Fabric JS:按下鼠标时复制/粘贴对象 [英] Fabric JS: Copy/paste object on mouse down
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问题描述
我正在尝试创建一个街机游戏,您可以从菜单中选择形状并将其放置在画布上.有一个形状菜单,您可以在其中将形状拖到画布上.我希望它在将克隆对象拖到画布上时将其主要形状保留在菜单中.这可能吗?我创建了一个jsfiddle来提供帮助.
I'm trying to create a block game where you select shapes from a menu and place them on the canvas. There is a shape menu where you can drag the shapes onto the canvas. I would like for it to leave the main shape in the menu as it drags a clone onto the canvas. Is this possible? I have created a jsfiddle to help.
window.canvas = new fabric.Canvas('fabriccanvas');
var edgedetection = 10; //pixels to snap
canvas.selection = false;
window.addEventListener('resize', resizeCanvas, false);
function resizeCanvas() {
canvas.setHeight(window.innerHeight);
canvas.setWidth(window.innerWidth);
canvas.renderAll();
}
// resize on init
resizeCanvas();
//Initialize Everything
init();
function init(top, left, width, height, fill) {
var bg = new fabric.Rect({
left: 0,
top: 0,
fill: "#eee",
width: window.innerWidth,
height: 75,
lockRotation: true,
maxHeight: document.getElementById("fabriccanvas").height,
maxWidth: document.getElementById("fabriccanvas").width,
selectable: false,
});
var squareBtn = new fabric.Rect({
top: 6,
left: 18,
width: 40,
height: 40,
fill: '#af3',
lockRotation: true,
originX: 'left',
originY: 'top',
cornerSize: 15,
hasRotatingPoint: false,
perPixelTargetFind: true,
});
var circleBtn = new fabric.Circle({
radius: 20,
fill: '#f55',
top: 6,
left: 105,
});
var triangleBtn = new fabric.Triangle({
width: 40,
height: 35,
fill: 'blue',
top: 10,
left: 190,
});
var sqrText = new fabric.IText("Add Square", {
fontFamily: 'Indie Flower',
fontSize: 14,
fontWeight: 'bold',
left: 6,
top: 50,
selectable: false,
});
var cirText = new fabric.IText("Add Circle", {
fontFamily: 'Indie Flower',
fontSize: 14,
fontWeight: 'bold',
left: 95,
top: 50,
selectable: false,
});
var triText = new fabric.IText("Add Triangle", {
fontFamily: 'Indie Flower',
fontSize: 14,
fontWeight: 'bold',
left: 175,
top: 50,
selectable: false,
});
var shadow = {
color: 'rgba(0,0,0,0.6)',
blur: 3,
offsetX: 0,
offsetY: 2,
opacity: 0.6,
fillShadow: true,
strokeShadow: true
}
window.canvas.add(bg);
bg.setShadow(shadow);
window.canvas.add(sqrText);
window.canvas.add(cirText);
window.canvas.add(triText);
window.canvas.add(squareBtn);
window.canvas.add(circleBtn);
window.canvas.add(triangleBtn);
canvas.forEachObject(function (e) {
e.hasControls = e.hasBorders = false; //remove borders/controls
});
this.canvas.on('object:moving', function (e) {
var obj = e.target;
obj.setCoords(); //Sets corner position coordinates based on current angle, width and height
canvas.forEachObject(function (targ) {
activeObject = canvas.getActiveObject();
if (targ === activeObject) return;
if (Math.abs(activeObject.oCoords.tr.x - targ.oCoords.tl.x) < edgedetection) {
activeObject.left = targ.left - activeObject.currentWidth;
}
if (Math.abs(activeObject.oCoords.tl.x - targ.oCoords.tr.x) < edgedetection) {
activeObject.left = targ.left + targ.currentWidth;
}
if (Math.abs(activeObject.oCoords.br.y - targ.oCoords.tr.y) < edgedetection) {
activeObject.top = targ.top - activeObject.currentHeight;
}
if (Math.abs(targ.oCoords.br.y - activeObject.oCoords.tr.y) < edgedetection) {
activeObject.top = targ.top + targ.currentHeight;
}
if (activeObject.intersectsWithObject(targ) && targ.intersectsWithObject(activeObject)) {
} else {
targ.strokeWidth = 0;
targ.stroke = false;
}
if (!activeObject.intersectsWithObject(targ)) {
activeObject.strokeWidth = 0;
activeObject.stroke = false;
activeObject === targ
}
});
});
}
推荐答案
请参见 Jsfiddle 在这里,我添加了执行此操作的功能.
See Jsfiddle here, I add the function to do this.
function draggable(object) {
object.on('mousedown', function() {
var temp = this.clone();
temp.set({
hasControls: false,
hasBorders: false,
});
canvas.add(temp);
draggable(temp);
});
object.on('mouseup', function() {
// Remove an event handler
this.off('mousedown');
// Comment this will let the clone object able to be removed by drag it to menu bar
// this.off('mouseup');
// Remove the object if its position is in menu bar
if(this.top<=75) {
canvas.remove(this);
}
});
}
draggable(squareBtn);
draggable(circleBtn);
draggable(triangleBtn);
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