After successfully setting up my drag and drop game in canvas, I decided to make my canvas responsive by adding the following code to my css file:
#canvas
{
width:100%
}
However, this adjustment caused a discrepancy in my coordinates. Now, when I click on the center of an image, it no longer works as expected. Instead, I have to click near the image in order for it to register. This issue did not occur before making my canvas responsive through CSS.
The reason for this is that the <canvas> element has a specific size defined by its width and height attributes. These values not only determine the size of the underlying Image Data Array, but also establish the coordinate system used by the <canvas>.
If you resize the <canvas> using CSS, it does not alter the coordinate system of the canvas. There are two solutions to work around this issue:
Scale the <canvas> dynamically through Javascript by setting the width and height attributes. Keep in mind that changing one of these attributes will clear the <canvas>.
Determine the final size of the <canvas> after applying CSS scaling, then adjust mouse coordinates accordingly.
I recommend opting for method 1 as it ensures the canvas maintains a sharp appearance.
In general, libraries like paper.js offer convenient solutions for handling these scenarios.
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