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canvas3.html
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canvas3.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=0">
<meta name="renderer" content="webkit">
<title>Canvas 绘图</title>
<meta name="description" content="首页描述"/>
<meta name="keywords" content="首页关键词"/>
<meta name="author" content="Web Layout:amu"/>
<meta name="format-detection" content="telephone=no,date=no,address=no,email=no,url=no"/>
<link rel="stylesheet" href="./src/style/base.css">
<link rel="stylesheet" href="https://artskin.github.io/html-native-ui/assets/index.a9865689.css">
<style>
.canvas-layer{
position: relative;
}
input[type="color"]{
padding:0;
}
input[type="color" i]::-webkit-color-swatch-wrapper{
padding: 0;
}
input[type="color" i]::-webkit-color-swatch{
border: 0;
}
#tools{
display: flex;
}
canvas{
position: absolute;background: rgba(0,0,0,.1);left: 0;top: 0;
aspect-ratio: var(--imgRatio);
}
.canvas-layer img,.canvas-layer canvas{
width: 80%;
}
img{user-select: none;opacity: .4;}
#canvas{border: 1px red dashed;box-sizing: border-box;}
</style>
</head>
<body>
<div class="paper">
<h1>Canvas 绘制工具</h1>
<hr>
<div id='tools'>
<button value="rect">矩形</button>
<button value='line'>线段</button>
<input id="color" type="color" value="#cc0000" />
</div>
<div class="canvas-layer">
<img src="assets/images/map.png" alt="">
<canvas id="canvas"></canvas>
</div>
</div>
</body>
<script>
function $(val){
const prefix = val.substr(0,1)
if(prefix ==='.'){
return document.querySelectorAll(val)
} else if(prefix === '#'){
return document.getElementById(val.substring(1))
}else{
return document.querySelector(val)
}
}
function init(){
const bgMap = new Image()
bgMap.src = 'https://artskin.github.io/jsCase/assets/images/map.png'
bgMap.onload = (e)=>{
const img = e.target || e.path[0];
const originWidth = img.naturalWidth
const originHeight = img.naturalHeight
const imgRatio = `${originWidth}/${originHeight}`
canvas.style.cssText = `--imgRatio:${imgRatio}`
canvas.width = originWidth;
canvas.height = originHeight;
ratioW = originWidth/canvas.clientWidth;
ratioH = originHeight/canvas.clientHeight;
console.log(ratioH,ratioW)
//previewShap()
//previewPath()
}
}
init()
// canvas 矩形框集合
var rects=[];
function rectar(x,y,width,height){
this.x = x;
this.y = y;
this.width = width;
this.height = height;
this.isSelected = false;
}
function drawRect() {
// 清除画布，准备绘制
context.clearRect(0, 0, canvas.width, canvas.height);
// 遍历所有矩形框
console.log(rects)
for(var i=0; i<rects.length; i++) {
var rect = rects[i];
// 绘制矩形
context.strokeStyle="#FF0000";
context.strokeRect(rect.x,rect.y,rect.width,rect.height,rect.color);
if (rect.isSelected) {
context.lineWidth = 50;
}
else {
context.lineWidth = 10;
}
}
}
function addRandomRect(x=10,y=10,w=200,h=200) {
var x=x;
var y=y;
var width=w;
var height=h;
// 创建一个新的矩形对象
var rect=new rectar(x,y,width,height);
// 把它保存在数组中
rects.push(rect);
// 重新绘制画布
drawRect();
}
var SelectedRect;
var x1;
var y1;
var right=false;
var widthstart,widthend;
var heightstart,heightend;
function canvasClick(e) {
// 取得画布上被单击的点
console.log(e)
var clickX = e.pageX - canvas.offsetLeft;
var clickY = e.pageY - canvas.offsetTop;
// 查找被单击的矩形框
for(var i=rects.length-1; i>=0; i--) {
var rect = rects[i];
widthstart=rect.x;
widthend=rect.x+rect.width;
heightstart=rect.y;
heightend=rect.y+rect.height;
// 判断这个点是否在矩形框中
console.log(clickX,clickY,rect)
console.log(clickX>=widthstart,(clickX<(widthend-20)),(clickY>=heightstart),(clickY<(heightend-20)))
if ((clickX>=widthstart&&clickX<(widthend-20))&&(clickY>=heightstart)&&(clickY<(heightend-20))) {
console.log(clickX);
// 清除之前选择的矩形框
if (SelectedRect != null) SelectedRect.isSelected = false;
SelectedRect = rect;
x1=clickX-SelectedRect.x;
y1=clickY-SelectedRect.y;
//选择新圆圈
rect.isSelected = true;
// 使圆圈允许拖拽
isDragging = true;
//debugger
//更新显示
drawRect();
//停止搜索
return;
};
/*
设置拉伸的界限。
*/
// if ((clickX>=(widthend-20))&&(clickY>=(heightend-20)))
// {
// SelectedRect = rect;
// right=true;
// } //18-02-01改 if ((clickX>=(widthend-20)&&((clickX<=(widthend+20)))&&(clickY>=(heightend-20))&&(clickY>=(heightend+20))) { SelectedRect = rect; right=true; }
}
}
function dragRect(e) {
// 判断矩形是否开始拖拽
if (isDragging == true) {
// 判断拖拽对象是否存在
if (SelectedRect != null) {
// 取得鼠标位置
var x = e.pageX - canvas.offsetLeft;
var y = e.pageY - canvas.offsetTop;
// 将圆圈移动到鼠标位置
SelectedRect.x= x-x1;
SelectedRect.y= y-y1;
// 更新画布
drawRect();
}
}
//判断是否开始拉伸
if (right) {
//设置拉伸最小的边界
if ((e.pageX - canvas.offsetLeft-SelectedRect.x)>50) {
SelectedRect.width=e.pageX - canvas.offsetLeft-SelectedRect.x;
}
else {
SelectedRect.width=50;
}
console.log(SelectedRect.width);
if((e.pageY - canvas.offsetTop-SelectedRect.y)>50){
SelectedRect.height=e.pageY - canvas.offsetTop-SelectedRect.y;
} else {
SelectedRect.height=50;
}
drawRect();
}
};
var isDragging = false;
function stopDragging() {
isDragging = false;
right=false;
}
function clearCanvas() {
// 去除所有矩形
rects = [];
// 重新绘制画布.
drawCircles();
}
window.onload = function() {
canvas = document.getElementById("canvas");
context = canvas.getContext("2d");
canvas.onmousedown = canvasClick;
canvas.onmouseup = stopDragging;
canvas.onmouseout = stopDragging;
canvas.onmousemove =dragRect;
addRandomRect()
addRandomRect(200,200,100,100)
};
</script>
</html>