new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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Apache ECharts · all subjects

general

4 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

ECharts 5 core philosophy: Show, do not tell

Apache ECharts 5's core philosophy is 'Show, do not tell', which is a comprehensive upgrade of five topics and 15 features around the storytelling of visualizations. This allows charts to better tell the story behind the data and helps developers create visualizations that meet the needs of various scenarios more easily.

Dirty rectangle rendering for performance optimization

Apache ECharts 5 has new support for dirty rectangle rendering to address performance bottlenecks in large scenes with only local changes. When using the Canvas renderer, dirty rectangle rendering detects and updates only the parts of the view that have changed, rather than causing a complete redraw of the canvas. This improves rendering frame rates in special scenarios such as when the mouse frequently triggers graphical highlighting.

Line chart performance optimization for real-time data

Apache ECharts 5 deeply optimizes CPU consumption, memory usage, and initialization time for line graphs with large amounts of data. It enables real-time updates (less than 30ms per update) for millions of data, and even rendering within 1s for ten millions of data, with low memory usage and smooth tooltip interactions.

TypeScript refactoring and type support in ECharts 5

Apache ECharts 5 was developed by rewriting the code using TypeScript. This provides better and more code-compliant DTS type description files directly from the TypeScript source. For developers, if a component is introduced on-demand, the ComposeOption type method can combine a configuration item type that contains only the introduced components, bringing stricter type checking.

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