2.0.4 • Published 2 days ago

@antv/g-plugin-box2d v2.0.4

Weekly downloads
-
License
MIT
Repository
github
Last release
2 days ago

@antv/g-plugin-box2d

支持 Box2D 物理引擎（仅支持刚体）。2D 图形初始化后开始仿真，在任意时刻可以施加外力改变图形的位置和旋转角度。

运行时加载 WASM 方式使用，entry 使用 UMD：

目前使用 Box2D 2.4，参考文档：https://box2d.org/documentation/。

安装方式

创建插件并在渲染器中注册：

import { Plugin as PluginBox2D } from '@antv/g-plugin-box2d';
renderer.registerPlugin(new PluginBox2D());

在 2D 图形中使用相关物理属性：

new Circle({
    style: {
        rigid: 'dynamic', // 动态物体，参与受力计算
        density: 10, // 密度：10 千克/平方米
        r: 10, // 半径：对应物理世界中 10 米
    },
});

全局配置

全局物理世界配置。

gravity

重力，默认值为 [0, 100]

new PluginBox2D({
  gravity: [0, 10], // 物理世界中的重力
}),

timeStep

仿真时间间隔，默认值为 1/60

velocityIterations

默认值为 8

positionIterations

默认值为 3

图形物理属性

Box2D 使用如下物理单位：米、千克和秒。

https://box2d.org/documentation/mdd_1git_hub_box2d_docs_loose_ends.html#autotoc_md124

Box2D uses MKS (meters, kilograms, and seconds) units and radians for angles.

rigid

刚体类型：

  • static 静态物体，例如地面
  • dynamic 动态物体，计算受力
  • kinematic

density

密度，千克/平方米。静态物体为 0。

linearVelocity

线速度，默认值为 [0, 0]。

angularVelocity

角速度，默认值为 0。

gravityScale

重力因子，默认值为 1。 https://box2d.org/documentation/mdd_1git_hub_box2d_docs_dynamics.html#autotoc_md60

linearDamping

阻尼，默认值为 0。https://box2d.org/documentation/mdd_1git_hub_box2d_docs_dynamics.html#autotoc_md59

angularDamping

角阻尼，默认值为 0。https://box2d.org/documentation/mdd_1git_hub_box2d_docs_dynamics.html#autotoc_md59

fixedRotation

固定旋转角度，默认值为 false。https://box2d.org/documentation/mdd_1git_hub_box2d_docs_dynamics.html#autotoc_md62

bullet

默认值为 false。https://box2d.org/documentation/mdd_1git_hub_box2d_docs_dynamics.html#autotoc_md63

对物体施加外力

除了通过初始化参数进行仿真，在任意时刻都可以通过施加外力，改变物体的位置和旋转角度。

https://box2d.org/documentation/mdd_1git_hub_box2d_docs_dynamics.html#autotoc_md71

void b2Body::ApplyForce(const b2Vec2& force, const b2Vec2& point);
void b2Body::ApplyTorque(float torque);
void b2Body::ApplyLinearImpulse(const b2Vec2& impulse, const b2Vec2& point);
void b2Body::ApplyAngularImpulse(float impulse);

applyForce

const plugin = new PluginBox2D();
plugin.applyForce(circle, [0, 0], [0, 0]);

applyTorque

applyLinearImpulse

applyAngularImpulse

WIP 流体

使用 liquidfun：https://github.com/Birch-san/box2d-wasm/blob/c04514c040/README.md#alternative-distributions

antvg
box2d-wasmtslib@antv/g-lite
@infinitebrahmanuniverse/nolb-_antv@everything-registry/sub-chunk-71
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