html5 - Drawing shape on canvas with relative size -


i have code draws circle. how change code red circle 100% of browser window? want red circle resize browser window.

  <canvas width="100%" height="100%"></canvas>     var ctx;      function draw() {      ctx = $('canvas').get(0).getcontext('2d');        ctx.canvas.width  = window.innerwidth;       ctx.canvas.height = window.innerheight;     }       function circle(x, y, r, c) {         ctx.beginpath();         var rad = ctx.createradialgradient(x, y, 1, x, y, r);         rad.addcolorstop(0, 'rgba('+c+',1)');         rad.addcolorstop(1, 'rgba('+c+',0)');         ctx.fillstyle = rad;         ctx.arc(x, y, r, 0, math.pi*2, false);         ctx.fill();     }       draw();       circle(128, 128, 200, '255,0,0');

consider jsfiddle

on load/resize:

create circle draw() setvars() circle(...)

draw() (which sets width/height of canvas) clear canvas (see: how clear canvas redrawing)

var ctx, canvas, x, y, w, h, r;  function draw() {     ctx = $('canvas').get(0).getcontext('2d');     canvas = ctx.canvas;     canvas.width = window.innerwidth;     canvas.height = window.innerheight; }  function setvars() {     w = canvas.width;     h = canvas.height;     x = w/2;     y = h/2;     r = x < y ? x : y; }  function circle(x, y, r, c) {     ctx.beginpath();     var rad = ctx.createradialgradient(x, y, 1, x, y, r);     rad.addcolorstop(0, 'rgba(' + c + ',1)');     rad.addcolorstop(1, 'rgba(' + c + ',0)');     ctx.fillstyle = rad;     ctx.arc(x, y, r, 0, math.pi * 2, false);     ctx.fill(); }  function makecircle() {     draw();     setvars();     circle(x, y, r, '255,0,0'); }  $(window).resize(function () {     // redraw (onresize)     makecircle(); });  // draw (onload) makecircle();

Comments

Post a Comment

Popular posts from this blog

c# - DetailsView in ASP.Net - How to add another column on the side/add a control in each row? -

i have detailsview control on page used edit various fields of record, works in respect. i looking way add 1 column (and if works, why not more) right, absolutely read-only, show same fields of record comparison purposes. i aware there no obvious way such thing out of box detailsview . have looked other controls (transposed gridview , recommended formview , listview ), nothing satisfies. have special data binding setup using detailsview , can't out of without losing features. anyone on how "hack in" additional columns (for display only) on detailsview ? the solution have now, use second detailsview , visible set false in aspx. in code, make sure databind hidden detailsview hosts data third column first, initial detailsview named itemdetails . and in item created event, pass third column html rendering of hidden controls (in last code block) : protected void itemdetails_itemcreated(object sender, eventargs e) { if (dataite
Read more

javascript - firefox memory leak -

i have following script (i use raphaeljs also) draws circle, waits 1 second, draws circle again, etc (you can copy paste - functional, need include raphael raphaeljs.com): <div id="holder"> </div> <script src="raphael.js" type="text/javascript"></script> <script> var paper = raphael(10, 50, 320, 200); var rad = math.pi / 180; var finangle = 0; function sector(cx, cy, r, startangle, endangle, params) { var x1 = cx + r * math.cos(-startangle * rad), x2 = cx + r * math.cos(-endangle * rad), y1 = cy + r * math.sin(-startangle * rad), y2 = cy + r * math.sin(-endangle * rad); return ["m", cx, cy, "l", x1, y1, "a", r, r, 0, +(endangle - startangle > 180), 0, x2, y2]; } var path = sector(100,100,50,0,180); var arc = paper.path(path); function draw() { path = sector(100,100,50,0,finangle);
Read more

Trying to import CSV file to a SQL Server database using asp.net and c# - can't find what I'm missing -

i student , quite new programming, , given task using asp.net , c#, without being taught either. plan learn teach ourselves. the task stuck on making website import csv file sql server database of last year's room bookings around campus. the table has following columns: request_id; priority; module_id; day; start_time; length; park; students; room_code; status; semester_id; linked_request; week_1; week_2; week_3; week_4; week_5; week_6; week_7; week_8; week_9; week_10; week_11; week_12; week_13; week_14; week_15; ) in code, try make work 3 columns (request_id,priority,module) starters. when press import button, want read .csv file (with fixed name @ fixed directory) eg "1,2,3" - comma separating fields [delimiter] - , import sql server datab
Read more