javascript - drag constraints in raphael.js and zoom -


i've had no problem getting basic zoom/pan effect raphael.js 2.0 using pan :

set = ( // set of elements, contained in rectangle) var start = function () {         set.obb = set.getbbox(); }, move = function (dx, dy) {         var bb = set.getbbox();                 set.translate(set.obb.x - bb.x + dx, set.obb.y - bb.y + dy); }, = function() { // stuff }; set.drag(move, start, up);

and zoom :

//before  paper.setviewbox(0,0, 500,500, false); //after paper.setviewbox(0,0, 200, 200, false);

but i'm having 2 big problems this. raphael-created svg object , not image...

  • first, panning after zoom not 'smooth' : drag little , rectangle moves lot. movement gets worse farther go along. can scale drag somehow when have zoomed?
  • second, how arrange panning zoomed rectangle doesn't let me move out of viewport? in jquery constraint, , i've tried playing set.translate function above include constraints i'm getting nowhere...

any advice appreciated, or else library exists doing in raphael.js? looked @ raphael-spz doesn't seem address either of problems above.

what i'd http://dannyvankooten.com/demo/draggable-image-map-with-zoom/ raphael. he's using jquery ui draggable... can't seem work in raphael.

thanks!

because have scaled viewbox might need scale drag values well, fro calculating bounds can compare against viewport, like,

move = function (dx, dy) {         var bb = set.getbbox(),             //move relative viewport scale             x = dx/scale,             y = dy/scale,             //lower bounds             xf = math.max(0, set.obb.x - bb.x + x),             yf = math.max(0, set.obb.y - bb.y + y);          //upper bounds          xf = math.min(viewboxwidth, xf + bb.width) - bb.width;          yf = math.min(viewboxheight, yf + bb.height) - bb.height;           set.translate(xf, yf); }

scale being factor viewbox different relative paper. ie(200/500)


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