var flip = function() {
var date = new Date(),delta = date.getTime()-startDate;
if(delta>=flipDuration) {
window.clearInterval(animationTimer);
if(sideLeft) {
images.unshift(images.pop());
patterns.unshift(patterns.pop());
} else {
images.push(images.shift());
patterns.push(patterns.shift());
}
mX = width;
mY = height;
draw();
flipping = false;
//init corner move if still in Canvas
if(inCanvas) {
startDate = new Date().getTime();
animationTimer = window.setInterval(cornerCurlIn,10);
c.triggerHandler("mousemove");
}
return;
}
//da mX a -width (mX+width) in duration millisecondi
mX = baseFlipX-2*(width)*delta/flipDuration;
mY = baseFlipY+2*(height)*delta/flipDuration;
draw();
},
cornerMove = function() {
var date = new Date(),delta = date.getTime()-startDate;
mX = basemX+Math.sin(Math.PI*2*delta/1000);
mY = basemY+Math.cos(Math.PI*2*delta/1000);
drawing = true;
window.setTimeout(draw,0);
},
cornerCurlIn = function() {
var date = new Date(),delta = date.getTime()-startDate;
if(delta>=curlDuration) {
window.clearInterval(animationTimer);
startDate = new Date().getTime();
animationTimer = window.setInterval(cornerMove,10);
}
mX = width-(width-basemX)*delta/curlDuration;
mY = basemY*delta/curlDuration;
draw();
},
cornerCurlOut = function() {
var date = new Date(),delta = date.getTime()-startDate;
if(delta>=curlDuration) {
window.clearInterval(animationTimer);
}
mX = basemX+(width-basemX)*delta/curlDuration;
mY = basemY-basemY*delta/curlDuration;
draw();
},
curlShape = function(m,q) {
//cannot draw outside the viewport because of IE blurring the pattern
var intyW = m*width+q,intx0 = -q/m;
if($.browser.msie) {
intyW = Math.round(intyW);
intx0 = Math.round(intx0);
};
ctx.beginPath();
ctx.moveTo(width,Math.min(intyW,height));
ctx.lineTo(width,0);
ctx.lineTo(Math.max(intx0,0),0);
if(intx0<0) {
ctx.lineTo(0,Math.min(q,height));
if(q<height) {
ctx.lineTo((height-q)/m,height);
}
ctx.lineTo(width,height);
} else {
if(intyW<height)
ctx.lineTo(width,intyW);
else {
ctx.lineTo((height-q)/m,height);
ctx.lineTo(width,height);
}
}
},
draw = function() {
if(!init) return;
if($.browser.msie)
ctx.clearRect(0,0,width,height);
ctx.fillStyle = background;
ctx.fillRect(0,0,width,height);
var img = images[0], r = $(img).data("flip.scale");
if($.browser.msie) {
ctx.fillStyle = patterns[0];
ctx.fillStyle.width2 = ctx.fillStyle.width*r;
ctx.fillStyle.height2 = ctx.fillStyle.height*r;
ctx.fillRect(0,0,width,height);
} else {
ctx.drawImage(img,(width-img.width*r)/2,(height-img.height*r)/2,img.width*r,img.height*r);
}
if(mY && mX!=width) {
var m = 2,
q = (mY-m*(mX+width))/2;
m2 = mY/(width-mX),
q2 = mX*m2;
if(m==m2) return;
var sx=1,sy=1,tx=0,ty=0;
ctx.save();
if(sideLeft) {
tx = width;
sx = -1;
}
if(!cornersTop) {
ty = height;
sy = -1;
}
ctx.translate(tx,ty);
ctx.scale(sx,sy);
//draw page flip
//intx,inty is the intersection between the line of the curl and the line
//from the canvas corner to the curl point
var intx = (q2-q)/(m-m2);
var inty = m*intx+q;
//y=m*x+mY-m*mX line per (mX,mY) parallel to the curl line
//y=-x/m+inty+intx/m line perpendicular to the curl line
//intersection x between the 2 lines = int2x
//y of perpendicular for the intersection x = int2y
//opera do not fill a shape if gradient is finished
var int2x = (2*inty+intx+2*m*mX-2*mY)/(2*m+1);
var int2y = -int2x/m+inty+intx/m;
var d = Math.sqrt(Math.pow(intx-int2x,2)+Math.pow(inty-int2y,2));
var stopHighlight = Math.min(d*0.5,30);
var c;
if(!($.browser.mozilla && parseFloat($.browser.version)<1.9)) {
c = ctx;
} else {
c = ctx2;
c.clearRect(0,0,width,height);
c.save();
c.translate(1,0); //the curl shapes do not overlap perfeclty
}
var gradient = c.createLinearGradient(intx,inty,int2x,int2y);
gradient.addColorStop(0, gradientColors[0]);
gradient.addColorStop(stopHighlight/d, gradientColors[1]);
gradient.addColorStop(1, gradientColors[2]);
c.fillStyle = gradient;
c.beginPath();
c.moveTo(-q/m,0);
c.quadraticCurveTo((-q/m+mX)/2+0.02*mX,mY/2,mX,mY);
c.quadraticCurveTo((width+mX)/2,(m*width+q+mY)/2-0.02*(height-mY),width,m*width+q);
if(!($.browser.mozilla && parseFloat($.browser.version)<1.9)) {
c.fill();
} else {
//for ff 2.0 use a clip region on a second canvas and copy all its content (much faster)
c.save();
c.clip();
c.fillRect(0,0,width,height);
c.restore();
ctx.drawImage(canvas2[0],0,0);
c.restore();
}
//can't understand why this doesn't work on ff 2, fill is slow
/*
ctx.save();
ctx.clip();
ctx.fillRect(0,0,width,height);
ctx.restore();
*/
gradient = null;
//draw solid color background
ctx.fillStyle = background;
curlShape(m,q);
ctx.fill();
//draw back image
curlShape(m,q);
//safari and opera delete the path when doing restore
if(!$.browser.safari && !$.browser.opera)
ctx.restore();
var img = sideLeft?images[images.length-1]:images[1];
r = $(img).data("flip.scale");
if($.browser.msie) {
//excanvas does not support clip
ctx.fillStyle = sideLeft?patterns[patterns.length-1]:patterns[1];
//hack to scale the pattern on IE (modified excanvas)
ctx.fillStyle.width2 = ctx.fillStyle.width*r;
ctx.fillStyle.height2 = ctx.fillStyle.height*r;
ctx.fill();
} else {
ctx.save();
ctx.clip();
//safari and opera delete the path when doing restore
//at this point we have not reverted the trasform
if($.browser.safari || $.browser.opera) {
//revert transform
ctx.scale(1/sx,1/sy);
ctx.translate(-tx,-ty);
}
ctx.drawImage(img,(width-img.width*r)/2,(height-img.height*r)/2,img.width*r,img.height*r);
//ctx.drawImage(img,(width-img.width)/2,(height-img.height)/2);
ctx.restore();
if($.browser.safari || $.browser.opera)
ctx.restore()
}
}
}
}
$.fn.jFlip = function(width,height,opts){
return this.each(function() {
$(this).wrap("<div class='flip_gallery'>");
var images = $(this).find("img");
//cannot hide because explorer does not give the image dimensions if hidden
var canvas = $(document.createElement("canvas")).attr({width:wi dth,height:height}).css({margin:0,width:width+"px" ,height:height+"px"})
$(this).css({position:"absolute",left:"-9000px",top:"-9000px"}).after(canvas);
new Flip($(this).next(),width || 852,height || 482,images,opts);
});
};
})(jQuery);
