Javascript 获取矩形的坐标
我想添加4个文本框,这将给我一个矩形的坐标,如果我手动编辑坐标,它应该改变/改变矩形以及。 请告诉我如何继续这个解决方案 在我的示例中,如果单击ROI,它将绘制一个矩形,我希望上下X和Y坐标相同 这把小提琴正在演奏Javascript 获取矩形的坐标,javascript,jquery,css,Javascript,Jquery,Css,我想添加4个文本框,这将给我一个矩形的坐标,如果我手动编辑坐标,它应该改变/改变矩形以及。 请告诉我如何继续这个解决方案 在我的示例中,如果单击ROI,它将绘制一个矩形,我希望上下X和Y坐标相同 这把小提琴正在演奏 //对画布和上下文的引用 var oImageBuffer=document.createElement('img'); var oCanvas=document.getElementById(“SetupImageCanvas”); var o2DContext=oCanvas.g
//对画布和上下文的引用
var oImageBuffer=document.createElement('img');
var oCanvas=document.getElementById(“SetupImageCanvas”);
var o2DContext=oCanvas.getContext(“2d”);
//设置默认上下文状态
o2DContext.lineWidth=1;
o2DContext.translate(0.50,0.50);//用于更清晰线条的抗锯齿技巧
//保存用户图形的变量
var层=[];
var currentColor=“黑色”;
//用于拖动的变量
var bDragging=false;
var startX,startY;
//用户选择状态的变量
var$roiCheckbox=document.getElementById(“btnROI”);
var$layersCheckbox=document.getElementById(“btnLAYER”);
var$patches=document.getElementById('txtPatchCount');
var$mouse=document.getElementById(“MouseCoords”);
var Roischecked=假;
var layersIsChecked=false;
var-patchCount=0;
//侦听鼠标事件
oCanvas.addEventListener('mousedown',MouseDownEvent,false);
oCanvas.addEventListener('mouseup',MouseUpEvent,false);
oCanvas.addEventListener('mousemove',MouseMoveEvent,false);
oCanvas.addEventListener('mouseout',MouseOutEvent,false);
$(“#txtPatchCount”).keyup(函数(){
getStatus();
//清理画布
o2DContext.clearRect(0,0,oCanvas.width,oCanvas.height);
//重新绘制所有以前保存的线对和roi
对于(变量i=0;i0){
layer.patchCount=patchCount;
}
绘制(图层);
}
});
//鼠标事件处理程序
功能MouseDownEvent(e){
e、 预防默认值();
startX=e.clientX-this.offsetLeft;
startY=e.clientY-this.offsetTop;
currentColor=randomColor();
getStatus();
bDraging=true;
}
功能鼠标事件(e){
如果(!bDragging){
返回;
}
e、 预防默认值();
bDraging=false;
mouseX=e.clientX-this.offsetLeft;
mouseY=e.clientY-this.offsetTop;
推({
x1:startX,
y1:startY,
x2:mouseX,
y2:老鼠,
颜色:currentColor,
绘图机:图层已选中,
补丁数:补丁数,
});
}
功能MouseOutEvent(e){
MouseUpEvent(e);
}
功能MouseMoveEvent(e){
如果(!bDragging){
返回;
}
var mouseX=e.clientX-this.offsetLeft;
var mouseY=e.clientY-this.offsetTop;
//清理画布
o2DContext.clearRect(0,0,oCanvas.width,oCanvas.height);
//重新绘制所有以前保存的线对和roi
对于(变量i=0;i0){
//设置上下文状态
o2DContext.lineWidth=1.5;
o2DContext.strokeStyle='#0F0';
//绘制区域
o2DContext.strokeRect(layer.x1,layer.y1,(layer.x2-layer.x1),(layer.y2-layer.y1));
var w=layer.x2-layer.x1;
o2DContext.beginPath();
对于(变量i=1;i
好的,我回到绘图板,想出了这个
它提供div的尺寸及其从容器顶部和左侧的位置
你可以根据这些数字计算出精确的坐标
JS
@这不是一个重复的问题。我主要要坐标。我不会拖动它来调整大小。我想通过改变坐标来调整它的大小manually@GCyrillus那么我如何才能做到这一点呢?事实上,我只是想让协调的数据自动填充到画布中。画布的重新绘制不是一项优先任务(这是可选的)。几年前,我在wordpress插件中添加了一项调整图像大小的任务,现在我再也找不到源代码了。关键词是手柄拖动和调整大小。但是你可以在释放按钮上检索鼠标坐标。我想自动填充坐标,而不是根据坐标绘制。我正在使用鼠标移动事件绘制。我只想得到文本框中的坐标。
// references to canvas and context
var oImageBuffer = document.createElement('img');
var oCanvas = document.getElementById("SetupImageCanvas");
var o2DContext = oCanvas.getContext("2d");
// set default context states
o2DContext.lineWidth = 1;
o2DContext.translate(0.50, 0.50); // anti-aliasing trick for sharper lines
// vars to save user drawings
var layers = [];
var currentColor = "black";
// vars for dragging
var bDragging = false;
var startX, startY;
// vars for user-selected status
var $roiCheckbox = document.getElementById("btnROI");
var $layersCheckbox = document.getElementById("btnLAYER");
var $patches = document.getElementById('txtPatchCount');
var $mouse = document.getElementById("MouseCoords");
var roiIsChecked = false;
var layersIsChecked = false;
var patchCount = 0;
// listen for mouse events
oCanvas.addEventListener('mousedown', MouseDownEvent, false);
oCanvas.addEventListener('mouseup', MouseUpEvent, false);
oCanvas.addEventListener('mousemove', MouseMoveEvent, false);
oCanvas.addEventListener('mouseout', MouseOutEvent, false);
$("#txtPatchCount").keyup(function () {
getStatus();
// clear the canvas
o2DContext.clearRect(0, 0, oCanvas.width, oCanvas.height);
// redraw all previously saved line-pairs and roi
for (var i = 0; i < layers.length; i++) {
var layer = layers[i];
if (layer.patchCount > 0) {
layer.patchCount = patchCount;
}
draw(layer);
}
});
// mouse event handlers
function MouseDownEvent(e) {
e.preventDefault();
startX = e.clientX - this.offsetLeft;
startY = e.clientY - this.offsetTop;
currentColor = randomColor();
getStatus();
bDragging = true;
}
function MouseUpEvent(e) {
if (!bDragging) {
return;
}
e.preventDefault();
bDragging = false;
mouseX = e.clientX - this.offsetLeft;
mouseY = e.clientY - this.offsetTop;
layers.push({
x1: startX,
y1: startY,
x2: mouseX,
y2: mouseY,
color: currentColor,
drawLayer: layersIsChecked,
patchCount: patchCount,
});
}
function MouseOutEvent(e) {
MouseUpEvent(e);
}
function MouseMoveEvent(e) {
if (!bDragging) {
return;
}
var mouseX = e.clientX - this.offsetLeft;
var mouseY = e.clientY - this.offsetTop;
// clear the canvas
o2DContext.clearRect(0, 0, oCanvas.width, oCanvas.height);
// redraw all previously saved line-pairs and roi
for (var i = 0; i < layers.length; i++) {
draw(layers[i]);
}
// create a temporary layer+roi object
var tempLayer = {
x1: startX,
y1: startY,
x2: mouseX,
y2: mouseY,
color: currentColor,
drawLayer: layersIsChecked,
patchCount: patchCount,
};
// draw the temporary layer+roi object
draw(tempLayer);
// Display the current mouse coordinates.
$mouse.innerHTML = "(" + mouseX + "," + mouseY + ")" + patchCount;
}
function draw(layer) {
if (layer.drawLayer) {
// set context state
o2DContext.lineWidth = 0.50;
o2DContext.strokeStyle = layer.color;
// draw parallel lines
hline(layer.y1);
hline(layer.y2);
}
if (layer.patchCount > 0) {
// set context state
o2DContext.lineWidth = 1.5;
o2DContext.strokeStyle = '#0F0';
// draw regions
o2DContext.strokeRect(layer.x1, layer.y1, (layer.x2 - layer.x1), (layer.y2 - layer.y1));
var w = layer.x2 - layer.x1;
o2DContext.beginPath();
for (var i = 1; i < layer.patchCount; i++) {
var x = layer.x1 + i * w / layer.patchCount;
o2DContext.moveTo(x, layer.y1);
o2DContext.lineTo(x, layer.y2);
}
o2DContext.stroke();
}
}
function getStatus() {
roiIsChecked = $roiCheckbox.checked;
layersIsChecked = $layersCheckbox.checked;
patchCount = $patches.value;
if (!roiIsChecked || !patchCount) {
patchCount = 0;
}
}
function randomColor() {
return ('#' + Math.floor(Math.random() * 16777215).toString(16));
}
function hline(y) {
o2DContext.beginPath();
o2DContext.moveTo(0, y);
o2DContext.lineTo(oCanvas.width, y);
o2DContext.stroke();
}
var divwidth = $('.coord').width();
var divheight = $('.coord').height();
var pos = $('.coord').offset();
$('#divdimensions').html(divwidth + ',' + divheight);
$('#divposition').html( pos.left + ',' + pos.top );
document.getElementById("MouseCoords").innerHTML = "(" + x + "," + y + "); "
+"("+ oPixel.x + "," + oPixel.y + "); "
+"("+ oCanvasRect.left + "," + oCanvasRect.top + ")";
}