Exercise 10 Counting Red Squares

 Video Output



<!DOCTYPE html>

<html>

<head> Big Head Count 

</head>

<body>


<h1>Time to Count The Shapes</h1>

<p> Count the Red squares on the screen </p>


<fieldset>

    <canvas id="myCanvas" width="1200" height="300" style="border:none;">

    </canvas>


    <label> How many shapes do you see? </label>

    <input type="number" id="answer"> </input>


    <!-- <button id="colors" onclick="colors()" > Colors </button> -->

    <button id="eraser" onclick="eraser()" > Next </button>

    <button id="compare" onclick="compare();eraser()" > Answer </button>


    <p> <b>    Score: </b> </p> <div id="myScore"> 0 </div>


    <p id="demo"> </p>


</fieldset>




</body>


<script type = "text/javascript">

    var score=0;

    function colors()

    {

        var canvas = document.getElementById("myCanvas");

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

        x=Math.round(Math.random()*10+1);

        for(f=1; f<=x;f++)

        {

switch(f)

            {

                case 1: c="#ff2a00"; break

                case 2: c="#ff2a00"; break

                case 3: c="#ff2a00"; break

                case 4: c="#ff2a00"; break

                case 5: c="#ff2a00"; break

                case 6: c="#ff2a00"; break

                case 7: c="#ff2a00"; break

                case 8: c="#ff2a00"; break

                case 9: c="#ff2a00"; break

                case 10: c="#ff2a00"; break

            }


            ctx.font = "20px Calibri";


            ctx.fillStyle=c;

            ctx.fillRect(10+f*100,100, 50, 50);

        }

    }


    function eraser()

    {

        var canvas = document.getElementById("myCanvas");

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

        ctx.clearRect(0,0,1200,300); 

        colors();

    }


    colors()


    function compare()

    {

        ans=document.getElementById("answer").value


        if (ans==x)    {

            score += 1;

            document.getElementById("myScore").innerHTML=score.toString()

            document.getElementById("demo").innerHTML="Hooray! You are correct! "

        }

        else {

            document.getElementById("demo").innerHTML="Sorry, you are wrong..."

        }

    }


</script>

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