Viewing Program

Program Data

Program thumbnail for "{props.program.title}"

Title	Shaded box
ID	1066372924
Created	13 years ago, 1352747387714
Updated	11 years ago, 1402758599645
Code	/* Draws a shaded object, so long as it is convex. You can rotate it about the centre of the screen using the arrow keys or by holding the mouse down. / // Move to centre of screen translate(200.5, 200.5); stroke(162, 169, 189); var BLACK = color(0, 0, 0); var faceColor = color(80, 80, 250); var lightVector =[0.5, -0.2, -2]; var backgroundLight = 0.1; var createCuboid = function(x, y, z, w, h, d) { var nodes = [[x, y, z], [x, y, z + d], [x, y + h, z], [x, y + h, z + d], [x + w, y, z], [x + w, y, z + d], [x + w, y + h, z], [x + w, y + h, z + d]]; var faces= [[0, 1, 3, 2], [1, 0, 4, 5], [0, 2, 6, 4], [3, 1, 5, 7], [5, 4, 6, 7], [2, 3, 7, 6]]; return { 'nodes': nodes, 'faces': faces }; }; var box1 = createCuboid(-100, -100, -100, 200, 200, 200); var objects = [box1]; var subtractVectors = function(v1, v2){ return [[v1[0] - v2[0]], [v1[1] - v2[1]], [v1[2] - v2[2]]]; }; var normaliseVector = function(v) { var d = sqrt(v[0]v[0]+v[1]v[1]+v[2]v[2]); return [v[0]/d, v[1]/d, v[2]/d]; }; var normalOfPlane = function(face, nodes) { var n1 = nodes[face[0]]; var n2 = nodes[face[1]]; var n3 = nodes[face[2]]; var v1 = subtractVectors(n1, n2); var v2 = subtractVectors(n1, n3); var v3 = [[v1[1]v2[2] - v1[2]v2[1]], [v1[2]v2[0] - v1[0]v2[2]], [v1[0]v2[1] - v1[1]v2[0]]]; return v3; }; var dotProduct = function(v1, v2){ // Assume everything has 3 dimensions return v1[0]v2[0] + v1[1]v2[1] + v1[2]v2[2]; }; var translate3D = function(x, y, z, nodes) { for (var i = 0; i < nodes.length; i++) { nodes[i] = [nodes[i][0] + x, nodes[i][1] + y, nodes[i][2] + z]; } }; var rotateY3D = function(theta, nodes) { var ct = cos(theta); var st = sin(theta); var x, y, z; for (var i = 0; i < nodes.length; i+=1) { x = nodes[i][0]; y = nodes[i][1]; z = nodes[i][2]; nodes[i] = [ctx + stz, y, -stx + ctz]; } }; var rotateX3D = function(theta, nodes){ var ct = cos(theta); var st = sin(theta); var x, y, z; for (var i = 0; i < nodes.length; i+=1) { x = nodes[i][0]; y = nodes[i][1]; z = nodes[i][2]; nodes[i] = [x, cty - stz, sty + ctz]; } }; lightVector = normaliseVector(lightVector); var draw = function() { var i; var face, nodes, node1, node2; background(255, 255, 255); for (var o in objects) { var obj = objects[o]; nodes = obj.nodes; if ('edges' in obj) { var edges = obj.edges; for (i = 0; i < edges.length; i+=1) { node1 = nodes[edges[i][0]]; node2 = nodes[edges[i][1]]; line(node1[0], node1[1], node2[0], node2[1]); } } if ('faces' in obj) { for (var f in obj.faces) { face = obj.faces[f]; var fnorm = normalOfPlane(face, nodes); if (fnorm[2] < 0) { var l = max(0, dotProduct(lightVector, normaliseVector(fnorm))); l = backgroundLight + (1 - backgroundLight) l; var c = lerpColor(BLACK, faceColor, l); fill(c); if (face.length === 3) { triangle(nodes[face[0]][0], nodes[face[0]][1], nodes[face[1]][0], nodes[face[1]][1], nodes[face[2]][0], nodes[face[2]][1]); } else { quad(nodes[face[0]][0], nodes[face[0]][1], nodes[face[1]][0], nodes[face[1]][1], nodes[face[2]][0], nodes[face[2]][1], nodes[face[3]][0], nodes[face[3]][1]); } } } } } }; var mouseDragged = function() { var dx = 0.5 * (mouseX - pmouseX); var dy = -0.5 * (mouseY - pmouseY); for (var obj = 0; obj < objects.length; obj++) { var nodes = objects[obj].nodes; rotateY3D(dx, nodes); rotateX3D(dy, nodes); } }; var keyPressed = function() { var f = 0; var d = 0; if (keyCode === LEFT) { f = rotateY3D; d = -2; } else if (keyCode === RIGHT) { f = rotateY3D; d = 2; } else if (keyCode === UP) { f = rotateX3D; d = 2; } else if (keyCode === DOWN) { f = rotateX3D; d = -2; } if (f !== 0) { for (var obj in objects) { f(d, objects[obj].nodes); } } }; rotateX3D(30, box1.nodes); rotateY3D(60, box1.nodes);
Folds
Fork	false
Key	ag5zfmtoYW4tYWNhZGVteXIUCxIKU2NyYXRjaHBhZBi8nr78Aww
Votes	329
Spin-Offs	109
Type	PJS
Width	400
Height	400
User Flagged	false
Origin Scratchpad	{"id":"1063016315","title":"Ping pong ball laucher","deleted":"false","official":"false"}
Hidden From Hotlist	false
Restricted Posting	false
By Child	false
Author Nick	Peter Collingridge
Author Name	peterwcollingridge
Author ID	kaid_1128810778687926889052316
Author Profile Access	COACH

Archive Data

Added	10 months ago, 1739279680701
Updated	8 months ago, 1744828879386
Source Deleted	unknown