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Course Introduction：Use Canvas to achieve complex graphics and animation effects. 1) Implement complex graphics by drawing paths and mathematical calculations, such as drawing stars. 2) Use requestAnimationFrame to optimize animation performance and replace setInterval. 3) Meet the challenges of complex animations through state management, optimized drawing and processing user interaction.

2025-05-21 comment 0  611

Course Introduction：How to draw graphics and implement animations in HTML5 Canvas? 1. Insert tags in HTML and set id and size; 2. Get the canvas element through JavaScript and create a 2D drawing context; 3. Use fillRect, strokeRect, arc and other methods to draw shapes; 4. Use fillText to add text and drawImage to draw pictures; 5. Use clearRect to clear the canvas and combine requestAnimationFrame to achieve animation effects. Master these basic operations and start drawing and animation development using Canvas.

2025-07-10 comment 0  249

Course Introduction：The key to using requestAnimationFrame() to achieve smooth animation on HTMLCanvas is to understand its operating mechanism and cooperate with Canvas' drawing process. 1. requestAnimationFrame() is an API designed for animation by the browser. It can be synchronized with the screen refresh rate, avoid lag or tear, and is more efficient than setTimeout or setInterval; 2. The animation infrastructure includes preparing canvas elements, obtaining context, and defining the main loop function animate(), where the canvas is cleared and the next frame is requested for continuous redrawing; 3. To achieve dynamic effects, state variables, such as the coordinates of small balls, are updated in each frame, thereby forming

2025-06-22 comment 0  414

Course Introduction：The core of HTML5Canvas implementing animation is to manually clear and repaint the canvas content. The basic principle is to draw the picture in a fast and continuous manner to create dynamic effects in the human eye. The implementation steps include: 1. Set the initial state (such as position and speed); 2. Clear the canvas; 3. Update the object state; 4. Re-draw the elements; 5. Use requestAnimationFrame() to control the frame rate to continuously animation. The sample code shows a small ball moving to the right and can control direction and speed by modifying the dx value, and even achieve boundary rebound. For multiple animation objects, you can use an array to store objects and traverse updates and draws in each frame, suitable for a variety of dynamic scenes in the game.

2025-07-10 comment 0  305

Course Introduction：The elements of HTML are mainly used to draw graphics and create dynamic visual effects on web pages through JavaScript. 1. It provides a canvas, which requires JS to obtain and operate drawings; 2. It supports dynamic content such as animation, games, data visualization, etc.; 3. Common scenarios include game development, image editing, real-time audio and video processing; 4. There are limitations such as not supporting DOM operations, barrier-free issues, and performance considerations.

2025-07-16 comment 0  918

Course Elementary  13777

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82287

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13146

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24593

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27451

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.