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https://git.sleeping.town/mirrors/foxy-moxy
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bezier curves and kappa
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Jeffrey Sun
parent
d75f446e84
commit
4a64a2f57f
2 changed files with 54 additions and 85 deletions
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@ -41,8 +41,8 @@ var Fox = function (IMG_WIDTH, IMG_HEIGHT) {
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},
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head: {
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origin: origin,
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headWidth: headWidth,
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headHeight:headHeight
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width: headWidth,
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height: headHeight
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},
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ears: ears,
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eyes: eyes,
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135
server.js
135
server.js
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@ -2,37 +2,37 @@ var Fox = require('./js/fox.js');
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var davis = require('./js/davis.js');
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var geo = require('./js/geo.js');
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var ngon = function (c) {
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var n=c.n || 3;
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var ctx= c.context || false;
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var x=c.x || 500;
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var y=c.y || x;
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var r=c.r || 500;
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if (n%2==0){
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var rotation=360/(n*2)*davis.random(n*2);
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}
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else {
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var rotation=90+(180*davis.random(2));
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};
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rotation=c.rotation || rotation;
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var color=c.color || davis.randomColor("grey");
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var lineWidth=c.lineWidth || 1;
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var fill=c.fill || davis.randcomColor();
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ctx.beginPath();
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for (var i=0;i<n+2;i++){
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var nx=geo.getPoint(x,y,r,rotation+(i*360/n)).x2;
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var ny=geo.getPoint(x,y,r,rotation+(i*360/n)).y2;
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ctx.lineTo(nx,ny);
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}
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ctx.lineJoin='miter';
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ctx.strokeStyle=color;
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ctx.lineWidth=lineWidth;
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ctx.fillStyle=fill;
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ctx.fill();
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ctx.stroke();
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return true;
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};
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// var ngon = function (c) {
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// var n=c.n || 3;
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//
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// var ctx= c.context || false;
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// var x=c.x || 500;
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// var y=c.y || x;
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// var r=c.r || 500;
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// if (n%2==0){
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// var rotation=360/(n*2)*davis.random(n*2);
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// }
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// else {
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// var rotation=90+(180*davis.random(2));
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// };
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// rotation=c.rotation || rotation;
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// var color=c.color || davis.randomColor("grey");
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// var lineWidth=c.lineWidth || 1;
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// var fill=c.fill || davis.randcomColor();
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// ctx.beginPath();
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// for (var i=0;i<n+2;i++){
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// var nx=geo.getPoint(x,y,r,rotation+(i*360/n)).x2;
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// var ny=geo.getPoint(x,y,r,rotation+(i*360/n)).y2;
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// ctx.lineTo(nx,ny);
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// }
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// ctx.lineJoin='miter';
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// ctx.strokeStyle=color;
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// ctx.lineWidth=lineWidth;
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// ctx.fillStyle=fill;
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// ctx.fill();
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// ctx.stroke();
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// return true;
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// };
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var renderFox = function (canvas, opts) {
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var width = opts.canvas.width;
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@ -40,17 +40,31 @@ var renderFox = function (canvas, opts) {
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var ctx = canvas.getContext('2d');
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ctx.beginPath();
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circle({
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gradient:false,
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context:ctx,
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x: width/2,
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y: height/2,
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r: width/2,
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});
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drawEllipseByCenter(ctx, width/2, height/2, opts.head.width, opts.head.height);
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};
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function drawEllipseByCenter(ctx, cx, cy, w, h) {
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drawEllipse(ctx, cx - w/2.0, cy - h/2.0, w, h);
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}
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function drawEllipse(ctx, x, y, w, h) {
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var kappa = .3,
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ox = (w / 2) * kappa, // control point offset horizontal
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oy = (h / 2) * kappa, // control point offset vertical
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xe = x + w, // x-end
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ye = y + h, // y-end
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xm = x + w / 2, // x-middle
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ym = y + h / 2; // y-middle
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ctx.beginPath();
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ctx.moveTo(x, ym);
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ctx.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
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ctx.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
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ctx.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
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ctx.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
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//ctx.closePath(); // not used correctly, see comments (use to close off open path)
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ctx.stroke();
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}
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var circle = function(c){
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var ctx= c.context || false;
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@ -71,51 +85,6 @@ var circle = function(c){
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return true;
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};
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var radial = function(ctx,width,height){
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ctx.beginPath();
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ctx.arc(width/2,width/2,davis.random(width/2),0,2*Math.PI);
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ctx.strokeStyle=davis.randomColor();
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ctx.lineWidth=1+davis.random(0.5*width);
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ctx.stroke();
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for (var j=0;j<davis.random(4);j++){
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var r=davis.random(width/2);
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var rf=davis.random(width/2);
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var color=davis.randomColor();
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davis.maybe(2,3,function(){color=davis.randomColor("grey");});
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var lw=1+davis.random(width/10);
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var steps=1+davis.random(30);
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var incrementMod=davis.random(3)*90;
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var n=davis.random(6);
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var rotation=90*davis.random(3);
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var fadeColor=davis.pick(["rgba(0,0,0,0)","rgba(255,255,255,0)"]);
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var fadeRadius=Math.random();
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davis.maybe(1,5,function(){fadeRadius=0;});
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davis.maybe(1,5,function(){fadeRadius=false;});
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for (var i=0;i<steps;i++){
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var increment=i*360/steps;
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var x=geo.getPoint(width/2,height/2,rf,increment+incrementMod).x2;
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var y=geo.getPoint(width/2,height/2,rf,increment+incrementMod).y2;
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circle({
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n:n,
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gradient:true,
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context:ctx,
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x:x,
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y:y,
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r:r,
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rotation:rotation,
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lineWidth:lw,
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color:color,
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fadeColor:fadeColor,
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fadeRadius:fadeRadius
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});
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}
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}
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};
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var Canvas = require('canvas');
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var express = require('express');
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var fs = require('fs');
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