我已經檢查了將現有畫布克隆到另一個畫布的所有答案。但我無法完成。克隆一個畫布到另一個有問題
請檢查我目前的進度。 http://jsfiddle.net/37n8rtdf/5/
第一個畫布將被剪裁到您最初看到的那個正方形,並且該畫布的內容將被添加到另一個畫布中。但我不知道它總是會拋出鉻TYPE_MISMATCH_ERR: DOM Exception 171
。我正在使用fabricjs
剪輯內容。
讚賞有點幫助。
感謝
這裏是我的腳本代碼:
HTML
<textarea id="line_1"></textarea>
<input type="button" id="render" value="Apply" />
<input type="button" id="preview" value="preview" />
<canvas id="c" width="500" height="500" style="border:1px solid #ccc"></canvas>
<canvas id="c_new" width="500" height="500" style="border:1px solid red; margin: 30px;"></canvas>
`
的Javascript
var canvas = this.__canvas = new fabric.Canvas('c');
var canvas_new = this.__canvas = new fabric.Canvas('c_new');
var product_image = 'http://www.jail.se/hardware/digital_camera/canon/ixus_800is-powershot_sd700/images/sample_photos/sample3.jpg';
//var ctx = canvas.getContext("2d");
var polygon;
$(document).ready(function(){
fabric.Object.prototype.transparentCorners = false;
//canvas.setDimensions({width:w,height:h});
var center = canvas.getCenter();
canvas.setBackgroundImage(product_image,
canvas.renderAll.bind(canvas), {
scaleX:1,
scaleY:1,
top: center.top,
left: center.left,
originX: 'center',
originY: 'center',
backgroundImageOpacity: 0,
backgroundImageStretch: false
});
canvas_new.setBackgroundImage(product_image,
canvas_new.renderAll.bind(canvas_new), {
scaleX:1,
scaleY:1,
top: center.top,
left: center.left,
originX: 'center',
originY: 'center'
});
polygon = new fabric.Polygon([
{x: 0, y: 0},
{x: 220, y: 0},
{x: 220, y: 180},
{x: 0, y: 180} ], {
left: 140,
top: 150,
angle: 0,
fill: 'transparent',
stroke: '#000', strokeWidth: 1,
lockMovementX: true,
lockMovementY: true,
lockScalingX: true,
lockScalingY: true,
lockRotation: true,
hasControls: false,
hasBorders: false,
hoverCursor: 'default',
overflow: 'hidden'
});
canvas.add(polygon);
$('#render').click(function(){ return render(); });
$('#preview').click(function(){ return rasterize(); });
});
function render()
{
var text_val = $('#line_1').val();
var comicSansText = new fabric.Text(text_val, {
fontWeight: 'normal'
});
canvas.add(comicSansText.set({ left: 200, top: 150, angle: 0 }));
}
function rasterize()
{
var shape = canvas.item(0);
polygon.strokeWidth=0;
canvas.renderAll();
//canvas.remove(shape);
canvas.clipTo = function(ctx) {
shape.render(ctx);
};
var ctx2 = canvas_new.getContext('2d');
ctx2.drawImage(canvas, 0, 0);
}
`
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