我在 canvas.clipTo 函数中使用 ctx.scale() 方法给出不同的画布形状。现在,当我在选择框中选择墙时,我想从画布中删除现有的剪切区域,我正在使用 fabric.js 有人知道如何解决这个问题吗?这是我的代码//html
<canvas id="c" width="632" height="485"></canvas>
<span class="tt1">DECAL SHAPE</span>
<select name="Decal Shape" id="clipingShape" style="height:30px;">
<option> WALL </option>
<option> CIRCLE </option>
<option> OVAL </option>
<option> HORIZONTAL RECTANGLE </option>
<option> VERTICAL RECTANGLE </option>
</select>
脚本//
var canvas = new fabric.Canvas('c');
$("#clipingShape").change(function(e){
var w;
var h;
var ctx = canvas.getContext('2d');
var shape =$('#clipingShape :selected').val();
canvas.backgroundColor = 'red';
if(shape=="WALL")
{
alert("how to remove cloping");
}
canvas.clipTo = function(ctx) {
if(shape=="OVAL")
{
w=canvas.width / 4;
h=canvas.height / 2.4;
ctx.save();
ctx.scale(2, 1.2);
ctx.arc(w, h, 155, 0, 2 * Math.PI, true);
}
if(shape=="CIRCLE")
{
w=canvas.width / 2;
h=canvas.height / 2;
ctx.save();
ctx.arc(w, h, 230, 0, Math.PI * 2,true); // Circle Shape
}
if(shape=="VERTICAL RECTANGLE")
{
w=canvas.width - 217;
h=canvas.height - 70;
//alert(w);
//alert(h);
ctx.save();
ctx.rect(110, 35, w, h);
}
if(shape=="HORIZONTAL RECTANGLE")
{
w=canvas.width - 100;
h=canvas.height - 100;
ctx.save();
ctx.rect(50, 50, w, h);
}
if(shape=="WALL")
{
w=canvas.width - 100;
h=canvas.height - 100;
ctx.save();
ctx.clear();
}
ctx.stroke();
ctx.restore();
};
canvas.renderAll();
});
// canvas.renderAll();
var text;
text = new fabric.Text('Honey', {
fontSize: 50,
left: 100,
top: 100,
lineHeight: 1,
originX: 'left',
fontFamily: 'Helvetica',
fontWeight: 'bold'
});
canvas.add(text);
这是我的小提琴演示