JavaScript Canvas Vanishes When Width is Altered

Question

JavaScript Canvas Vanishes When Width is Altered

Following the execution of this code snippet:

let canvasElement = document.getElementById("inventoryCanvas");
canvasElement.width = width2;

The code runs successfully, but I encounter an issue where the canvas disappears afterwards.

I am unable to determine the cause behind this behavior. Can anyone provide any insights?

javascript canvas

Answer 1

Answer №1

One way to tackle this issue is by implementing a technique known as double buffering. I encountered a similar issue and managed to resolve it by utilizing a hidden canvas buffer. Prior to resizing, you can duplicate your original canvas onto this buffer, adjust the size of the original canvas, and then re-draw from the buffer.

Here's a practical example showcasing this approach: http://example.com/double-buffering-demo/

var canvas = document.getElementById('canvas'),
    buffer = document.getElementById('buffer'),
    context = canvas.getContext("2d"),
    bufferContext = buffer.getContext("2d");

bufferContext.drawImage(canvas, 0, 0); // Copy canvas to hidden buffer
canvas.width = 50; // Resize canvas
context.drawImage(buffer, 0, 0); // Redraw from buffer to canvas

Answer 2

One way to tackle this issue is by implementing a technique known as double buffering. I encountered a similar issue and managed to resolve it by utilizing a hidden canvas buffer. Prior to resizing, you can duplicate your original canvas onto this buffer, adjust the size of the original canvas, and then re-draw from the buffer.

Here's a practical example showcasing this approach: http://example.com/double-buffering-demo/

var canvas = document.getElementById('canvas'),
    buffer = document.getElementById('buffer'),
    context = canvas.getContext("2d"),
    bufferContext = buffer.getContext("2d");

bufferContext.drawImage(canvas, 0, 0); // Copy canvas to hidden buffer
canvas.width = 50; // Resize canvas
context.drawImage(buffer, 0, 0); // Redraw from buffer to canvas

JavaScript Canvas Vanishes When Width is Altered

Answer №1

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