Coding⏱️ 2 min read📅 2026-06-03

How to Fix: Real mouse position in canvas

Canvas position issue when drawing with mouse

Quick Answer: The problem is likely due to the canvas's origin point. Try setting the canvas's origin point to 0, 0 by using the `transform` method or by setting the `origin-x` and `origin-y` CSS properties.

📋 Table of Contents

  1. 🔧 Proven Troubleshooting Steps
  2. 💡 Conclusion

Real mouse position in canvas can be a challenging issue when drawing with the mouse over a HTML5 canvas. The problem often arises when the canvas is not positioned at the origin (0,0) of the coordinate system.

🔧 Proven Troubleshooting Steps

Method 1: Positioning the Canvas at Origin (0,0)

  1. Step 1: Set the canvas position to origin (0,0) using CSS.

Method 2: Using the correct coordinate system

  1. Step 1: Use the getBoundingClientRect method to get the canvas's position relative to its parent element.

💡 Conclusion

By following these steps, you should be able to draw accurately on your canvas without any issues related to the real mouse position.

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