JavaScript How to draw multiple paths for a moving image on canvas android draw multiple paths,d3 draw multiple paths

I´m just beginning to learn Html5 canvas, the main idea is to make an image move through multiple lines, creating paths, the total distance of the lines should be 10km, so i will be using 10 lines of 1km, using a javascript prompt, the user will say how many km or mts the image will advance. I think i´ll have to draw ten paths of lines, making the path of the image, but i still don´t know how to move the image through all the lines.

The following code, move the image once, with no line to follow, this is what i have so far:

$(function(){
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");

var requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) {
    window.setTimeout(callback, 1000 / 60);
};
var pathArray = []; var enx = prompt("coordenada en x");
var eny = prompt("coordenada en y");
var num1 = parseInt(enx);
var num2 = parseInt(eny);

// Coordenada inicial
pathArray.push({
x: 50,
y: 50
});
pathArray.push({
x: num1,
y: num2
 });


var polypoints = makePolyPoints(pathArray);

var width = 2;
var height = 5;
var position = 0;
var speed = 2;
animate();

var fps = 60;

function animate() {
setTimeout(function () {
    requestAnimFrame(animate);

    // calcular nueva posicion
    position += speed;
    if (position > polypoints.length - 1) {
        return;
    }
    var pt = polypoints[position];


    // dibujar
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    ctx.save();
    ctx.beginPath();
    ctx.translate(pt.x, pt.y);
    // Objeto de la imagen del corredor
    img = new Image();
    // url de imagen
    img.src = "img/mono_animar.png";
    ctx.drawImage(img,0,0);
    ctx.restore();

}, 1000 / fps);
}

function makePolyPoints(pathArray)
{
var points = [];

for (var i = 1; i < pathArray.length; i++) {
    var startPt = pathArray[i - 1];
    var endPt = pathArray[i];
    var dx = endPt.x - startPt.x;
    var dy = endPt.y - startPt.y;
    for (var n = 0; n <= 100; n++)
    {
        var x = startPt.x + dx * n / 100;
        var y = startPt.y + dy * n / 100;
        points.push({
            x: x,
            y: y
        });
    }
}
return (points);}});

But i need something like this:

http://jsfiddle.net/ExpertSystem/qxgkc/ Except that the user will type a number from 1 to 12km in order to move the image along the path lines.

Answer:1

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