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Lecture on std::function (#120)
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‎animation/projects/package-lock.json‎

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‎animation/projects/src/std_function/project.meta‎

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{
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"version": 0,
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"shared": {
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"background": "rgb(10,20,30)",
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"range": [
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0,
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null
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],
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"size": {
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"x": 1920,
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"y": 1080
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},
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"audioOffset": 0
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},
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"preview": {
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"fps": 30,
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"resolutionScale": 1
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},
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"rendering": {
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"fps": 30,
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"resolutionScale": 2,
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"colorSpace": "srgb",
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"exporter": {
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"name": "@motion-canvas/ffmpeg",
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"options": {
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"fastStart": true,
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"includeAudio": true
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}
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}
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}
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}

‎animation/projects/src/std_function/project.ts‎

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import { makeProject } from '@motion-canvas/core';
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import '../../global.css';
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import std_function from './scenes/std_function?scene';
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export default makeProject({
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scenes: [std_function],
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});

‎animation/projects/src/std_function/scenes/std_function.meta‎

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{
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"version": 0,
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"timeEvents": [],
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"seed": 3221513550
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}

‎animation/projects/src/std_function/scenes/std_function.tsx‎

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import { makeScene2D, Code, LezerHighlighter, lines, Node, Rect, Txt, Line } from '@motion-canvas/2d';
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import { all, createRef, waitFor } from '@motion-canvas/core';
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import { MyStyle } from '../../styles';
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import { parser as parser_cpp } from '@lezer/cpp';
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import { DEFAULT } from '@motion-canvas/core/lib/signals';
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import { centerOn } from '../../utils';
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import templateCode from '@lectures/std_function.md?snippet=std_function/template_button.cpp';
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import stdFunctionCode from '@lectures/std_function.md?snippet=std_function/std_function_button.cpp';
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import multiButtonCode from '@lectures/std_function.md?snippet=std_function/multi_button.cpp';
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import typeErasureCode from '@lectures/std_function.md?snippet=std_function/type_erasure.cpp';
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const CppHighlighter = new LezerHighlighter(parser_cpp, MyStyle);
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export default makeScene2D(function* (view) {
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const codeRef = createRef<Code>();
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view.add(
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<Code
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ref={codeRef}
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fontSize={26}
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fontFamily={'Fira Mono'}
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highlighter={CppHighlighter}
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code={templateCode}
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/>
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);
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// Initial delay
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yield* waitFor(1);
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// 1. Template Button
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yield* centerOn(codeRef(), lines(3, 4), 1, 40); // template <typename Callback>
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yield* waitFor(3);
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yield* centerOn(codeRef(), [lines(16, 16), lines(6, 7)], 1, 40); // Callback on_click_;
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yield* waitFor(3);
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yield* centerOn(codeRef(), [lines(16, 16), lines(6, 7), lines(9, 12)], 1, 40); // Callback on_click_;
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yield* waitFor(3);
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yield* centerOn(codeRef(), [lines(24, 25)], 1, 40); // std::vector<Button> buttons;
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yield* waitFor(3);
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yield* centerOn(codeRef(), [lines(24, 24), lines(22, 22)], 1, 40); // std::vector<Button> buttons;
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yield* waitFor(3);
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yield* centerOn(codeRef(), [lines(25, 25), lines(19, 19)], 1, 40); // std::vector<Button> buttons;
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yield* waitFor(3);
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yield* centerOn(codeRef(), [lines(27, 28)], 1, 40); // std::vector<Button> buttons;
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yield* waitFor(3);
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// 3. std::function Button
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yield* codeRef().code(templateCode, 0);
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yield* centerOn(codeRef(), DEFAULT, 0, 24);
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yield* waitFor(1);
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yield* codeRef().code(stdFunctionCode, 1);
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yield* waitFor(1);
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yield* centerOn(codeRef(), lines(7, 7), 1, 40); // explicit Button(std::string name, std::function<void()> callback)
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yield* waitFor(1);
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yield* centerOn(codeRef(), [lines(7, 8), lines(17, 17)], 1, 40); // explicit Button(std::string name, std::function<void()> callback)
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yield* waitFor(3);
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yield* centerOn(codeRef(), lines(22, 48), 1, 40); // std::function<void()> on_click_;
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yield* waitFor(3);
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yield* centerOn(codeRef(), lines(28, 30), 1, 40); // std::vector<Button> buttons{play_button, quit_button};
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yield* waitFor(3);
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// 4. MultiButton
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yield* codeRef().code(stdFunctionCode, 0);
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yield* centerOn(codeRef(), DEFAULT, 0, 22);
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yield* waitFor(1);
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yield* codeRef().code(multiButtonCode, 1);
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yield* waitFor(1);
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yield* centerOn(codeRef(), [lines(7, 8)], 1, 30);
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yield* waitFor(0.5);
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yield* centerOn(codeRef(), [lines(7, 8), lines(19, 19)], 1, 30);
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yield* waitFor(3);
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yield* centerOn(codeRef(), [lines(25, 28), lines(30, 30)], 1, 30);
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yield* waitFor(1);
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yield* centerOn(codeRef(), [lines(12, 14)], 1, 30);
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yield* waitFor(3);
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yield* centerOn(codeRef(), DEFAULT, 1, 22);
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yield* waitFor(3);
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yield* centerOn(codeRef(), [lines(13, 13)], 1, 35);
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yield* waitFor(3);
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// 5. Type Erasure
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yield* centerOn(codeRef(), DEFAULT, 0, 20);
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yield* codeRef().code(typeErasureCode, 0);
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yield* waitFor(1);
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yield* centerOn(codeRef(), lines(3, 3), 1, 32);
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yield* waitFor(1);
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yield* centerOn(codeRef(), [lines(13, 18), lines(28, 28)], 1, 32);
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yield* waitFor(1);
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yield* centerOn(codeRef(), lines(19, 27), 1, 36);
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yield* waitFor(1);
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yield* centerOn(codeRef(), [lines(19, 27), lines(5, 8)], 1, 35);
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yield* waitFor(3);
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yield* centerOn(codeRef(), lines(30, 42), 1, 36);
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yield* waitFor(3);
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yield* centerOn(codeRef(), lines(10, 10), 1, 36);
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yield* waitFor(1);
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yield* centerOn(codeRef(), [lines(16, 16)], 1, 35);
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yield* waitFor(1);
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yield* centerOn(codeRef(), [lines(23, 23)], 1, 35);
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yield* waitFor(3);
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const myFuncRect = createRef<Rect>();
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const baseRect = createRef<Rect>();
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const implRect = createRef<Rect>();
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const tRect = createRef<Rect>();
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const line1 = createRef<Line>();
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const line2 = createRef<Line>();
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const line3 = createRef<Line>();
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view.add(
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<Node y={0} scale={1.4}>
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<Rect ref={myFuncRect} width={240} height={60} x={-505} fill="#2d2d2d" radius={10} opacity={0}>
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<Txt text="~MyFunction()" fill="#eeeeee" fontFamily="Fira Mono" fontSize={24} />
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</Rect>
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<Line ref={line1} points={[[-375, 0], [-295, 0]]} stroke="#569CD6" lineWidth={4} endArrow end={0} />
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<Rect ref={baseRect} width={260} height={60} x={-155} fill="#2d2d2d" radius={10} opacity={0}>
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<Txt text="~CallableBase()" fill="#eeeeee" fontFamily="Fira Mono" fontSize={24} />
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</Rect>
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<Line ref={line2} points={[[-15, 0], [65, 0]]} stroke="#569CD6" lineWidth={4} endArrow end={0} />
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<Rect ref={implRect} width={300} height={60} x={225} fill="#2d2d2d" radius={10} opacity={0}>
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<Txt text="~CallableImpl<T>()" fill="#eeeeee" fontFamily="Fira Mono" fontSize={24} />
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</Rect>
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<Line ref={line3} points={[[385, 0], [465, 0]]} stroke="#569CD6" lineWidth={4} endArrow end={0} />
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<Rect ref={tRect} width={150} height={60} x={550} fill="#2d2d2d" radius={10} opacity={0}>
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<Txt text="~T()" fill="#eeeeee" fontFamily="Fira Mono" fontSize={24} />
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</Rect>
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</Node>
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);
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// 6. Destructors flow
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yield* codeRef().opacity(0, 1);
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yield* myFuncRect().opacity(1, 0.5);
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yield* waitFor(0.5);
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yield* line1().end(1, 0.5);
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yield* baseRect().opacity(1, 0.5);
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yield* waitFor(0.5);
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yield* line2().end(1, 0.5);
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yield* implRect().opacity(1, 0.5);
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yield* waitFor(0.5);
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yield* line3().end(1, 0.5);
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yield* tRect().opacity(1, 0.5);
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yield* waitFor(3);
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yield* all(
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tRect().opacity(0, 0.5),
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line3().opacity(0, 0.5),
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implRect().opacity(0, 0.5),
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line2().opacity(0, 0.5),
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baseRect().opacity(0, 0.5),
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line1().opacity(0, 0.5),
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myFuncRect().opacity(0, 0.5),
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);
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yield* centerOn(codeRef(), DEFAULT, 0, 20);
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yield* codeRef().opacity(1, 1);
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yield* centerOn(codeRef(), DEFAULT, 1, 20);
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yield* waitFor(3);
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});

‎animation/projects/vite.config.ts‎

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motionCanvas({
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project: [
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'./src/dummy/project.ts',
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'./src/std_function/project.ts',
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]
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}),
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ffmpeg(),

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