Building Text Containers in Canvas
summary
Shows how a canvas text container is implemented end to end: identify targets with hitbox testing using pointerdown/pointerup distance to avoid click false positives, represent bindings with boundTextElementID so text follows moves/copies, implement a wordwrap algorithm that mimics browser behavior and render it in canvas, compare DOM/hybrid/canvas measurements and observe measureText is ~90% faster, and speed up layout further with character-width caching yielding roughly 85–95% improvement.
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chapters (19)
- 0:00Text containers in Canvas
- 1:52What are text containers
- 3:15Requirements for text containers
- 4:39Designing elements in Canvas
- 6:43Hitbox testing for containers
- 8:31Demo: container selection
- 13:10Attaching text to containers
- 13:52Text-container relationships
- 17:04Text as container property
- 17:47Text within container bounds
- 19:11Canvas vs DOM text wrapping
- 20:36Implementing word wrap
- 23:06Measuring text in Canvas
- 25:50DOM text measurements
- 26:34Hybrid measurements approach
- 27:58DOM vs Canvas performance
- 29:41Pure Canvas text measurements
- 31:47Performance for text wrapping
- 34:35Key takeaways
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