69 lines
2.3 KiB
JavaScript
69 lines
2.3 KiB
JavaScript
// Start colour of the pixel grid (can be changed in the preferences)
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let pixelGridColor = "#0000FF";
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// Distance between one line and another in HTML pixels
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let lineDistance = 12;
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// The grid is not visible at the beginning
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let pixelGridVisible = false;
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// Saving the canvas containing the pixel grid
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pixelGridCanvas = document.getElementById("pixel-grid");
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/** Shows or hides the pixel grid depening on its current visibility
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* (triggered by the show pixel grid button in the top menu)
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*
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*/
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function togglePixelGrid(event) {
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// Getting the button because I have to change its text
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let button = document.getElementById("toggle-pixelgrid-button");
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// Toggling the state
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pixelGridVisible = !pixelGridVisible;
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// If it was visible, I hide it
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if (pixelGridVisible) {
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button.innerHTML = "Hide pixel grid";
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pixelGridCanvas.style.display = "inline-block";
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}
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// Otherwise, I show it
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else {
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button.innerHTML = "Show pixel grid";
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pixelGridCanvas.style.display = "none";
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}
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}
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/** Fills the pixelGridCanvas with the pixelgrid
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*
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*/
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function fillPixelGrid() {
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let context = pixelGridCanvas.getContext("2d");
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let originalSize = layers[0].canvasSize;
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// The pixelGridCanvas is lineDistance times bigger so that the lines don't take 1 canvas pixel
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// (which would cover the whole canvas with the pixelGridColour), but they take 1/lineDistance canvas pixels
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pixelGridCanvas.width = originalSize[0] * lineDistance;
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pixelGridCanvas.height = originalSize[1] * lineDistance;
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// OPTIMIZABLE, could probably be a bit more elegant
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// Draw horizontal lines
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for (let i=0; i<pixelGridCanvas.width / lineDistance; i++) {
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context.strokeStyle = settings.pixelGridColour;
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context.beginPath();
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context.moveTo(i * lineDistance + 0.5, 0);
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context.lineTo(i * lineDistance + 0.5, originalSize[1] * lineDistance);
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context.stroke();
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context.closePath();
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}
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// Draw vertical lines
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for (let i=0; i<pixelGridCanvas.height / lineDistance; i++) {
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context.beginPath();
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context.moveTo(0, i * lineDistance + 0.5);
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context.lineTo(originalSize[0] * lineDistance, i * lineDistance + 0.5);
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context.stroke();
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context.closePath();
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}
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if (!pixelGridVisible) {
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pixelGridCanvas.style.display = 'none';
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}
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} |