基本的に、マウスを動かしてマウスの左ボタンを押したままにしている間、画像に虫眼鏡効果を作成したかったのです。しかし、それは私が絵をドラッグするように振る舞います。
mousemove または mousedown アクションを単独で使用すると完全に機能しますが、両方のアクションを追加したいです。
html:
<div class="magnify">
<div class="large"></div>
<img class="small" title="Halten Sie die linke Maustaste-Taste für einen genaueren Blick!" src="../../Content/pictures/mypicture.png" alt="mypicture.png" />
</div>
CSS:
/* Some CSS */
.magnify { position:relative; }
/* Lets create the magnifying glass */
.large { width:200px; height:200px; position:absolute; border-radius:100%;
/* Multiple box shadows to achieve the glass effect */
/* rgba(160, 195, 219, 0.85) = #a0c3db, rgba(73, 151, 205, 0.85) = #4997cd */
/* rgba(234, 243, 250, 0.85) = #eaf3fa, rgba(57, 136, 191, 0.85) = #3988bf */
box-shadow:0 0 0 9px rgba(73, 151, 205, 0.75),
0 0 7px 9px rgba(0, 0, 0, 0.25),
inset 0 0 40px 2px rgba(0, 0, 0, 0.25);
/* Lets load up the large image first */
background:url(/Content/pictures/mypicture.png) no-repeat;
/* hide the glass by default */
display:none; cursor:pointer;
}
/* To solve overlap bug at the edges during magnification */
.small { display:block; width:800px; border-radius:20px 20px 20px 20px; }
jquery:
var leftButtonDown = false;
$(document).ready(function ()
{ //define zero
var native_width = 0;
var native_height = 0;
//Now the mousemove function
$(".magnify").mousemove(function (e)
{
$(".magnify").bind('mousedown', function (en)
{
if (en.which === 1) { leftButtonDown = false; }
}).bind('mouseup', function (en)
{
if (en.which === 1) { leftButtonDown = true; }
})
if (leftButtonDown == true) {
//When the user hovers on the image, the script will first calculate
//the native dimensions if they don't exist. Only after the native dimensions
//are available, the script will show the zoomed version.
if (!native_width && !native_height) {
//This will create a new image object with the same image as that in .small
//We cannot directly get the dimensions from .small because of the
//width specified to 200px in the html. To get the actual dimensions we have
//created this image object.
var image_object = new Image();
image_object.src = $(".small").attr("src");
//This code is wrapped in the .load function which is important.
//width and height of the object would return 0 if accessed before
//the image gets loaded.
native_width = image_object.width;
native_height = image_object.height;
} else {
//x/y coordinates of the mouse
//This is the position of .magnify with respect to the document.
var magnify_offset = $(this).offset();
//We will deduct the positions of .magnify from the mouse positions with
//respect to the document to get the mouse positions with respect to the
//container(.magnify)
var mx = e.pageX - magnify_offset.left;
var my = e.pageY - magnify_offset.top;
//Finally the code to fade out the glass if the mouse is outside the container
if (mx < $(this).width() && my < $(this).height() && mx > 0 && my > 0) {
$(".large").fadeIn(100);
} else {
$(".large").fadeOut(100);
}
if ($(".large").is(":visible")) {
//The background position of .large will be changed according to the position
//of the mouse over the .small image. So we will get the ratio of the pixel
//under the mouse pointer with respect to the image and use that to position the
//large image inside the magnifying glass
var rx = Math.round(mx / $(".small").width() * native_width - $(".large").width() / 2) * -1;
var ry = Math.round(my / $(".small").height() * native_height - $(".large").height() / 2) * -1;
var bgp = rx + "px " + ry + "px";
//Time to move the magnifying glass with the mouse
var px = mx - $(".large").width() / 2;
var py = my - $(".large").height() / 2;
//Now the glass moves with the mouse
//The logic is to deduct half of the glass's width and height from the
//mouse coordinates to place it with its center at the mouse coordinates
//If you hover on the image now, you should see the magnifying glass in action
$(".large").css({ left: px, top: py, backgroundPosition: bgp });
}
}
} //endif leftButtonDown == true
})
})