Surviving the Zombie Apocalypse: Dynamic SVG and Path Animation

This tutorial demonstrates building a Zombie Apocalypse Survival Predictor using SVG and JavaScript. Part 3 showed animating zombie increments; this final part adds shopping malls and rednecks for defense, and calculates survival odds. The predictor uses dynamic SVG integration and JavaScript manipulation to create and control elements.

Key improvements:

• Dynamic SVG Element Addition: Expands on Part 3 by adding JavaScript functions (newMall, newRedneck) to dynamically create and position SVG <image></image> elements representing malls and rednecks within the scene. These functions handle element creation, attribute setting (position, scale), and appending to the SVG DOM.

• Interactive Control Panel Enhancements: Completes the control panel by adding decrement buttons and updating text displays to reflect changes in zombie, mall, and redneck counts. The tickSVG function manages these updates, ensuring values stay within defined limits.

• Survival Odds Calculation: Introduces the calcOdds function, which calculates survival odds based on zombie count, redneck count, mall count, and zombie speed. This function demonstrates using JavaScript to access and interpret data from the SVG elements.

• Pointer Animation (with Browser Compatibility Check): The movePointer function updates the survival odds display and animates a pointer along a path. The supportsAnimation() function checks browser SVG animation capabilities, providing fallback functionality for non-compliant browsers. This uses animateMotion and mpath for animation where supported, and direct DOM manipulation for others.

Adding SVG Elements (Malls & Rednecks):

The code adds global arrays (malls, rednecks) to track these elements. newMall positions malls in the four corners. newRedneck places rednecks randomly within a safe zone, flipping their orientation based on their position. These functions are called via onmouseup events on the corresponding control panel buttons.

Odds Calculation and Pointer Animation:

The calcOdds function calculates survival probability using a formula incorporating zombie, redneck, and mall counts, and zombie speed. The movePointer function updates the displayed odds and animates the pointer. The animation uses a dynamically generated path (oddsPath) and checks for browser support using supportsAnimation().

This tutorial showcases advanced SVG and JavaScript techniques for creating interactive and dynamic web applications. The complete code (linked in the original article) provides a functional Zombie Apocalypse Survival Predictor.

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