posy = 200; // ok for a proof of concept though.
var pen_on = true;
var angledegree = 0;
// commands:
// pen_off
// pen_on
// move [distance]
// rotate [degrees]
function drawit(cmd)
{ // Given a command to draw, actually manipulate the canvas accordingly
// mainly a command parser
// histadd("entered drawit()");
var cmdparts = cmd.split(" ");
if(cmdparts.length == 0)
{
histstatus("EMPTY COMMAND");
}
else if((cmdparts.length == 1) && (cmdparts[0] == "pen_off"))
{
pen_on = false;
histstatus("OK");
}
else if((cmdparts.length == 1) && (cmdparts[0] == "pen_on"))
{
pen_on = true;
histstatus("OK");
}
else if((cmdparts.length == 2) && (cmdparts[0] == "move"))
{ // This is where the real work happens
var power = parseInt(cmdparts[1]);
if(isNaN(power))
{
histerror("BADNUM");
return;
}
if(isNaN(angledegree))
{histerror("INTERNAL ERROR adeg NaN WTF");return;}
var ymot=Math.sin(angledegree*Math.PI/180);
var xmot=Math.cos(angledegree*Math.PI/180);
if(isNaN(xmot))
{histerror("INTERNAL ERROR xmot NaN");return;}
if(isNaN(ymot))
{histerror("INTERNAL ERROR ymot NaN");return;}
var newx = posx + (xmot*power);
var newy = posy + (ymot*power);
// For this we assume that if it hits the edge it slides along it
if(newx > 399) {newx = 399;}
if(newy > 399) {newy = 399;}
if(newx < 0) {newx = 0;}
if(newy < 0) {newy = 0;}
// We're ready to draw!
if(pen_on)
{
var canvas = document.getElementById("drawhere");
var cc = canvas.getContext("2d");
cc.beginPath();
cc.moveTo(posx,posy);
cc.lineTo(newx, newy);
cc.stroke();
}
// And now let's record our new position
posx = newx;
posy = newy;
histstatus("OK"); // .concat(newx).concat(",").concat(newy));
}
else if((cmdparts.length == 2) && (cmdparts[0] == "rotate"))
{
var angle = parseInt(cmdparts[1]);
if(isNaN(angle))
{
histerror("BADNUM");
return;
}
angledegree += angle;
angledegree %= 360; // Hoping JS defines modulus of
// negative numbers more consistently
// than C does
histstatus("OK");
}
else
{
histerror("SIGNOPARSE");
}
}
// -------------------------------------------------------
// Simple drawing test code below
function randint(low,high)
{ // Quick, dirty, and possibly wrong.
var scalef = high - low;
var scaled = Math.random()*scalef;
return 1 + Math.floor(scaled+low);
}
function drawrandradial(cmd)
{ // Sample function to test drawing
var canvas = document.getElementById("drawhere");
var cc = canvas.getContext("2d");
cc.beginPath();
cc.moveTo(200,200);
cc.lineTo(randint(1,400), randint(1,400));
cc.stroke();
histadd("Drawn");
}
-->
</script>
<style type="text/css">
@import url("logo1.css");
</style>
<body>
<div id="canvasandhistory">
<div id="canvaspart">
The canvas:<br />
<canvas id="drawhere" width="400" height="400">
Are canvases not enabled in your browser?
</canvas>
</div>
<div id="comhistpart">
History goes here:
<ul id="history">
</ul>
</div>
</div>
<div id="commandpart">
Commands:
<ul>
<li>pen_on</li>
<li>pen_off</li>
<li>move PIXELS</li>
<li>rotate DEGREES</li>
</ul>
Your bidding: <input type="text" name="cmd" action="process(); clean();" />
</div>
</body>
</html>