August 2017
Beginner
298 pages
7h 4m
English
Content preview from JavaScript by Example
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Making a canvas responsive to show large images
If the user selects a large image (for example, an image the size of the screen), it will cause the layout to break. To prevent this from happening, we need to zoom out our canvas when large images are selected. We can zoom in or zoom out our canvas element by controlling its height and width in CSS. In the Memes class, create the following function:
resizeCanvas(canvasHeight, canvasWidth) { let height = canvasHeight; let width = canvasWidth; this.$canvas.style.height = `${height}px`; this.$canvas.style.width = `${width}px`; while(height > Math.min(1000, deviceWidth-30) && width > Math.min(1000, deviceWidth-30)) { height /= 2; width /= 2; this.$canvas.style.height = `${height}px`; this.$canvas.style.width ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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