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