-
Notifications
You must be signed in to change notification settings - Fork 4
/
Copy pathindex.html
175 lines (149 loc) · 5.45 KB
/
index.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="jquery-3.2.0.min.js"></script>
<script src="fabric.js"></script>
</head>
<body>
<canvas id="c"></canvas>
<button id="crop">裁剪</button>
<button id="startCrop" style="border:1px solid #000000;">框选裁剪区域</button>
<br>
<canvas style="visibility: hidden;" id="canvas_crop"></canvas>
</body>
<script>
var canvas = new fabric.Canvas('c', {
width: 500,
height: 400,
strokeWidth: 5,
stroke: 'rgba(100,200,200,0.5)'
});
var el;
var object, lastActive;
var selection_object_left = 0;
var selection_object_top = 0;
var isCropping = false;
$(document).ready(function() {
$('button#crop').hide();
img = new fabric.Image.fromURL('cat.jpg', function(img) {
img.set('selectable', true);
img.set('left', getObjLeft(img.getWidth()));
img.set('top', getObjTop(img.getHeight()));
img.crossOrigin = 'anonymous';
canvas.add(img);
canvas.selection = false;
canvas.renderAll();
});
});
$('#crop').on('click', function(event) {
$('button#crop').hide();
if (!isCropping) {
alert("请先框选裁剪区域。");
return;
}
var left = el.left - object.left;
var top = el.top - object.top;
left *= 1;
top *= 1;
var width = el.width * 1;
var height = el.height * 1;
//将当前帧导出到一个新的canvas中并执行裁剪，在此期间暂停记录历史记录。
cropImage(object, el.left, el.top, parseInt(el.scaleY * height), parseInt(width * el.scaleX));
for (var i = 0; i < $("#layers li").length; i++) {
canvas.item(i).selectable = true;
}
disabled = true;
canvas.remove(object);
canvas.remove(canvas.getActiveObject());
lastActive = object;
canvas.renderAll();
isCropping = false;
});
$('#startCrop').on('click', function() {
$("button#crop").show();
canvas.remove(el);
if (canvas.getActiveObject()) {
if (canvas.getActiveObject().type == 'sprite') {
alert("所选对象不可裁剪。");
return;
}
object = canvas.getActiveObject();
if (lastActive !== object) {
console.log('different object');
} else {
console.log('same object');
}
if (lastActive && lastActive !== object) {
lastActive.clipTo = null;
}
//生成一个和待裁剪元素相同大小的矩形用于框选裁剪区域
el = new fabric.Rect({
fill: 'rgba(0,0,0,0)',
originX: 'left',
originY: 'top',
stroke: '#ccc',
//strokeDashArray: [2, 2],
strokWidth: 5,
//opacity: 1,
width: 1,
height: 1,
borderColor: '#36fd00',
cornerColor: 'green',
hasRotatingPoint: false,
selectable: true
});
el.left = canvas.getActiveObject().left;
selection_object_left = canvas.getActiveObject().left;
selection_object_top = canvas.getActiveObject().top;
el.top = canvas.getActiveObject().top;
el.width = canvas.getActiveObject().width * canvas.getActiveObject().scaleX;
el.height = canvas.getActiveObject().height * canvas.getActiveObject().scaleY;
canvas.add(el);
canvas.setActiveObject(el);
for (var i = 0; i < $("#layers li").length; i++) {
canvas.item(i).selectable = false;
}
} else {
alert("请选中一个元素。");
}
isCropping = true;
});
function cropImage(png, left, top, height, width) {
//将图片放进一个新的canvas中，经裁剪后导出一个新的图片。
//如果用户选框大于原图片，则将选框缩至原图片大小
if (top < png.top) {
height = height - (png.top - top);
top = png.top;
}
if (left < png.left) {
width = width - (png.left - left);
left = png.left;
}
if (top + height > png.top + png.height * png.scaleY)
height = png.top + png.height * png.scaleY - top;
if (left + width > png.left + png.width * png.scaleX)
width = png.left + png.width * png.scaleX - left;
var canvas_crop = new fabric.Canvas("canvas_crop");
fabric.Image.fromURL(canvas.toDataURL('png'), function(img) {
img.set('left', -left);
img.set('top', -top);
canvas_crop.add(img)
canvas_crop.setHeight(height);
canvas_crop.setWidth(width);
canvas_crop.renderAll();
fabric.Image.fromURL(canvas_crop.toDataURL('png'), function(croppedImg) {
croppedImg.set('left', left);
croppedImg.set('top', top);
canvas.add(croppedImg).renderAll();
});
});
}
function getObjLeft(objWidth) {
return canvas.getWidth() / 2 - objWidth / 2;
}
function getObjTop(objHeight) {
return canvas.getHeight() / 2 - objHeight / 2;
}
</script>
</html>