417 lines
8.9 KiB
HTML
417 lines
8.9 KiB
HTML
<!DOCTYPE html>
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<!-- saved from url=(0039)https://www.uv.es/raiza/jsg/lander.html -->
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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<style>
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body, * {width: 100%; margin: 0; padding: 0;overflow:hidden;}
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</style>
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</head>
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<body onresize="resizeEvent()" onload="resizeEvent()">
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<canvas id="myCanvas" width="1920" height="1009" style="margin: 0;background-color:black;border:1px solid #d3d3d3;">
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Your browser does not support the HTML5 canvas tag.</canvas>
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<script>
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const gravity = 0.001;
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const max_dx = 3;
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const max_dy = 1;
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var x = 70, y = 70, dx = 0, dy = 0, ax = 0, ay = 0, r = 0
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var canvas = document.getElementById("myCanvas");
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var ctx = canvas.getContext("2d");
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var lastDt = dt = Date.now();
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var fuel = 500;
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var time = 30000;
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var leftPressed = false;
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var upPressed = false;
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var rightPressed = false;
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var downPressed = false;
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var mountains = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0,0,0,0];
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for (i = 0; i < mountains.length; i++) { mountains[i] = 240 + Math.random()*240; }
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var flat = Math.floor(Math.random()*mountains.length);
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if (flat == mountains.length-1) flat--;
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mountains[flat] = mountains[flat+1];
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document.addEventListener('keydown', function(event) {
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if (event.keyCode == 37) { leftPressed = true; event.preventDefault(); }
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else if (event.keyCode == 38) { upPressed = true; event.preventDefault(); }
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else if (event.keyCode == 39) { rightPressed = true; event.preventDefault(); }
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else if (event.keyCode == 40) { downPressed = true; event.preventDefault(); }
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event.preventDefault();
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});
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document.addEventListener('keyup', function(event) {
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if (event.keyCode == 37) { leftPressed = false; event.preventDefault(); }
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else if (event.keyCode == 38) { upPressed = false; event.preventDefault(); }
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else if (event.keyCode == 39) { rightPressed = false; event.preventDefault(); }
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else if (event.keyCode == 40) { downPressed = false; event.preventDefault(); }
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});
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function resizeEvent() {
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canvas.width = document.body.clientWidth;
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canvas.height = window.innerHeight;
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}
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function intersects(line) {
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// determinar l'altura de la linea en la x de la nave
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// Punt inside circle:
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//(x - center_x)^2 + (y - center_y)^2 < radius^2
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}
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function render() {
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var now = Date.now();
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dt = now - lastDt;
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lastDt = now;
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time -= dt;
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if (leftPressed) {
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if (r > -90) { r-=4; }
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if (r > 0 && r <= 4) { r = 0; }
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} else if (rightPressed) {
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if (r < 90) { r+=4; }
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if (r < 0 && r >= -4) { r = 0; }
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}
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if (upPressed) {
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fuel--;
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ax = Math.sin(r*Math.PI/180)*0.01;
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ay = -Math.abs(Math.cos(r*Math.PI/180)*0.01);
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} else {
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ax = 0; ay = 0;
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}
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dx += ax;
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if (Math.abs(dx) > max_dx) { dx = Math.sign(dx) * max_dx; }
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var ndx = dx;
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if (ax == 0) {
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if (dx > 0) {dx -= 0.0001} else if (dx < 0) {dx += 0.0001;}
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if (Math.sign(dx) != Math.sign(ndx)) dx = 0;
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}
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dy += ay + gravity;
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if (Math.abs(dy) > max_dy) { dy = Math.sign(dy) * max_dy; }
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x += dx;
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y += dy;
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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ctx.strokeStyle = "#ffffff";
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ctx.beginPath();
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ctx.moveTo(0, mountains[0]);
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for (i = 1; i < mountains.length; i++) {
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ctx.lineTo(640*(i/(mountains.length-1)), mountains[i]);
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}
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ctx.stroke();
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ctx.beginPath();
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ctx.moveTo(640*(flat/(mountains.length-1)), mountains[flat]+1);
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ctx.lineTo(640*((flat+1)/(mountains.length-1)), mountains[flat+1]+1);
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ctx.moveTo(640*(flat/(mountains.length-1)), mountains[flat]+2);
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ctx.lineTo(640*((flat+1)/(mountains.length-1)), mountains[flat+1]+2);
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ctx.stroke();
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ctx.save();
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var rr = r;
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if (upPressed) {
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rr += (Math.random()-0.5)*10;
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}
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ctx.translate(x,y);
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ctx.rotate(rr*Math.PI/180);
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ctx.scale(0.75, 0.75);
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ctx.beginPath();
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ctx.moveTo(-5, 0);
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ctx.lineTo(-10, -5);
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ctx.lineTo(-10, -10);
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ctx.lineTo(-5, -15);
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ctx.lineTo(5, -15);
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ctx.lineTo(10, -10);
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ctx.lineTo(10, -5);
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ctx.lineTo(5, 0);
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ctx.lineTo(-5, 0);
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ctx.moveTo(-7.5, 0);
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ctx.lineTo(-10, 5);
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ctx.lineTo(10, 5);
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ctx.lineTo(7.5, 0);
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ctx.lineTo(-7.5, 0);
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ctx.moveTo(-10, 5);
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ctx.lineTo(-12.5, 10);
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ctx.moveTo(-11, 10);
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ctx.lineTo(-14, 10);
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ctx.moveTo(10, 5);
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ctx.lineTo(12.5, 10);
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ctx.moveTo(11, 10);
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ctx.lineTo(14, 10);
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if (upPressed) {
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ctx.moveTo(-10, 5);
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ctx.lineTo(0, 20+Math.random()*20);
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ctx.lineTo(10, 5);
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ctx.lineTo(-10, 5);
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}
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ctx.stroke();
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ctx.stroke();
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ctx.restore();
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ctx.save();
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ctx.beginPath();
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ctx.scale(1.5, 1.5);
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printText(20, 20, 'SCORE');
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printText(20, 35, 'TIME');
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printText(20, 50, 'FUEL');
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printText(250, 20, 'ALTITUDE');
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printText(250, 35, 'HORIZONTAL SPEED');
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printText(250, 50, 'VERTICAL SPEED');
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printText(70, 20, '0000');
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printText(70, 35, pad(Math.floor(time/100).toString(), 4));
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printText(70, 50, pad(fuel.toString(), 4));
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printText(370, 20, pad((640-Math.floor(y)).toString(), 3));
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printText(370, 35, pad((Math.floor(Math.abs(dx*60))).toString(), 3));
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printText(370, 50, pad((Math.floor(Math.abs(dy*60))).toString(), 3));
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if (dx != 0) printArrow(400,38,dx > 0 ? 1 : 3);
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if (dy != 0) printArrow(400,53,dy > 0 ? 2 : 0);
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ctx.stroke();
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ctx.restore();
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requestAnimationFrame(render);
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}
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render();
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function pad (str, max) {
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return str.length < max ? pad("0" + str, max) : str;
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}
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function printText(x, y, text) {
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ctx.save();
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ctx.translate(x, y);
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for (i = 0; i < text.length; i++) {
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ctx.translate(6, 0);
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printLetter(text[i]);
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}
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ctx.restore();
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}
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function printLetter(letter) {
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switch(letter) {
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case "1":
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ctx.moveTo(2,0);
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ctx.lineTo(2,6);
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break;
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case "2":
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ctx.moveTo(0,0);
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ctx.lineTo(4,0);
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ctx.lineTo(4,3);
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ctx.lineTo(0,3);
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ctx.lineTo(0,6);
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ctx.lineTo(4,6);
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break;
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case "3":
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ctx.moveTo(0,0);
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ctx.lineTo(4,0);
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ctx.lineTo(4,6);
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ctx.lineTo(0,6);
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ctx.moveTo(0,3);
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ctx.lineTo(4,3);
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break;
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case "4":
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ctx.moveTo(0,0);
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ctx.lineTo(0,3);
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ctx.lineTo(4,3);
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ctx.moveTo(4,0);
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ctx.lineTo(4,6);
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break;
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case "6":
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ctx.moveTo(0,0);
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ctx.lineTo(0,6);
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ctx.lineTo(4,6);
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ctx.lineTo(4,3);
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ctx.lineTo(0,3);
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break;
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case "7":
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ctx.moveTo(0,0);
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ctx.lineTo(4,0);
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ctx.lineTo(4,6);
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break;
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case "8":
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ctx.moveTo(0,0);
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ctx.lineTo(4,0);
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ctx.lineTo(4,6);
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ctx.lineTo(0,6);
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ctx.lineTo(0,0);
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ctx.moveTo(0,3);
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ctx.lineTo(4,3);
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break;
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case "9":
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ctx.moveTo(4,6);
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ctx.lineTo(4,0);
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ctx.lineTo(0,0);
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ctx.lineTo(0,3);
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ctx.lineTo(4,3);
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break;
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case "A":
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ctx.moveTo(0, 6);
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ctx.lineTo(0, 2);
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ctx.lineTo(2, 0);
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ctx.lineTo(4, 2);
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ctx.lineTo(4, 6);
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ctx.moveTo(0, 4);
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ctx.lineTo(4, 4);
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break;
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case "C":
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ctx.moveTo(4,0);
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ctx.lineTo(0,0);
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ctx.lineTo(0,6);
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ctx.lineTo(4,6);
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break;
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case "D":
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ctx.moveTo(0,0);
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ctx.lineTo(2,0);
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ctx.lineTo(4,2);
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ctx.lineTo(4,4);
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ctx.lineTo(2,6);
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ctx.lineTo(0,6);
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ctx.lineTo(0,0);
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break;
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case "E":
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ctx.moveTo(4,0);
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ctx.lineTo(0,0);
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ctx.lineTo(0,6);
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ctx.lineTo(4,6);
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ctx.moveTo(0,3);
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ctx.lineTo(2,3);
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break;
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case "F":
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ctx.moveTo(4,0);
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ctx.lineTo(0,0);
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ctx.lineTo(0,6);
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ctx.moveTo(0,3);
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ctx.lineTo(2,3);
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break;
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case "H":
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ctx.moveTo(0,0);
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ctx.lineTo(0,6);
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ctx.moveTo(0,3);
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ctx.lineTo(4,3);
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ctx.moveTo(4,0);
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ctx.lineTo(4,6);
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break;
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case "I":
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ctx.moveTo(0,0);
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ctx.lineTo(4,0);
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ctx.moveTo(2,0);
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ctx.lineTo(2,6);
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ctx.moveTo(0,6);
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ctx.lineTo(4,6);
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break;
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case "L":
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ctx.moveTo(0,0);
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ctx.lineTo(0,6);
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ctx.lineTo(4,6);
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break;
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case "M":
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ctx.moveTo(0,6);
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ctx.lineTo(0,0);
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ctx.lineTo(2,3);
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ctx.lineTo(4,0);
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ctx.lineTo(4,6);
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break;
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case "N":
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ctx.moveTo(0,6);
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ctx.lineTo(0,0);
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ctx.lineTo(4,6);
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ctx.lineTo(4,0);
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break;
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case "0":
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case "O":
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ctx.moveTo(0,0);
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ctx.lineTo(4,0);
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ctx.lineTo(4,6);
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ctx.lineTo(0,6);
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ctx.lineTo(0,0);
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break;
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case "P":
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ctx.moveTo(0,6);
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ctx.lineTo(0,0);
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ctx.lineTo(4,0);
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ctx.lineTo(4,3);
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ctx.lineTo(0,3);
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break;
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case "R":
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ctx.moveTo(0,6);
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ctx.lineTo(0,0);
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ctx.lineTo(4,0);
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ctx.lineTo(4,3);
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ctx.lineTo(0,3);
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ctx.lineTo(4,6);
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break;
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case "5":
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case "S":
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ctx.moveTo(4,0);
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ctx.lineTo(0,0);
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ctx.lineTo(0,3);
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ctx.lineTo(4,3);
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ctx.lineTo(4,6);
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ctx.lineTo(0,6);
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break;
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case "T":
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ctx.moveTo(0,0);
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ctx.lineTo(4,0);
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ctx.moveTo(2,0);
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ctx.lineTo(2,6);
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break;
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case "U":
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ctx.moveTo(0,0);
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ctx.lineTo(0,6);
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ctx.lineTo(4,6);
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ctx.lineTo(4,0);
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break;
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case "V":
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ctx.moveTo(0,0);
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ctx.lineTo(2,6);
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ctx.lineTo(4,0);
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break;
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case "Z":
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ctx.moveTo(0,0);
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ctx.lineTo(4,0);
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ctx.lineTo(0,6);
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ctx.lineTo(4,6);
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break;
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};
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}
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function printArrow(x, y, orientation) {
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ctx.save();
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ctx.translate(x, y);
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ctx.rotate(orientation*90*Math.PI/180);
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ctx.moveTo(0,0);
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ctx.lineTo(2,0);
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ctx.lineTo(0,-3);
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ctx.lineTo(-2,0);
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ctx.lineTo(0,0);
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ctx.lineTo(0,3);
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ctx.restore();
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}
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</script>
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</body></html> |