input.html

<script type="text/Javascript">
    var pixels = [];
    for (var i = 0; i < 28*28; i++) pixels[i] = 0;
    var click = 0;

    var canvas = document.querySelector("canvas");
    canvas.addEventListener("mousemove", function(e){
        if (e.buttons == 1) {
            click = 1;
            canvas.getContext("2d").fillStyle = "rgb(0,0,0)";
            canvas.getContext("2d").fillRect(e.offsetX, e.offsetY, 8, 8);
            x = Math.floor(e.offsetY * 0.2);
            y = Math.floor(e.offsetX * 0.2) + 1;
            for (var dy = 0; dy < 2; dy++){
                for (var dx = 0; dx < 2; dx++){
                    if ((x + dx < 28) && (y + dy < 28)){
                        pixels[(y+dy)+(x+dx)*28] = 1;
                    }
                }
            }
        } else {
            if (click == 1) set_value();
            click = 0;
        }
    });
    function clear_value(){
        canvas.getContext("2d").fillStyle = "rgb(255,255,255)";
        canvas.getContext("2d").fillRect(0, 0, 140, 140);
        for (var i = 0; i < 28*28; i++) pixels[i] = 0;
    }
    
    function set_value(){
        var result = "[["
        for (var i = 0; i < 28; i++) {
            result += "["
            for (var j = 0; j < 28; j++) {
                result += pixels [i * 28 + j]
                if (j < 27) {
                    result += ", "
                }
            }
            result += "]"
            if (i < 27) {
                result += ", "
            }
        }
        result += "]]"
        var kernel = IPython.notebook.kernel;
        kernel.execute("data = " + result)
    }
</script>
<table>
<td style="border-style: none;">
<div style="border: solid 2px #666; width: 143px; height: 144px;">
<canvas width="140" height="140"></canvas>
</div></td>
<td style="border-style: none;">
<button onclick="clear_value()">Clear</button>
</td>
</table>

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