More experiments on Javascript and html5 rendering..
Implementing the Quickhull algorithm. This will find out a fast optimal bounding volume encapsulating all the points.

Steps:

1. Find the bounding box
2. Find the points lying on the box, they form a quad..
3. Eliminate the points lying inside the formed boundary
4. Find the farthest point away from each edges and form a triangle of that edge with the point.
5. Eliminate the points lying inside the triangle and add the two new edges to the hull
6. Repeat the steps 3-5 till no points are found outside the hull.

So far, being able to capture points on canvas, was able to compute AABB and the inside quad, need to create a javascript datastructure for storing edges, and inserting edges in between. Remaining tomorrow...

The interactive canvas below (requires google chrome):

/* This program demonstrates the working of Bezier curve and shows * the working of blending functions * Copyright (C) 2011 Rishikesh Parkhe * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */

var ctx; var degree = 0; var pts_x = new Array(); /pts_x = 10; pts_x = 50; pts_x = 90; pts_x = 180; pts_x = 280; pts_x = 350;/

var pts_y = new Array(); /pts_y = 50; pts_y = 130; pts_y = 220; pts_y = 40; pts_y = 340; pts_y = 40;/ var mouse_x=0; var mouse_y=0;

var render_x = new Array(); var render_y = new Array();

var bound_x = new Array(); var bound_y = new Array();

var bernstein_coeffs = new Array();

var min_x; var max_x; var min_y; var max_y;

var indices = new Array();

function point_inside_tri() {

}

function get_render_lines() { indices = new Array(); indices = 0; indices = 0; indices = 0; indices = 0;

min_x = pts_x; max_x = pts_x; min_y = pts_y; max_y = pts_y;

for(var i=0;i max_x) { indices = i; max_x = pts_x[i]; }

if(pts_y[i] < min_y) { indices = i; min_y = pts_y[i]; }

if(pts_y[i] > max_y) { indices = i; max_y = pts_y[i]; } }

/*var num = 100; var du = 1.0 / (num-1); var u = 0.0; for(var i=0; i1.0) u = 1.0;

var pt = evaluate(u, i);

render_x[i] = pt; render_y[i] = pt; }*/ }

function init() { var canvas = document.getElementById(“canvas”); ctx = canvas.getContext(“2d”); get_render_lines(); canvas.addEventListener(‘mousemove’, mouseMove, false); canvas.addEventListener(‘mouseup’, mouseUp, false);

draw(); }

function draw() { ctx.fillStyle = “rgba(0, 10, 30, 1)”; ctx.fillRect(0, 0, 400, 400);

ctx.fillStyle = “rgba(200, 100, 10, 0.8)”; ctx.fillRect(mouse_x-10, mouse_y-10, 10, 10);

if(degree > 1) { ctx.moveTo(pts_x, pts_y); ctx.fillStyle = ‘#00f’; ctx.strokeStyle = “rgba(230, 220, 250, 0.2)”; ctx.lineWidth = 1; ctx.beginPath(); for(var i=0; i