Qt Quick 3D - 动态模型创建范例

演示动态模型的创建。

This example demonstrates creating models dynamically in an application. 10 models are created dynamically at the start of the application, and more can be added or removed using the Add Model and Remove Model 按钮。

设置

卵生节点

We are going to need a Node to hold the dynamically created models.

Node {
    id: shapeSpawner
    property real range: 300
    property var instances: []
    property int count
    ...

Startup

We're creating 10 models at Component.onCompleted so the example shows something at startup.

Component.onCompleted: {
    for (var i = 0; i < 10; ++i)
        shapeSpawner.addShape()
}

动态模型

添加模型

In order to add a new item to the scene, we first use the Qt.createComponent function to create a 组件 for our model. Then we use the component's createObject function to instantiate the item, passing in the position and scale as parameters.

function addShape()
{
    var xPos = (2 * Math.random() * range) - range;
    var yPos = (2 * Math.random() * range) - range;
    var zPos = (2 * Math.random() * range) - range;
    var shapeComponent = Qt.createComponent("WeirdShape.qml");
    let instance = shapeComponent.createObject(shapeSpawner,
        { "x": xPos, "y": yPos, "z": zPos, "scale": Qt.vector3d(0.25, 0.25, 0.25)});
    instances.push(instance);
    count = instances.length
}

移除模型

Dynamically created models are removed simply by popping and destroying them from the instance stack.

function removeShape()
{
    if (instances.length > 0) {
        let instance = instances.pop();
        instance.destroy();
        count = instances.length
    }
}

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