Created
November 4, 2018 05:21
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| var totalHeight = 500; | |
| var totalWidth = 1000; | |
| var W = totalWidth; | |
| var H = totalHeight; | |
| var maxResolution = 5; | |
| var branchLength, divergence, reduction, reductionOfReduction, line_width, start_points = []; | |
| function initPjs() { | |
| branchLength = 50; | |
| divergence = 20; | |
| reduction = 0.95; | |
| reductionOfReduction = 0.91; | |
| var trunk = { | |
| x: W / 2, | |
| y: branchLength+50, | |
| angle: 90 | |
| }; | |
| start_points.push(trunk); | |
| melt.line(trunk.x, H - 50, trunk.x, H - trunk.y); | |
| branches(); | |
| } | |
| function branches() { | |
| //reducing line_width and length | |
| reduction *= reductionOfReduction; | |
| branchLength = branchLength * reduction; | |
| line_width = line_width * reduction; | |
| var new_start_points = []; | |
| for (var i = 0; i < start_points.length; i++) { | |
| var sp = start_points[i]; | |
| //2 branches will come out of every start point. Hence there will be | |
| //2 end points. There is a difference in the divergence. | |
| //let rndL = RandomRange(4,10); | |
| //let rndAng = RandomRange(0,70); | |
| var ep1 = get_endpoint(sp.x, sp.y, sp.angle + divergence , branchLength ); | |
| //rndL = RandomRange(4,20); | |
| //rndAng = RandomRange(0,60); | |
| var ep2 = get_endpoint(sp.x, sp.y, sp.angle - divergence , branchLength); | |
| //drawing the branches now | |
| //ctx.moveTo(sp.x, H-sp.y); | |
| //ctx.lineTo(ep1.x, H-ep1.y); | |
| //ctx.moveTo(sp.x, H-sp.y); | |
| //ctx.lineTo(ep2.x, H-ep2.y); | |
| melt.line(sp.x, H - sp.y,ep1.x, H - ep1.y); | |
| melt.line(sp.x, H - sp.y,ep2.x, H - ep2.y); | |
| //Time to make this function recursive to draw more branches | |
| ep1.angle = sp.angle + divergence; | |
| ep2.angle = sp.angle - divergence; | |
| new_start_points.push(ep1); | |
| new_start_points.push(ep2); | |
| } | |
| start_points = new_start_points; | |
| //recursive call - only if length is more than 2. | |
| //Else it will fall in an long loop | |
| if (branchLength > maxResolution) branches(); | |
| //else setTimeout(initPjs, 500); | |
| } | |
| function get_endpoint(x, y, a, myLength) { | |
| //This function will calculate the end points based on simple vectors | |
| var epx = x + myLength * Math.cos(a * Math.PI / 180); | |
| var epy = y + myLength * Math.sin(a * Math.PI / 180); | |
| return { | |
| x: epx, | |
| y: epy | |
| }; | |
| } | |
| initPjs(); | |
| function RandomRange(min, max){ | |
| return Math.floor(Math.random() * max) + min; | |
| } |
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