问题描述
我想弄清楚我做错了什么。我在引导模式中有一个 hmtl5 画布。画布是一种选择游戏,您可以在画布内选择对象并对其进行操作。
不幸的是,它在 600x600px 画布的中心工作正常,但是当我试图获取图片角落的坐标时,我得到了一个奇怪的偏移量。越靠近拐角,偏移量越大
这是我的代码。
在此先非常感谢您!
Javascript:
document.addEventListener('DOMContentLoaded',(ev) => {
canvas = document.getElementById('canvas');
ctx = canvas.getContext('2d');
canvas.width = 600;
canvas.height = 600;
let imgObj = new Image();
imgObj.onload = function() {
let w = canvas.width;
let nw = imgObj.naturalWidth; //1350
let nh = imgObj.naturalHeight; //900
console.log(nw);
console.log(nh);
let aspect = nw / nh;
let h = w / aspect;
console.log('height',h)
canvas.height = h;
soldTilesdisplay.textContent = totalTiles-soldTiles;
ctx.drawImage(imgObj,w,h);
rectangulize_with_IDs();
fillarraywithrandomTiles(soldTiles);
//greyscaleOriginal();
//ctx.drawImage(imgObj,dx,dy);
//ctx.drawImage(imgObj,dy,dw,dh);
//ctx.drawImage(imgObj,sx,sy,sw,sh,dh);
};
function getMousePosition(canvas,event) {
let rect = canvas.getBoundingClientRect();
let x = event.clientX - Math.floor(rect.left);
let y = event.clientY - Math.floor(rect.top);
storePixelArray(x,y); // originale "Store in Array funktion"
store_rect(x,y);
clickcounter = clickcounter + 1;
console.log("Exact Coordinates: X: " + x," Y: " + y,"CLick Counter: "+ clickcounter);
}
HTML:
<div>
<!-- Bootstrap Modal here!-->
<div class="row">
<div class="col-lg-4">
<!-- Bootstrap Modal here!-->
<div class="modal fade" id="myModal1">
<div class="modal-dialog modal-xl">
<div class="modal-content">
<div class="modal-header">
<h3>WIN!</h3>
</div>
<div class="modal-body">
<div class="container-fluid">
<div class="row">
<div class="col-md-6">
<canvas id="canvas" style="background-image: url('/images/Berge.png')"></canvas>
</div>
<div class="col-md-6 justify-content-center">
<div class="card text-center" style="width: 30rem;">
<div class="card-body">
<h5 class="card-title" id="Punktestand"> Card Title
score:
</h5>
<p class="card-text" id="paragraphImModal">With supporting
text below as a natural
lead-in to additional content.</p>
<button type="button" class="btn btn-default" id="usePointsPixelButton">
Select Pixel first</button>
<br>
<h5 class="selectedPixelAmount" id="AmountOfPixels"> </h5>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-primary btn-lg" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
</div>
</div>
解决方法
我在遇到同样的问题后发现了这个问题。 这是因为类 .modal-dialog 及其下的每个子类都有一个相对定位。只需将定位设置为 unset 即可获得正确的坐标。
就我而言,我不得不更改以下课程:
.modal-dialog {
position: unset;
}
.modal-content {
position: unset;
}
.modal-body {
position: unset;
}
.alert {
position: unset;
}
如果你愿意,你可以做一些 css 的东西,比如“只需改变模态对话框中模态主体的位置”,这样你就不会搞砸其他任何事情:)