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melonjs/melonjs-camera-and-drawing

Control de cámara y dibujo en modo inmediato en melonJS: seguimiento de un objetivo, límites del viewport, sacudida, desvanecimiento, cámaras secundarias y dibujo de formas, líneas y degradados dentro de un draw() personalizado.

¿Qué es melonjs-camera-and-drawing?

Este skill está diseñado para desarrolladores que trabajan con el motor de juegos melonJS y necesitan controlar la cámara y realizar dibujos en modo inmediato. Permite manejar una cámara 2D principal y secundarias, incluyendo el seguimiento de un objetivo (follow), restricción de límites (setBounds), efectos de sacudida (shake), y transiciones de desvanecimiento (fadeIn/fadeOut). También cubre la conversión entre coordenadas del mundo y de la pantalla (worldToLocal, localToWorld), así como el uso de una matriz de color (colorMatrix). En el ámbito del dibujo, el skill explica cómo utilizar el renderizador (renderer.fill, renderer.stroke) para trazar formas como rectángulos, elipses, polígonos, líneas y degradados dentro de un método draw() personalizado. Incluye técnicas de recorte (clipRect) y enmascaramiento (mask), y la creación de texturas renderizadas en segundo plano con CanvasRenderTarget, así como texturas de ruido (NoiseTexture2d). Está optimizado para plataformas como Claude Code, Cursor y Codex, y se activa automáticamente cuando se detectan términos como Camera2d, viewport, follow, setBounds, entre otros. Su utilidad principal es proporcionar una guía clara y práctica para implementar efectos visuales complejos y manejo preciso de la cámara en juegos 2D.

Compatible con~Claude Code~Codex CLI~Cursor
npx skills add https://github.com/melonjs/melonJS/tree/master/packages/melonjs/skills/melonjs-camera-and-drawing
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Documentación

¿Qué hace melonjs-camera-and-drawing?

Utiliza este skill para el control de cámara y dibujo en modo inmediato en melonJS — seguir un objetivo, límites del viewport, sacudida y desvanecimiento, cámaras secundarias, y dibujar formas, líneas y degradados dentro de un draw() personalizado. Cubre la conversión de coordenadas mundo/pantalla, recorte y enmascaramiento, y horneado con CanvasRenderTarget. Se activa con: Camera2d, viewport, follow, setBounds, shake, fadeIn, fadeOut, worldToLocal, localToWorld, colorMatrix, renderer.fill, renderer.stroke, Rect, Ellipse, Polygon, Line, Gradient, clipRect, mask, CanvasRenderTarget, NoiseTexture2d.

Individual skills in this repo

This repo contains 10 individual skills — each has its own dedicated page.

melonjs/melonjs-3d

Use this skill for anything 3D or 2.5D in melonJS — Camera3d, Mesh, InstancedMesh, Sprite3d billboards, Light3d, ground shadows, glTF/GLB scenes, and depth sorting. Covers the Y-down/+Z-forward convention that is the inverse of OpenGL, the cameraClass opt-in, clip planes, and what does not work on the Canvas fallback. Triggers on: Camera3d, Mesh, InstancedMesh, Sprite3d, Light3d, billboard, glTF, glb, 3D, 2.5D, depth, cameraClass, fov, setClipPlanes, setFog, fog, distance fog, height fog, heightFalloff, transparent, transparency, alpha, blendMode, fade, castGroundShadow, lit.

melonjs/melonjs-3d-assets

Use this skill when loading 3D models into melonJS — glTF and GLB scenes, OBJ/MTL models, materials, imported lights, node animation, ground shadows and GPU instancing. Covers level.load options including the async flag, the rightHanded conversion, and exactly what the loader does and does not support. Triggers on: glTF, gltf, glb, OBJ, MTL, 3D model, getGLTF, getOBJ, getMTL, GLTFModel, GLTFScene, level.load glb, rightHanded, lightIntensityScale, castGroundShadow, shadowGroundY, EXT_mesh_gpu_instancing, KHR_lights_punctual, skinning, Blender export, 3D asset.

melonjs/melonjs-effects-and-shaders

Use this skill for post-processing effects, custom shaders, blend modes and colour grading in melonJS. Covers the built-in ShaderEffect presets, addPostEffect on renderables and cameras, writing a custom dual-language GLSL/WGSL effect, the screen_texture builtins, and why effects silently do nothing on the Canvas fallback. Triggers on: ShaderEffect, addPostEffect, removePostEffect, getPostEffect, VignetteEffect, GlowEffect, BlurEffect, PixelateEffect, ScanlineEffect, shader, GLSL, WGSL, uniform, setUniform, setTexture, setTime, blendMode, colorMatrix, screen_texture, toFrameTexture, post effect, filter.

melonjs/melonjs-loading-assets

Use this skill for loading and managing game assets in melonJS — the resource descriptor format, the full asset type list, preload versus load, retrieving loaded assets, base URLs and cross-origin settings, and the loading screen. Triggers on: loader, loader.preload, loader.load, resources, getImage, getJSON, getTMX, getGLTF, getVideo, getFont, setBaseURL, setOptions, crossOrigin, withCredentials, credentials, cookies, authenticated assets, CORS, asset, preload, LOADER_COMPLETE, loading screen, unload.

melonjs/melonjs-performance

Use this skill when a melonJS game drops frames, allocates heavily, or needs to scale to many objects. Covers object pooling, draw-call batching, atlases, baking with CanvasRenderTarget, instancing, culling and alwaysUpdate, the debug plugin, and where the real costs are. Triggers on: performance, slow, frame rate, fps, lag, pool, pool.register, pool.pull, batching, draw calls, InstancedMesh, culling, alwaysUpdate, inViewport, CanvasRenderTarget, optimise, profiling, debug plugin, memory.

melonjs/melonjs-physics

Use this skill for collision, physics bodies, movement, and spatial queries in melonJS — the built-in SAT world and the planck/matter adapters. Covers bodyDef vs Body, collision types and masks, the collision callback family and their firing rules, raycast/queryAABB/querySphere, and the behaviour differences between adapters. Triggers on: Body, bodyDef, collision, collisionType, collisionMask, onCollision, onCollisionStart, onCollisionActive, raycast, queryAABB, querySphere, PlanckAdapter, MatterAdapter, gravity, velocity, applyForce, isGrounded, SAT.

melonjs/melonjs-renderables

Use this skill when subclassing Renderable, writing a custom draw() method, handling pointer or click events on game objects, applying post effects and shaders, or controlling draw order. Covers the pos-relative draw contract, isKinematic and input, addPostEffect vs the deprecated shader property, and z-ordering. Triggers on: Renderable, extends Renderable, draw(, update(, isKinematic, pointerEvent, registerPointerEvent, onClick, addPostEffect, removePostEffect, ShaderEffect, addChild, z-order, anchorPoint, floating.

melonjs/melonjs-renderer-backends

Use this skill when a feature works on one machine and not another, when choosing or pinning a renderer, or when writing code that must degrade gracefully. Covers the WebGPU to WebGL 2 to Canvas fallback ladder, what each backend supports, capability detection, and the subsystems that warn once and then stop working on Canvas. Triggers on: video.AUTO, video.WEBGPU, video.WEBGL, video.CANVAS, renderer.type, supportsDepthBuffer, shaderLanguage, WebGPU, WebGL2, Canvas fallback, context loss, backen

melonjs/melonjs-scenes-and-state

Use this skill for scene structure and game flow in melonJS — Stage subclasses, the state manager, transitions, pausing, the update loop, timers and tweens. Covers onResetEvent versus the constructor, state.set before state.change, the camera and world lifecycle per stage, and pause-aware timing. Triggers on: Stage, state, state.set, state.change, state.transition, state.pause, onResetEvent, onDestroyEvent, onActivateEvent, onDeactivateEvent, PLAY, MENU, LOADING, update loop, GAME_UPDATE, timer, setTimeout, setInterval, Tween, freeze.

melonjs/melonjs-ui-and-text

Use this skill for HUDs, buttons, menus, dialogue panels and on-screen text in melonJS. Covers UIBaseElement/UISpriteElement/UITextButton, Draggable and DropTarget, the floating screen-space container pattern, Text and BitmapText, web font loading, and NineSliceSprite panels. Triggers on: UI, HUD, button, UIBaseElement, UISpriteElement, UITextButton, Draggable, DropTarget, menu, dialogue, Text, BitmapText, font, fontface, wordWrapWidth, NineSliceSprite, score display, floating.

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