Html PhoneGap 应用程序上的屏幕分辨率
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Screen Resolution On A PhoneGap App
提问by Miko Diko
I'm writing a Phonegap (3.2) app, I take a HTML5 canvas, make it full screen and the whole app UI is on this canvas.
我正在编写一个 Phonegap (3.2) 应用程序，我使用一个 HTML5 画布，使其全屏显示，整个应用程序 UI 都在这个画布上。
Using a Samsung Galaxy S4 (Android 4.3) to test the app, the screen resolution of the app is only 360X640 and not 1080X1920 like I want it to be.
使用三星 Galaxy S4 (Android 4.3) 测试该应用程序，该应用程序的屏幕分辨率仅为 360X640 而不是我想要的 1080X1920。
What is needed to be done in-order to make the app use the maximum possible screen resolution ?
需要做什么才能使应用程序使用最大可能的屏幕分辨率？
I've added screen shots 1) // Looks OK but bad resolution
我添加了屏幕截图 1) // 看起来不错，但分辨率很差
windowWidth = window.innerWidth;
windowHeight = window.innerHeight;
windowWidth = window.innerWidth; windowHeight = window.innerHeight;
2) // Takes small part of the screen, rest is white
2) // 占屏幕的一小部分，其余部分为白色
windowWidth = window.outerWidth;
windowHeight = window.outerHeight;
windowWidth = window.outerWidth; windowHeight = window.outerHeight;
3) // Only a small part of the picture is visible, as if the image is at 1080X1920 but the screen is 'too small' for it.
3) // 只有一小部分图片是可见的，好像图像是在 1080X1920 处，但屏幕对它来说“太小”了。
windowWidth = screen.width;
windowHeight = screen.height;
windowWidth = screen.width; windowHeight = screen.height;
and here is the full code:
这是完整的代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>PhoneGapTesting</title>
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript" charset="utf-8" src="cordova.js"></script>
<!-- -->
<script type="text/javascript">
var windowWidth;
var windowHeight;
var canvasMain;
var contextMain;
var backgroundImage;
$(document).ready(function() {
windowWidth = window.innerWidth;
windowHeight = window.innerHeight;
//windowWidth = window.outerWidth; // Only 'window.innerWidth' + 'window.innerHeight' look OK but not max resolution
//windowHeight = window.outerHeight;
//windowWidth = screen.width;
//windowHeight = screen.height;
canvasMain = document.getElementById("canvasSignatureMain");
canvasMain.width = windowWidth;
canvasMain.height = windowHeight;
contextMain = canvasMain.getContext("2d");
backgroundImage = new Image();
backgroundImage.src = 'img/landscape_7.jpg';
backgroundImage.onload = function() {
contextMain.drawImage(backgroundImage, 0, 0, backgroundImage.width, backgroundImage.height, 0, 0, canvasMain.width, canvasMain.height);
};
$("#canvasSignatureMain").fadeIn(0);
})
</script>
</head>
<body scroll="no" style="overflow: hidden">
<center>
<div id="deleteThisDivButNotItsContent">
<canvas id="canvasSignatureMain" style="border:1px solid #000000; position:absolute; top:0;left:0;"></canvas><br>
</div>
</center>
</body>
</html>
Thanks.
谢谢。
回答by Miko Diko
A solution that is working with both resolution and touch event issue (that came with Ken's post):
一个同时解决分辨率和触摸事件问题的解决方案（Ken 的帖子随附）：
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width, height=device-height, target-densitydpi=device-dpi" />
In the < head >
在 < 头 >
Thanks Ken for trying to help bro :))
感谢肯试图帮助兄弟 :))
回答by Miko Diko
Try something like this:
尝试这样的事情：
var windowWidth = window.innerWidth;
var windowHeight = window.innerHeight;
var pixelRatio = window.devicePixelRatio || 1; /// get pixel ratio of device
canvasMain = document.getElementById("canvasSignatureMain");
canvasMain.width = windowWidth * pixelRatio; /// resolution of canvas
canvasMain.height = windowHeight * pixelRatio;
canvasMain.style.width = windowWidth + 'px'; /// CSS size of canvas
canvasMain.style.height = windowHeight + 'px';
(or an absolute value for the css rule).
（或 css 规则的绝对值）。
On devices where the pixel ratio is higher than the typical 1:1 you get a higher resolution canvas. For normal circumstances everything is as normal.
在像素比高于典型 1:1 的设备上，您将获得更高分辨率的画布。在正常情况下，一切都是正常的。
回答by Victor Stoddard
window.innerWidthand window.innerHeightdon't necessarily give you the real screen dimensions.
window.innerWidth并且window.innerHeight不一定给你真实的屏幕尺寸。
Try this instead:
试试这个：
windowWidth = window.screen.innerWidth;
windowHeight = window.screen.innerHeight;
target-densitydpiin the meta tag in Miko's post is deprecated in Chrome and should not be used.
target-densitydpi在 Miko 帖子中的元标记中，Chrome 已弃用，不应使用。
Instead, try the following:
相反，请尝试以下操作：
index.html:
索引.html：
<meta name="viewport" content="initial-scale=1 maximum-scale=1 user-scalable=0 minimal-ui" />
You should also consider using Phaser's methods for scaling, like this:
您还应该考虑使用 Phaser 的缩放方法，如下所示：
Boot.js:
启动.js：
var game = new Phaser.Game(1080, 1920, Phaser.CANVAS, ''); //or AUTO mode for WebGL/DOM
For performance, use the smallest dimensions that you can regardless of the device's resolution. Let Phaser create the canvas object.
为了性能，无论设备的分辨率如何，都尽可能使用最小的尺寸。让 Phaser 创建画布对象。
Game.js:
游戏.js：
this.scale.scaleMode = Phaser.ScaleManager.EXACT_FIT; //or SHOW_ALL or RESIZE
this.scale.pageAlignHorizontally = true;
this.scale.pageAlignVertically = true;
Your entire canvas will scale automatically by the ScaleManager, but this slows the app down when performance is needed -- especially with a large canvas. EXACT_FIT will stretch the canvas, while SHOW_ALL will resize it so that the whole canvas fits onto the screen without changing its aspect ratio (which can leave margins like the one you have).
您的整个画布将通过 ScaleManager 自动缩放，但这会在需要性能时减慢应用程序的速度——尤其是使用大画布时。EXACT_FIT 将拉伸画布，而 SHOW_ALL 将调整它的大小，以便整个画布适合屏幕而不改变其纵横比（这可以像您拥有的那样留下边距）。
