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问题描述
我需要缩放一个pdf,以便它填满屏幕的高度,但我找到的只是函数 scale()
。我怎么知道要缩放多少?
I need to scale a pdf so it fills the height of the screen, but all I've found is the function scale()
. How do i know how much to scale it?
推荐答案
要确定页面的宽度/高度,你需要这样做以下:
To determine the width/height of a page, you need to do the following:
-
获取页面
Get the page
promise功能(页面只能异步检索):
In a "promise" function (the page can only be retrieved asynchronously):
a。检索视口的比例为 1
a. Retrieve the viewport with a scale of 1
b。调用视口的 width
属性
代码:
//Get the page with your callback
pdf.getPage(1).then( function(page) {
//We need to pass it a scale for "getViewport" to work
var scale = 1;
//Grab the viewport with original scale
var viewport = page.getViewport( 1 );
//Here's the width and height
console.log( "Width: " + viewport.width + ", Height: " + viewport.height );
});
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