function ProgressBar() {

    this.budget = 100;

    this.todo = 100;

    this.done = 100;

    this.color_done = "green";

    this.color_budget = "blue";

    this.color_todo = "#cccccc"; //  grey

    this.height = 16;

    this.middle = this.height / 2;

    this.radius = 4;

}

ProgressBar.prototype.draw_one_rect = function(ctx, pos, color, fill) {

    ctx.beginPath();

    ctx.lineWidth = 1;

    ctx.strokeStyle = color;

    if (fill) {

        ctx.fillStyle = color;

        ctx.fillRect(0, 0, pos, this.middle * 2);

    } else {

        ctx.lineWidth = 2;

        ctx.strokeStyle = "black";

        ctx.moveTo(pos, 0);

        ctx.lineTo(pos, this.middle * 2);

        ctx.stroke();

    }

};

ProgressBar.prototype.draw_one_circ = function(ctx, pos, color) {

    ctx.beginPath();

    ctx.lineWidth = 2;

    ctx.strokeStyle = color;

    ctx.moveTo(0, this.middle);

    ctx.lineTo(pos, this.middle);

    ctx.arc(pos, this.middle, this.radius, 0, Math.PI * 2, true);

    ctx.stroke();

};

ProgressBar.prototype.draw_circ = function(ctx) {

    this.draw_one_circ(ctx, this.budget, this.color_budget);

    this.draw_one_circ(ctx, this.todo, this.color_todo);

    this.draw_one_circ(ctx, this.done, this.color_done);

};

ProgressBar.prototype.draw_rect = function(ctx) {

    this.draw_one_rect(ctx, this.todo, this.color_todo, true);

    this.draw_one_rect(ctx, this.done, this.color_done, true);

    this.draw_one_rect(ctx, this.budget, this.color_budget, false);

};

function draw_progressbar(cid, done, todo, budget, color) {

    var canvas = document.getElementById(cid);

    if (canvas.getContext) {

        var ctx = canvas.getContext("2d");

        var bar = new ProgressBar();

        bar.budget = budget;

        bar.todo = todo;

        bar.done = done;

        bar.color_done = color;

        bar.draw_rect(ctx);

    }

}