A Pomodoro app with zero numbers can still make time feel visible: let a procedural pixel fire evolve during focus, change its behavior for breaks, and settle when a session ends. Keep the countdown as ordinary timer state behind the scenes; the fire is its visual expression, not a clock face. Tauri’s web frontend is a natural place to start: it renders HTML, CSS, and JavaScript in the platform’s webview, with Rust available when a feature needs native capabilities.
Decide what the number-free interface must communicate
Before drawing flames, define the timer’s states and the actions that move between them. Hiding digits should not leave people guessing whether they are focusing, resting, paused, or finished.
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- Idle: show that a session is ready, with a clearly labeled Start control.
- Focus: run the focus interval and use a distinct fire animation.
- Short break and long break: make each break visibly distinct from focus and from the other break, if both are supported.
- Paused: freeze or visibly quiet the animation and offer Resume.
- Complete: make the end of a phase unmistakable and offer the next relevant action.
Use labeled controls for start, pause, resume, skip, and reset as appropriate. Put the current phase and completion or pause status in text that assistive technology can read. A canvas does not automatically expose its contents to screen readers, so provide an accessible name or fallback and keep controls and state outside the bitmap.
Keep the timer and fire renderer separate
For a desktop timer and canvas animation, begin with timer state and drawing in the Tauri web frontend. Tauri hosts HTML, CSS, and JavaScript in an operating-system webview; its process model routes inter-process communication through the Rust core. The webview differs by platform: Tauri identifies WebView2 on Windows, WKWebView on macOS, and WebKitGTK on Linux. Do not assume your app renders identically everywhere; check it in the host environments you intend to support.
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Keep the countdown’s state independent of animation frames. The timer determines the current phase and whether it has ended; the renderer reads that state and draws the corresponding scene. This separation keeps animation changes from silently changing timer behavior.
Move work into Rust only when you need a native capability. Tauri commands provide a typed route for frontend calls that pass arguments and return values or errors; its event system supports asynchronous JSON messages when a looser communication pattern fits. A local countdown and canvas do not, by themselves, require native integration.
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Draw the procedural pixel fire on a small grid
Choose a compact logical grid for the flame, then draw it to a canvas whose intrinsic width and height match that grid. Enlarge the canvas with CSS while preserving its aspect ratio. MDN’s pixel-art guide documents using image-rendering: pixelated for enlarged pixel art; when scaling images through Canvas drawing operations, set imageSmoothingEnabled to false to avoid blurred edges.
One approachable fire design is to seed hot colors along the bottom rows, update cells above them from neighboring cells with controlled randomness, map each cell’s intensity to a palette, and redraw. This is an implementation choice, not a canonical fire algorithm. Adjust the grid dimensions, update frequency, random variation, and palette by looking at the result on your target displays rather than treating any particular setting as a standard.
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Keep the same renderer but vary its visual behavior by phase: for example, make focus active and energetic, breaks gentler, pause nearly still, and completion a clear transition. These are design choices, not requirements of the Pomodoro Technique. The important interaction test is whether people can recognize the state without relying on color alone or seeing a countdown.
Preserve crisp pixels across window sizes and platforms
Pixel edges depend on the relationship between the canvas’s intrinsic size, its CSS display size, browser zoom, and device-pixel ratio. MDN warns that when CSS pixels do not map to device pixels at an integer scale, pixel-art edges can look uneven. Preserving aspect ratio and disabling smoothing help, but cannot guarantee perfectly uniform blocks at every size or scaling setting.
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Test the actual app at the window sizes and operating-system display scaling settings your audience is likely to use. Check each target webview, and inspect the flame after resizing and changing zoom. If the enlarged grid looks uneven, try a different display size or logical grid rather than assuming the renderer behaves like a bundled Chromium browser.
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Use sensible timer defaults without reducing the whole method to a timer
A 25-minute focus interval followed by a five-minute break is a familiar starting configuration, not the full Pomodoro Technique. Francesco Cirillo’s official site describes a broader system that includes daily planning, interruption management, and effort estimation. His official page also cautions against reducing the method to “Work for 25 minutes, then take a break”; timed sessions are one expression of a wider approach to time.
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Offer configurable focus and break lengths, and describe the app as a timer inspired by the technique rather than as the complete method. A fire animation can make a session’s passage tangible, but it does not replace planning or the other parts of that practice.
Keep the animation considerate of battery and CPU
Do not keep redrawing a static flame when the timer is paused or the window is minimized. MDN’s performance guidance warns that constant timers and unnecessary animation can prevent a CPU from entering low-power states. Stop or reduce rendering when it is not useful, then resume the animation when the app becomes active again.
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