Last active
July 23, 2018 02:11
Rotating Cube
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
height: 400 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<script async src=https://cdn.JsDelivr.net/npm/p5></script> | |
<script defer src=sketch.js></script> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/***************************************************************** | |
* Rotating Cube (v1.0.5) | |
* PeterCollingridge.AppSpot.com/3D-tutorial | |
* Mod: GoToLoop (2017-Apr-19) | |
* | |
* Forum.Processing.org/two/discussion/22047/ | |
* draw-static-rect-filling-the-screen-infront-of-peasycam#Item_4 | |
* | |
* Bl.ocks.org/GoSubRoutine/a117ecb16a8b0f939a190f87d3a13267 | |
* OpenProcessing.org/sketch/421281 | |
* KhanAcademy.org/computer-programming/3d-tutorial-4/1648921303 | |
*****************************************************************/ | |
"use strict"; | |
const NODE_DIAM = 8, INIT_DEGREE = 30, BOLD = 1.5, | |
BG = 0o350, NODE_COL = '#28A86B', EDGE_COL = '#2244CC'; | |
let bg, edgeCol; | |
const EDGES = Uint8Array.of( | |
0, 1, 1, 3, 3, 2, 2, 0, | |
4, 5, 5, 7, 7, 6, 6, 4, | |
0, 4, 1, 5, 2, 6, 3, 7 | |
); | |
EDGES.forEach((val, idx, arr) => arr[idx] = 3 * val); | |
const nodes = Float32Array.of( | |
-100, -100, -100, | |
-100, -100, +100, | |
-100, +100, -100, | |
-100, +100, +100, | |
+100, -100, -100, | |
+100, -100, +100, | |
+100, +100, -100, | |
+100, +100, +100 | |
); | |
function setup() { | |
createCanvas(400, 400).mouseMoved(rotateCube); | |
ellipseMode(CENTER).angleMode(DEGREES); | |
strokeWeight(BOLD).strokeCap(SQUARE); | |
fill(NODE_COL).noLoop(); | |
bg = color(BG), edgeCol = color(EDGE_COL); | |
rotateZ3D(INIT_DEGREE, nodes); | |
rotateY3D(INIT_DEGREE, nodes); | |
rotateX3D(INIT_DEGREE, nodes); | |
} | |
function draw() { | |
background(bg).translate(width>>1, height>>1); | |
stroke(edgeCol); | |
for (let i = 0, len = EDGES.length; i < len; i += 2) { | |
const indA = EDGES[i], indB = EDGES[i+1], | |
x1 = nodes[indA], y1 = nodes[indA+1], | |
x2 = nodes[indB], y2 = nodes[indB+1]; | |
line(x1, y1, x2, y2); | |
} | |
noStroke(); | |
for (let i = 0, len = nodes.length; i < len; i += 3) | |
ellipse(nodes[i], nodes[i+1], NODE_DIAM); | |
} | |
function rotateCube() { | |
if (mouseIsPressed) { | |
rotateY3D(mouseX - pmouseX, nodes); | |
rotateX3D(mouseY - pmouseY, nodes); | |
redraw(); | |
} | |
//pmouseX = mouseX, pmouseY = mouseY; | |
({ mouseX: pmouseX, mouseY: pmouseY } = window); | |
} | |
function rotateZ3D(t, xyz) { | |
const c = cos(t), s = sin(t), len = xyz.length; | |
for (let i = 0; i < len; i += 3) { | |
const x = xyz[i], y = xyz[i+1]; | |
xyz[i] = x*c - y*s; | |
xyz[i+1] = y*c + x*s; | |
} | |
} | |
function rotateY3D(t, xyz) { | |
const c = cos(t), s = sin(t), len = xyz.length; | |
for (let i = 0; i < len; i += 3) { | |
const x = xyz[i], z = xyz[i+2]; | |
xyz[i] = x*c - z*s; | |
xyz[i+2] = z*c + x*s; | |
} | |
} | |
function rotateX3D(t, xyz) { | |
const c = cos(t), s = sin(t), len = xyz.length; | |
for (let i = 1; i < len; i += 3) { | |
const y = xyz[i], z = xyz[i+1]; | |
xyz[i] = y*c - z*s; | |
xyz[i+1] = z*c + y*s; | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment