Is "context.drawImage" not displaying the image on the Canvas?
Make sure your image object is fully loaded before you try to draw it on the canvas with context.drawImage. Otherwise the image will silently fail to display.
Example making sure the image is fully loaded before trying to draw it with .drawImage
Example loading multiple images before trying to draw with any of them
There are more full-functioned image loaders, but this example illustrates how to do it
The Trained canvas
When adding content from sources outside your domain, or from the local file system the canvas is marked as tainted. Attempt to access the pixel data, or convert to a dataURL will throw a security error.
This example is just a stub to entice someone with a detailed understanding elaborate.
Image cropping using canvas
This example shows a simple image cropping function that takes an image and cropping coordinates and returns the cropped image.
Scaling image to fit or fill
Scaling to fit
This means that the whole image will be visible but there may be some empty space on the sides or top and bottom if the image is not the same aspect as the canvas. The example shows the image scaled to fit. The blue on the sides is due to the fact that the image is not the same aspect as the canvas.
Scaling to fill
This means that the image is scaled so that all the canvas pixels will be covered by the image. If the image aspect is not the same as the canvas then some parts of the image will be clipped. The example shows the image scaled to fill. Note how the top and bottom of the image are no longer visible.
Example Scale to fit
Example Scale to fill
The only difference between the two functions is getting the scale. The fit uses the min fitting scale while the fill uses the max fitting scale.
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