CSS Motion Pathã®æç¶ãåçæã®äžçãæ¢æ±ããŸãããããŠã§ãäœéšãåäžãããåçã§ã¢ã«ãŽãªãºã çã«å®çŸ©ãããã¢ãã¡ãŒã·ã§ã³ãã¹ã®äœææ¹æ³ãåŠã³ãŸãã
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CSS Motion Pathã¯ãå®çŸ©ããããã¹ã«æ²¿ã£ãŠèŠçŽ ãã¢ãã¡ãŒã·ã§ã³ããã匷åãªæ¹æ³ãæäŸããŸããåçŽãªãã¹ã¯æåã§äœæã§ããŸãããæç¶ãåçæã¯ãè€éã§åçãããã«ã¯ã©ã³ãã åãããã¢ãŒã·ã§ã³ãã¹ãã¢ã«ãŽãªãºã çã«äœæããããã®é åçãªå¯èœæ§ãåºããŸãããã®ã¢ãããŒãã¯ãé«åºŠãªã¢ãã¡ãŒã·ã§ã³æè¡ãè§£ãæŸã¡ããŠããŒã¯ãªãŠãŒã¶ãŒäœéšãå¯èœã«ããŸãããã®èšäºã§ã¯ãCSS Motion Pathã®æç¶ãåçæã®æŠå¿µãæè¡ãããã³å®çšçãªã¢ããªã±ãŒã·ã§ã³ãæ¢æ±ããŸãã
CSS Motion Pathã®çè§£
æç¶ãåçæã«æ·±ãå ¥ãåã«ãCSS Motion Pathãç°¡åã«æ¯ãè¿ããŸããããããã¯ãSVGãã¹ã³ãã³ãã䜿çšããŠæå®ããããã¹ã«æ²¿ã£ãŠèŠçŽ ãã¢ãã¡ãŒã·ã§ã³ãããããšãå¯èœã«ããŸããããã«ãããåçŽãªãã©ã³ãžã·ã§ã³ãããŒãã¬ãŒã ãããã¢ãã¡ãŒã·ã§ã³ããã詳现ã«å¶åŸ¡ã§ããŸãã
åºæ¬çãªããããã£ã¯æ¬¡ã®ãšããã§ãã
- offset-path: èŠçŽ ãç§»åãããã¹ãå®çŸ©ããŸããããã¯ãã€ã³ã©ã€ã³ã§å®çŸ©ãããSVGãã¹ãå€éšSVGãã¡ã€ã«ããåç §ããããã¹ããŸãã¯åºæ¬çãªå³åœ¢ã䜿çšããŠäœæããããã¹ã®ããããã§ãã
- offset-distance: ãã¹ã«æ²¿ã£ãäœçœ®ãæå®ããŸãã0%ã®å€ã¯ãã¹ã®éå§ã衚ãã100%ã¯çµäºã衚ããŸãã
- offset-rotate: ãã¹ã«æ²¿ã£ãŠèŠçŽ ãç§»åããéã®å転ãå¶åŸ¡ããŸãããautoãã¯èŠçŽ ããã¹ã®æ¥ç·ã«åããããæ°å€ãã¯åºå®å転ãæå®ããŸãã
äŸãã°ãåçŽãªæ²ç·ãã¹ã«æ²¿ã£ãŠåè§åœ¢ãç§»åãããã«ã¯ã以äžã®CSSã䜿çšã§ããŸãã
.square {
width: 50px;
height: 50px;
background-color: blue;
position: absolute;
offset-path: path('M10,80 C40,10 65,10 95,80 S150,150 180,80');
animation: move 5s linear infinite;
}
@keyframes move {
0% { offset-distance: 0%; }
100% { offset-distance: 100%; }
}
æç¶ãåçæã®å
ãã®æèã«ãããæç¶ãåçæãšã¯ãã¢ã«ãŽãªãºã ã䜿çšããŠSVGãã¹æååãåçã«äœæããããšã§ããåãã¹ãæäœæ¥ã§äœæãã代ããã«ããã¹ã®åœ¢ç¶ãšç¹æ§ãå¶åŸ¡ããã«ãŒã«ãšãã©ã¡ãŒã¿ãŒãå®çŸ©ã§ããŸããããã«ãããããã€ãã®å©ç¹ãããããããŸãã
- è€éæ§: æäœæ¥ã§ã¯é¢åãŸãã¯äžå¯èœã ã£ããè€éã§å ¥ãçµãã ãã¹ãç°¡åã«çæã§ããŸãã
- åçæ§: ãŠãŒã¶ãŒå ¥åãããŒã¿ããŸãã¯ãã®ä»ã®èŠå ã«åºã¥ããŠããã¹ãã©ã¡ãŒã¿ãŒããªã¢ã«ã¿ã€ã ã§å€æŽããŸããããã«ãããã€ã³ã¿ã©ã¯ãã£ãã§å¿çæ§ã®é«ãã¢ãã¡ãŒã·ã§ã³ãå¯èœã«ãªããŸãã
- ã©ã³ãã å: ãã¹çæããã»ã¹ã«ã©ã³ãã æ§ãå°å ¥ãããŠããŒã¯ã§èŠèŠçã«è峿·±ãã¢ãã¡ãŒã·ã§ã³ãäœæããŸãã
- å¹çæ§: ããã°ã©ã ã§ãã¹ãçæããããšã§ã倧ããªéçSVGãã¡ã€ã«ã®å¿ èŠæ§ãæžãããŸãã
æç¶ãåãã¹çæã®æè¡
SVGãã¹ãã¢ã«ãŽãªãºã çã«çæããããã«ããã€ãã®æè¡ã䜿çšã§ããããããã«é·æãšçæããããŸããäžè¬çãªã¢ãããŒãã«ã¯ä»¥äžãå«ãŸããŸãã
1. æ°åŠç颿°
ãµã€ã³æ³¢ãã³ãµã€ã³æ³¢ãããžã§æ²ç·ãªã©ã®æ°åŠç颿°ã䜿çšããŠãã¹ã®åº§æšãå®çŸ©ããŸãããã®ã¢ãããŒãã«ããããã¹ã®åœ¢ç¶ãæ£ç¢ºã«å¶åŸ¡ã§ããŸããäŸãã°ããµã€ã³é¢æ°ã䜿çšããŠæ£åŒŠæ³¢ãã¹ãäœæã§ããŸãã
function generateSinWavePath(amplitude, frequency, length) {
let path = 'M0,0';
for (let i = 0; i <= length; i++) {
const y = amplitude * Math.sin(frequency * i);
path += ` L${i},${y}`;
}
return path;
}
const sinWavePath = generateSinWavePath(50, 0.1, 500);
ãã®JavaScriptã³ãŒãã¯ããµã€ã³æ³¢ã衚ãSVGãã¹æååãçæããŸããamplitudeãfrequencyãlengthã®åãã©ã¡ãŒã¿ãŒã¯æ³¢ã®ç¹æ§ãå¶åŸ¡ããŸãããã®ãã¹æååãoffset-pathããããã£ã§äœ¿çšã§ããŸãã
2. Lã·ã¹ãã (Lindenmayer System)
Lã·ã¹ãã ã¯ãè€éãªãã©ã¯ã¿ã«ãã¿ãŒã³ãçæããããã«äœ¿çšãããåœ¢åŒææ³ã§ãããããã¯åæå ¬çãçæèŠåãããã³äžé£ã®åœä»€ã§æ§æãããŸããäž»ã«æ€ç©ã®ãããªæ§é ãçæããããã«äœ¿çšãããŸãããè峿·±ãæœè±¡çãªãã¹ãäœæããããã«ãå¿çšã§ããŸãã
Lã·ã¹ãã ã¯ãåææååã«çæèŠåãç¹°ãè¿ãé©çšããããšã§æ©èœããŸããäŸãã°ã以äžã®Lã·ã¹ãã ãèããŠã¿ãŸãããã
- å ¬ç: F
- çæèŠå: F -> F+F-F-F+F
ãã®ã·ã¹ãã ã¯ãåãFãããF+F-F-F+Fãã«çœ®ãæããŸãããFããåæ¹ã«ç·ãåŒãããšã衚ããã+ããæèšåãã«å転ããããšã衚ããã-ããåæèšåãã«å転ããããšã衚ãå Žåãç¹°ãè¿ãã®å埩ã«ãã£ãŠè€éãªãã¿ãŒã³ãçæãããŸãã
Lã·ã¹ãã ã®å®è£ ã«ã¯ãããè€éãªã¢ã«ãŽãªãºã ãå¿ èŠãšãªãããšãå€ãã§ãããè€éã§ææ©çãªèŠãç®ã®ãã¹ãçã¿åºãããšãã§ããŸãã
3. ããŒãªã³ãã€ãº
ããŒãªã³ãã€ãºã¯ãæ»ãããªç䌌乱æ°å€ãçæããã°ã©ããŒã·ã§ã³ãã€ãºé¢æ°ã§ãããªã¢ã«ãªãã¯ã¹ãã£ãèªç¶ãªåœ¢ç¶ãäœæããããã«ãã䜿çšãããŸããã¢ãŒã·ã§ã³ãã¹ã®æèã§ã¯ãããŒãªã³ãã€ãºã䜿çšããŠæ³¢æã€ãããªææ©çãªãã¹ãäœæã§ããŸãã
simplex-noiseïŒnpmçµç±ã§å©çšå¯èœïŒã®ãããªã©ã€ãã©ãªã¯ãJavaScriptã§ããŒãªã³ãã€ãºã®å®è£
ãæäŸããŸãããããã®ã©ã€ãã©ãªã䜿çšããŠäžé£ã®ç¹ãçæããããããæ¥ç¶ããŠãã¹ã圢æã§ããŸãã
import SimplexNoise from 'simplex-noise';
function generatePerlinNoisePath(width, height, scale) {
const simplex = new SimplexNoise();
let path = 'M0,' + (height / 2);
for (let x = 0; x <= width; x++) {
const y = height / 2 + simplex.noise2D(x / scale, 0) * height / 2;
path += ` L${x},${y}`;
}
return path;
}
const perlinNoisePath = generatePerlinNoisePath(500, 100, 50);
ãã®ã³ãŒãã¯ãããŒãªã³ãã€ãºã䜿çšããŠæ»ããã«èè¡ãããã¹ãçæããŸããwidthãheightãscaleã®åãã©ã¡ãŒã¿ãŒããã¹å
šäœã®å€èгãå¶åŸ¡ããŸãã
4. ã¹ãã©ã€ã³è£é
ã¹ãã©ã€ã³è£éã¯ãäžé£ã®å¶åŸ¡ç¹ãééããæ»ãããªæ²ç·ãäœæããããã®æè¡ã§ãã3次ããžã§ã¹ãã©ã€ã³ã¯ããã®æè»æ§ãšå®è£ ã®å®¹æãããäžè¬çãªéžæè¢ã§ããå¶åŸ¡ç¹ãã¢ã«ãŽãªãºã çã«çæããããšã§ãæ§ã ãªæ»ããã§è€éãªãã¹ãäœæã§ããŸãã
bezier-jsã®ãããªã©ã€ãã©ãªã¯ãJavaScriptã§ããžã§æ²ç·ãäœæããã³æäœããããã»ã¹ãç°¡çŽ åã§ããŸãã
import Bezier from 'bezier-js';
function generateBezierSplinePath(controlPoints) {
if (controlPoints.length < 4) {
return ''; // Need at least 4 points for a cubic Bézier
}
let path = `M${controlPoints[0].x},${controlPoints[0].y}`;
for (let i = 0; i < controlPoints.length - 3; i += 3) {
const curve = new Bezier(controlPoints[i].x, controlPoints[i].y, controlPoints[i+1].x, controlPoints[i+1].y, controlPoints[i+2].x, controlPoints[i+2].y, controlPoints[i+3].x, controlPoints[i+3].y);
path += ` C${controlPoints[i+1].x},${controlPoints[i+1].y} ${controlPoints[i+2].x},${controlPoints[i+2].y} ${controlPoints[i+3].x},${controlPoints[i+3].y}`;
}
return path;
}
// Example usage: Generate random control points
function createRandomControlPoints(numPoints, width, height) {
const points = [];
for (let i = 0; i < numPoints; i++) {
points.push({ x: Math.random() * width, y: Math.random() * height });
}
return points;
}
const randomPoints = createRandomControlPoints(7, 500, 100);
const bezierSplinePath = generateBezierSplinePath(randomPoints);
ãã®äŸã¯ãäžé£ã®å¶åŸ¡ç¹ããããžã§ã¹ãã©ã€ã³ãã¹ãäœæããæ¹æ³ã瀺ããŠããŸããå¶åŸ¡ç¹ãã«ã¹ã¿ãã€ãºããŠãç°ãªããã¹åœ¢ç¶ãçæã§ããŸãããã®äŸã¯ãŸããã©ã³ãã ãªå¶åŸ¡ç¹ãçæããæ¹æ³ã瀺ããŠãããããã«ããæ§ã ãªè峿·±ããã¹ã®äœæãå¯èœã«ãªããŸãã
5. æè¡ã®çµã¿åãã
æã匷åãªã¢ãããŒãã¯ãç°ãªãæè¡ãçµã¿åãããããšããããããŸããäŸãã°ãããŒãªã³ãã€ãºã䜿çšããŠãµã€ã³æ³¢ã®æ¯å¹ ãå€èª¿ããæ³¢ç¶ã§ææ©çãªãã¹ãäœæã§ããŸãããããã¯ãLã·ã¹ãã ã䜿çšããŠãã©ã¯ã¿ã«ãã¿ãŒã³ãçæãããã®åŸã¹ãã©ã€ã³è£éã䜿çšããŠæ»ããã«ããããšãã§ããŸãã
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- ã€ã³ã¿ã©ã¯ãã£ããªããŒã¿èŠèŠå: ãã¬ã³ããé¢ä¿ã衚ããã¹ã«æ²¿ã£ãŠããŒã¿ãã€ã³ããã¢ãã¡ãŒã·ã§ã³åããŸãããã¹ã¯ããŒã¿ãæŽæ°ãããã«ã€ããŠåçã«å€åããŸãã
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