4.9 KiB
| title | order |
|---|---|
| Graphics Group | 8 |
Graphics Group (hereinafter referred to as Group) in G6 is similar to <g> tag in SVG: Group a container of a group of graphics. The transformations on a Group such as clipping, rotating, zooming, and translating will be applied to all the children of the Group. The attributes like color and position will also be inherited by its children. Besides, Group can be nested for complicated objects. For more information about Group, please refer to《Graphics Group》.
Instance Declaration
const group = new Group(cfgs);
Functions
addGroup(param, cfg)
Add a new group to the group.
Parameters
| Name | Type | Description |
|---|---|---|
| param | Function / Object / undefined | |
| cfg | Object |
Usage
group.addGroup({
id: 'groupId'
})
addShape(type, cfgs)
Add a new shape into the group
⚠️Attention: the clip and transform operations will affect all the shapes in the group. The graphics and their attributes are introduced in Shape。
Parameters
| Name | Type | Description |
|---|---|---|
| type | String | The type of the shape. Options: 'rect', 'circle', 'fan', 'ellipse', 'marker', 'image', and so on. Please refer to Shape and Their Attributes |
| cfg | Object | The configurations of the shape. |
Usage
group.addShape('rect', {
attrs: {
fill: 'red',
shadowOffsetX: 10,
shadowOffsetY: 10,
shadowColor: 'blue',
shadowBlur: 10,
opacity: 0.8
}
})
contain(child)
Whether the group contains the child.
The type of the return value: Boolean.
Parameters
| Name | Type | Description |
|---|---|---|
| child | Group / Shape | A sub group or an instance of shape. |
Usage
const has = group.contain(child)
find(fn)
Find the first element that matches the rule.
Parameters
| Name | Type | Description |
|---|---|---|
| fn | Function | Customized callback function. |
Usage
const child = group.find(function(item) {
return item.attr('fill') === 'red'; // Find the first graphics filled with red
});
findById(id)
Find the element by its id.
The type of the return value: Object。
Parameters
| Name | Type | Description |
|---|---|---|
| id | String | The id of the group. |
Usage
const group1 = group.findById('group1');
findAll(fn)
Find all the elements that match the rule.
The type of the return value: [ Object ]
Parameters
| Name | Type | Description |
|---|---|---|
| fn | Function | Customized callback function. |
Usage
const children = group.findAll(function(item) {
return item.get('id') < 10; // get all the elements with the id smaller than 10
});
getShape(x,y)
Get the top shape which is on (x, y).
The type of the return value: Object
Parameters
| Name | Type | Description |
|---|---|---|
| x | number | x coordinate |
| y | number | y coordinate |
Usage
// Get the top element on (10, 30)
const element = group.getShape(10, 30)
getFirst()
Get the first element of the group.
The type of the return value: Object
Usage
const child = group.getFirst()
// Equal to
const childrens = group.get('children')
const child = childrens[0]
getLast()
Get the last element of the group.
The type of the return value: Object
Usage
const child = group.getLast()
// Equal to
const childrens = group.get('children')
const child = childrens[childrens.length - 1]
getChildByIndex(index）
Get the index-th child of the group started from 0.
The type of the return value: Object
Parameters
| Name | Type | Description |
|---|---|---|
| index | number | The index of the child. 0 by default. |
Usage
const child = group.getChildByIndex(2)
removeChild(child)
Remove a group or a graphics from the group.
Parameters
| Name | Type | Description |
|---|---|---|
| child | Group / Shape | A sub group or an instance of Shape. |
Usage
group.removeChild(child)
sort()
Sort method.
In general, it is called for ordering the children of the group.
Typical scenerio: we set index for each shape when add shape by group.addShape(). After adding, sort the shapes by calling group.sort().
Usage
group.sort()
clear()
Clear all the children in the group.
Usage
group.clear()