DOM vs. Canvas
Choose a drawing model by reasoning about updates, interaction, and the objects your app needs to remember.
6 questions
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Critical thinking for an AI world
Review drawing state, motion, and interaction. Find the assumptions that make a canvas scene work or break.
Choose from 28 quizzes below. Practice the concepts you need to judge a solution, recognize faulty assumptions, and find errors in logic or code. Every answer includes an explanation and a link back to the relevant tutorial.
Canvas FoundationsChoose a drawing model by reasoning about updates, interaction, and the objects your app needs to remember.
6 questions
Take quizUnderstand the drawing surface, its coordinate system, and why visible pixels depend on more than CSS.
6 questions
Take quizDecide where a shape's state belongs and how to redraw many independent objects without losing track of them.
8 questions
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Drawing and StylingReason about paths, coordinates, and the difference between describing a line and making it visible.
6 questions
Take quizPredict how endpoints and control points change the shape of a curve.
4 questions
Take quizDiagnose connected paths, shared styles, and unexpected overlap when several shapes share a canvas.
6 questions
Take quizChoose between a reusable rectangle path and immediate drawing, and reason about fills and outlines.
6 questions
Take quizUse vertices, closed paths, and geometric constraints to judge whether a triangle is drawn correctly.
6 questions
Take quizUnderstand the center, radius, and angular sweep behind circles and partial arcs.
6 questions
Take quizExplain sharp corners, rounded joins, and the spikes that can appear where thick lines meet.
4 questions
Take quizReason about paint state, transparency, and the coordinates that shape a gradient.
8 questions
Take quizDiagnose text positioning and sizing by understanding alignment, baselines, and font measurements.
6 questions
Take quizSeparate image loading, cropping, and scaling so you can explain blank or distorted drawings.
8 questions
Take quizPredict how changing the coordinate system affects drawing order, rotation, and shared state.
8 questions
Take quizReason about equal sides, geometric centers, and reusable triangle coordinates.
6 questions
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Animation and InteractionExplain how changing state and redrawing frames create motion, and diagnose unwanted trails.
6 questions
Take quizKeep animation state independent while coordinating drawing and cleanup through a shared frame loop.
6 questions
Take quizBuild a useful mental model of position history, drawing order, and bounded trail storage.
6 questions
Take quizReason about sprite-sheet crops, playback timing, and the difference between a frame and a whole image.
6 questions
Take quizChoose the right coordinate space and understand what a pointer event can tell you about drawn shapes.
6 questions
Take quizConnect pointer input to drawing state without confusing event timing with animation timing.
6 questions
Take quizUnderstand why distance-based movement slows near a target and how coordinate changes affect it.
6 questions
Take quizReason about key state, simultaneous input, browser defaults, and movement on a pixel surface.
6 questions
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Sizing and SharpnessDistinguish display size from drawing-buffer size and explain why resizing can erase a scene.
4 questions
Take quizMatch drawing-buffer resolution to display density without changing the intended size of your scene.
6 questions
Take quizChoose spacing and line placement that keep a grid regular and sharp.
6 questions
Take quizKeep a canvas grid aligned with the available viewport when its dimensions change.
4 questions
Take quizExplain soft edges through pixel coverage instead of guessing at line widths or display settings.
6 questions
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