Created
February 16, 2019 10:19
-
-
Save TheAnimatrix/794f67f795df1b96bbc87dbce2c8edf3 to your computer and use it in GitHub Desktop.
Create a simple directed acyclic graph by double-clicking! (made with p5.js)
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
function setup() { | |
createCanvas(400, 400); | |
angleMode(DEGREES); | |
line(2,2,2,400); | |
line(2,2,400,2); | |
} | |
function arrow(x,y,angle){ | |
beginShape(LINES); | |
vertex(x,y); | |
vertex(x+13*cos(180+angle+25),y+13*sin(180+angle+25)); | |
vertex(x,y); | |
vertex(x+13*cos(180+angle-25),y+13*sin(180+angle-25)); | |
endShape(); | |
} | |
class Node { | |
constructor(x,y){ | |
this.x = x; | |
this.y = y; | |
} | |
angleToNode(node){ | |
let m = (this.y-node.y)/(this.x-node.x); | |
if(node.x > this.x) return atan(m); | |
else return 180+atan(m); | |
} | |
connect(dest){ | |
let node1=this; | |
let node2=dest; | |
if(!(node1 instanceof Node && node2 instanceof Node)) | |
return false; | |
let angle = node1.angleToNode(node2) | |
line(node1.x + (radius*cos(angle)) ,node1.y + (radius*sin(angle)),node2.x + (radius*cos(angle+180)) ,node2.y + (radius*sin(angle+180))); | |
arrow(node2.x + (radius*cos(angle+180)) ,node2.y + (radius*sin(angle+180)),angle); | |
return true; | |
} | |
} | |
let new_node; | |
let radius = 30; | |
let nodes = [] | |
i=-1; | |
let redraw = false; | |
function draw() { | |
background(255); | |
if(typeof new_node == 'object'){ | |
i++; | |
ellipse(nodes[i].x,nodes[i].y,radius*2); | |
new_node=0; | |
} | |
for(c=0; c<=i; c++){ | |
ellipse(nodes[c].x,nodes[c].y,radius*2); | |
if(c>=1) | |
nodes[c-1].connect(nodes[c]); | |
} | |
} | |
function doubleClicked() { | |
new_node = new Node(mouseX,mouseY); | |
nodes.push(new_node); | |
redraw=true; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment