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我應該可以在圖片上繪製並保存它。我想知道是否有可能讓用戶只繪製地圖(形狀)? 這裏是complate代碼: http://codepen.io/anon/pen/VYOXRW在HTML5畫布上繪製並保留更改
var ctx, color = '#FF0000';
document.addEventListener("DOMContentLoaded", function() {
setTimeout(function() {
newCanvas();
}, 1000);
}, false);
function newCanvas() {
document.getElementById("content").style.height = window.innerHeight + 100;
var canvas = '<canvas id="canvas" width="' + window.innerWidth + '" height="' + (window.innerHeight + 50) + '"></canvas>';
document.getElementById("content").innerHTML = canvas;
ctx = document.getElementById("canvas").getContext("2d");
ctx.strokeStyle = color;
ctx.lineWidth = 10;
var image = new Image();
image.src = 'http://4.bp.blogspot.com/-_laBnztzAG8/Ub7mDK4Z3qI/AAAAAAAABu4/LBPUeAVeJcc/s1600/CA+KATHMANDU+VALLEY_HU.png';
image.onload = function() {
var canvas = document.getElementById("canvas");
var iWidth = image.width/3;
var iHeight = image.height/3;
ctx.drawImage(image, (canvas.width - iWidth)/2, (canvas.height - iHeight)/2, iWidth, iHeight);
};
drawTouch();
drawMouse();
}
function selectColor(el) {
color = window.getComputedStyle(el).color;
ctx.beginPath();
ctx.strokeStyle = color;
}
var drawTouch = function() {
var start = function(e) {
ctx.beginPath();
x = e.changedTouches[0].pageX;
y = e.changedTouches[0].pageY;
ctx.moveTo(x, y);
};
var move = function(e) {
e.preventDefault();
x = e.changedTouches[0].pageX;
y = e.changedTouches[0].pageY;
ctx.lineTo(x, y);
ctx.stroke();
};
document.getElementById("canvas").addEventListener("touchstart", start, false);
document.getElementById("canvas").addEventListener("touchmove", move, false);
};
var drawMouse = function() {
var clicked = 0;
var start = function(e) {
clicked = 1;
ctx.beginPath();
x = e.pageX;
y = e.pageY;
ctx.moveTo(x, y);
};
var move = function(e) {
if (clicked) {
x = e.pageX;
y = e.pageY;
ctx.lineTo(x, y);
ctx.stroke();
}
};
var stop = function(e) {
clicked = 0;
};
document.getElementById("canvas").addEventListener("mousedown", start, false);
document.getElementById("canvas").addEventListener("mousemove", move, false);
document.addEventListener("mouseup", stop, false);
};
function saveBtn() {
console.log(document.getElementById('canvas').toDataURL());
}
請不要在一個問兩個問題。當你有兩個不相關的問題時,請單獨詢問。這對你也有好處,因爲這樣你不僅能從可以回答這兩個問題的人那裏得到答案。我自由地刪除了我無法回答的問題。您可以檢索我從編輯歷史記錄中刪除的文本,並將其作爲新問題發佈。 – Philipp