CSS ?? ?? ?????: ???? ??
??? ????? 2D ?????? ???? ????? ??? ?????. ??? drawImage() ???? ???? ???? ?? ? ???? ????? ???? ??? ??? ? ????. ? ??? ??? ??? ?? ?? ?? ??? ????? ??? ??? ???? CSS ?? background-size:cover? ??????? ??? ? ????.
????? ? ??? ???? ? ?? ??? ?? ??? ???? ????. :
function drawImageProp(ctx, img, x, y, w, h, offsetX, offsetY) {
// Default arguments and validation
if (arguments.length === 2) {
x = y = 0;
w = ctx.canvas.width;
h = ctx.canvas.height;
}
offsetX = typeof offsetX === "number" ? offsetX : 0.5;
offsetY = typeof offsetY === "number" ? offsetY : 0.5;
// Image dimensions and aspect ratio
var iw = img.width,
ih = img.height,
r = Math.min(w / iw, h / ih),
nw = iw * r, // New proposed width
nh = ih * r, // New proposed height
cx, cy, cw, ch, ar = 1;
// Determine image scaling factor
if (nw < w) ar = w / nw;
if (Math.abs(ar - 1) < 1e-14 && nh < h) ar = h / nh; // Updated
nw *= ar;
nh *= ar;
// Calculate source rectangle
cw = iw / (nw / w);
ch = ih / (nh / h);
cx = (iw - cw) * offsetX;
cy = (ih - ch) * offsetY;
// Validate source rectangle
if (cx < 0) cx = 0;
if (cy < 0) cy = 0;
if (cw > iw) cw = iw;
if (ch > ih) ch = ih;
// Draw the image to the destination rectangle
ctx.drawImage(img, cx, cy, cw, ch, x, y, w, h);
}
? ??? ??? ?? ??? ? ????.
drawImageProp(ctx, image, 0, 0, width, height);
??? ??? ????? ?????. ??? ?? ? ?? ??. ??? offsetX ? offsetY ????? ???? ?? ???? ??? ??? ???? ??? ? ????.
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