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xiangc
xiangc

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Building a 60fps Canvas Frustum Camera for 4K System Architecture Presentations

#opensource #javascript #webdev #canvas

When presenting intricate microservices, Kubernetes topologies, or distributed event buses to engineering teams, static diagrams often fail to convey runtime flows, while traditional slide decks lack the canvas zoom-and-pan context needed for architectural depth.

I built FocusFlow—an open-source, canvas-native presentation studio designed specifically for high-framerate system architecture walkthroughs.

Watch the 4K Demo

Experience the smooth 60fps camera transitions in high-res:

Architectural Core: Viewport Frustum & Smooth Interpolation

At the core of FocusFlow lies a custom Canvas 2D matrix transformation engine. Rather than relying on heavyweight 3D engines, FocusFlow computes viewport bounds directly against dynamic node bounding boxes.

export function computeTargetFrustum(targetBox: BoundingBox, viewport: ViewportSize): Matrix2D {
  const scaleX = (viewport.width * 0.8) / targetBox.width;
  const scaleY = (viewport.height * 0.8) / targetBox.height;
  const scale = Math.min(scaleX, scaleY, 2.5);
  return Matrix2D.translate(-targetBox.centerX, -targetBox.centerY).scale(scale);
}
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Key Capabilities

  1. 60fps GPU Cinematic Kinematics: Continuous affine transforms driven by viewport kinematics without aliasing or frame drops.
  2. Sobel Edge Smart Snapping: Integrated computer vision algorithm that snaps bounding boxes to card borders in <1ms.
  3. Dynamic Bezier Flow Routing: Real-time relative anchor calculations illuminating runtime traffic with animated pulses.
  4. 100% Offline Single-File HTML: Compile your entire presentation—4K image, overlays, audio narration, and player engine—into a self-contained <5MB file that opens instantly anywhere.

Try It Live & Source Code

I would love to hear feedback from the developer community on our canvas kinematics and architecture visualization workflow!

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