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define(function () {
var grid = {};
// Add a grid overlay with lines spaced by subcellSize, for visual
// debugging. This is useful while doing the activity layout or
// while developing widgets.
grid.addGrid = function (subcellSize) {
var canvas = document.createElement('canvas');
canvas.className = "grid";
document.body.appendChild(canvas);
var updateGrid = function () {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
var ctx = canvas.getContext("2d");
ctx.strokeStyle = "#00FFFF";
var subcellsVertical = window.innerHeight / subcellSize;
for (i = 0; i < subcellsVertical; i++) {
if ((i + 1) % 5 === 0) {
ctx.lineWidth = 1;
} else {
ctx.lineWidth = 0.5;
}
ctx.beginPath();
ctx.moveTo(0, subcellSize * (i + 1));
ctx.lineTo(canvas.width, subcellSize * (i + 1));
ctx.stroke();
}
var subcellsHorizontal = window.innerWidth / subcellSize;
for (i = 0; i < subcellsHorizontal; i++) {
if ((i + 1) % 5 === 0) {
ctx.lineWidth = 1;
} else {
ctx.lineWidth = 0.5;
}
ctx.beginPath();
ctx.moveTo(subcellSize * (i + 1), 0);
ctx.lineTo(subcellSize * (i + 1), canvas.height);
ctx.stroke();
}
};
updateGrid();
window.onresize = function (event) {
updateGrid();
};
};
return grid;
});
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