Javascript Fabric.js中断功能不起作用
我正在使用fabric js创建圆圈和箭头。如果我点击单选箭头按钮,我可以用鼠标画一个箭头,圆圈按钮也是如此 圆圈按钮工作正常,但如果我改为箭头按钮,它会给我画一个圆圈+箭头,我不明白为什么会发生这种情况 我的Html代码:Javascript Fabric.js中断功能不起作用,javascript,jquery,fabricjs,Javascript,Jquery,Fabricjs,我正在使用fabric js创建圆圈和箭头。如果我点击单选箭头按钮,我可以用鼠标画一个箭头,圆圈按钮也是如此 圆圈按钮工作正常,但如果我改为箭头按钮,它会给我画一个圆圈+箭头,我不明白为什么会发生这种情况 我的Html代码: <label class="btn btn-default btn-lg"> <input type="radio" name="drawing-shape" id="drawing-arrow-shape">
<label class="btn btn-default btn-lg">
<input type="radio" name="drawing-shape" id="drawing-arrow-shape">
<i class="glyphicon glyphicon-arrow-right"></i>
</label>
<label class="btn btn-default btn-lg">
<input type="radio" name="drawing-shape" id="drawing-circle-shape">
<i class="glyphicon glyphicon-record"></i>
</label>
var canvas=newfabric.canvas('canvas');
canvas.selection=false;
canvas.perPixelTargetFind=true;
var isDown,圆圈=空;
函数更改选择(){
canvas.selection!=canvas.selection;
changeSelectionObj(真);
取消注册事件();
}
函数unRegisterEvent(){
canvas.off('mouse:down',onCircleMouseDown);
canvas.off('mouse:move',onCircleMouseMove);
canvas.off('mouse:up',onCircleMouseUp);
canvas.off('mouse:down',onArrowMouseDown);
canvas.off('mouse:move',onArrowMouseMove);
canvas.off('mouse:up',onArrowMouseUp);
}
功能更改选择bj(val){
canvas.forEachObject(
功能(obj){
obj['selective']=val;
obj.setCoords();
});
canvas.renderAll();
}
函数drawArrow(){
canvas.off('mouse:down',onCircleMouseDown);
canvas.off('mouse:move',onCircleMouseMove);
canvas.off('mouse:up',onCircleMouseUp);
canvas.on('mouse:down',onArrowMouseDown);
canvas.on('mouse:move',onArrowMouseMove);
canvas.on('mouse:up',onArrowMouseUp);
changeSelectionObj(假);
}
函数drawCircle(){
on('mouse:down',onCircleMouseDown);
on('mouse:move',onCircleMouseMove);
canvas.on('mouse:up',onCircleMouseUp);
canvas.off('mouse:down',onArrowMouseDown);
canvas.off('mouse:move',onArrowMouseMove);
canvas.off('mouse:up',onArrowMouseUp);
changeSelectionObj(假);
}
函数onArrowMouseDown(o){
var pointer=canvas.getPointer(o.e);
startX=指针.x;
startY=pointer.y;
}
函数onArrowMouseUp(o){
var pointer=canvas.getPointer(o.e);
endX=指针.x;
endY=pointer.y;
显示箭头(startX、startY、endX、endY);
}
RorrowMouseMove(e)上的函数{
}
函数onCircleMouseDown(o){
isDown=真;
var pointer=canvas.getPointer(o.e);
origX=指针.x;
origY=pointer.y;
如果(!圈){
圆形=新织物。圆形({
左:origX,
上图:奥里基,
原文:“中心”,
原文:'中心',
半径:0,
填写:'',
笔划:“红色”,
冲程宽度:3,
可选:false
});
canvas.add(圆圈);
}
}
函数onCircleMouseMove(o){
如果(!isDown)返回;
var pointer=canvas.getPointer(o.e);
圆集({
半径:Math.sqrt(Math.pow((origX-pointer.x),2)+Math.pow((origY-pointer.y),2))
});
canvas.renderAll();
}
函数onCircleMouseUp(o){
isDown=假;
圆圈=空;
}
功能显示箭头(fromx、fromy、tox、toy){
变量角度=数学atan2(玩具-fromy,tox-fromx);
var headlen=15;//箭头大小
//将线端向后移动一些以说明箭头。
tox=tox-(头条)*数学cos(角度);
玩具=玩具-(头饰)*数学sin(角度);
//计算积分。
变量点=[{
x:fromx,//起点
y:弗洛米
}, {
x:fromx-(标题/4)*数学cos(角度-Math.PI/2),
y:fromy-(标题/4)*数学sin(角度-Math.PI/2)
}, {
x:tox-(headlen/4)*数学cos(angle-Math.PI/2),
y:玩具-(头条/4)*数学sin(角度-Math.PI/2)
}, {
x:tox-(标题)*数学cos(角度-数学PI/2),
y:玩具-(头条)*数学sin(角度-数学PI/2)
}, {
x:tox+(标题)*数学cos(角度),//提示
y:玩具+(头条)*数学正弦(角度)
}, {
x:tox-(头条)*数学cos(角度+数学PI/2),
y:玩具-(头条)*数学sin(角度+数学PI/2)
}, {
x:tox-(headlen/4)*数学cos(角度+数学PI/2),
y:玩具-(头条/4)*数学sin(角度+数学PI/2)
}, {
x:fromx-(标题/4)*数学cos(角度+数学PI/2),
y:fromy-(标题/4)*数学sin(角度+数学PI/2)
}, {
x:fromx,
y:弗洛米
}];
变量pline=新结构。多段线(点{
填充:“黑色”,
笔画:“黑色”,
不透明度:1,
冲程宽度:2,
原文:“左”,
原创:“top”,
可选:false
});
canvas.add(pline);
canvas.renderAll();
}
画布{
边框:2个点绿色;
}
挑选
箭头键
画圆圈
it因为您要将其添加到画布中的事件,所以要正确地管理它work@Durage我不太明白,请您进一步解释一下或解释一下您的意思好吗?canvas.on('mouse:down',function)
这将在您按下鼠标时一直听,而不仅仅是圆形或箭头,如果您定义了,那它就会一直在那里。所以要取消注册事件,您需要调用canvas.off('mouse:down',function)
drawingCircle.change = function() {
canvas.isCircleMode = true;
canvas.isArrowMode = false;
canvas.isDrawingMode = false;
if (canvas.isCircleMode) {
currentShapeName.innerHTML = 'Circle';
drawCircle(true);
drawArrow(false);
}
};
drawingArrow.change = function() {
canvas.isArrowMode = true;
canvas.isCircleMode = false;
canvas.isDrawingMode = false;
if (canvas.isArrowMode) {
currentShapeName.innerHTML = 'Arrow';
state = true;
drawCircle(false);
drawArrow(state, 100, 100, 150, 150);
if(state) {
var startX, startY, endX, endY;
canvas.on('mouse:down', function() {
var pointer = canvas.getPointer(event.e);
startX = pointer.x;
startY = pointer.y;
});
canvas.on('mouse:up', function() {
var pointer = canvas.getPointer(event.e);
endX = pointer.x;
endY = pointer.y;
drawArrow(true, startX, startY, endX, endY);
});
} else {
return;
}
}
};
function drawCircle(go) {
var circle, isDown, origX, origY;
if (go == false) {
console.log("circle false!!");
isDown = false;
return;
}
if($('#drawing-circle-shape').is(':checked')) {
console.log("circle checked");
canvas.on('mouse:down', function(o) {
isDown = true;
var pointer = canvas.getPointer(o.e);
origX = pointer.x;
origY = pointer.y;
circle = new fabric.Circle({
left: origX,
top: origY,
originX: 'left',
originY: 'top',
radius: pointer.x - origX,
angle: 0,
fill: '',
stroke: 'red',
strokeWidth: 3,
});
canvas.add(circle);
});
canvas.on('mouse:move', function(o) {
if (!isDown) return;
var pointer = canvas.getPointer(o.e);
var radius = Math.max(Math.abs(origY - pointer.y), Math.abs(origX - pointer.x)) / 2;
if (radius > circle.strokeWidth) {
radius -= circle.strokeWidth / 2;
}
circle.set({
radius: radius
});
if (origX > pointer.x) {
circle.set({
originX: 'right'
});
} else {
circle.set({
originX: 'left'
});
}
if (origY > pointer.y) {
circle.set({
originY: 'bottom'
});
} else {
circle.set({
originY: 'top'
});
}
canvas.renderAll();
});
canvas.on('mouse:up', function(o) {
isDown = false;
});
} else {
return;
}
}
function drawArrow(go, fromx, fromy, tox, toy) {
if (go == false) {
console.log("arrow false");
return;
}
if($('#drawing-arrow-shape').is(':checked')) {
var angle = Math.atan2(toy - fromy, tox - fromx);
var headlen = 15; // arrow head size
// bring the line end back some to account for arrow head.
tox = tox - (headlen) * Math.cos(angle);
toy = toy - (headlen) * Math.sin(angle);
// calculate the points.
var points = [{
x: fromx, // start point
y: fromy
}, {
x: fromx - (headlen / 4) * Math.cos(angle - Math.PI / 2),
y: fromy - (headlen / 4) * Math.sin(angle - Math.PI / 2)
}, {
x: tox - (headlen / 4) * Math.cos(angle - Math.PI / 2),
y: toy - (headlen / 4) * Math.sin(angle - Math.PI / 2)
}, {
x: tox - (headlen) * Math.cos(angle - Math.PI / 2),
y: toy - (headlen) * Math.sin(angle - Math.PI / 2)
}, {
x: tox + (headlen) * Math.cos(angle), // tip
y: toy + (headlen) * Math.sin(angle)
}, {
x: tox - (headlen) * Math.cos(angle + Math.PI / 2),
y: toy - (headlen) * Math.sin(angle + Math.PI / 2)
}, {
x: tox - (headlen / 4) * Math.cos(angle + Math.PI / 2),
y: toy - (headlen / 4) * Math.sin(angle + Math.PI / 2)
}, {
x: fromx - (headlen / 4) * Math.cos(angle + Math.PI / 2),
y: fromy - (headlen / 4) * Math.sin(angle + Math.PI / 2)
}, {
x: fromx,
y: fromy
}];
var pline = new fabric.Polyline(points, {
fill: 'black',
stroke: 'black',
opacity: 1,
strokeWidth: 2,
originX: 'left',
originY: 'top',
selectable: true
});
canvas.add(pline);
canvas.renderAll();
} else {
return;
}