我正在研究 2d 游戏的简单物理原理，我希望获得有关我正在尝试进行的模拟的帮助。
我有一个酒吧会落在地上的固定球上，xaml如下：
<Canvas Background="CornflowerBlue">
<Rectangle Name="bar" Width="200" Height="20" Fill="Cornsilk" Canvas.Left="250" Canvas.Top="50" />
<Ellipse Name="ball" Height="50" Width="50" Fill="PaleGreen" Canvas.Left="380" Canvas.Top="250" />
</Canvas>
我拥有所有进行的计算是为了模拟酒吧因重力而下落，但我真正需要帮助的是，一旦酒吧击中球，它的一侧将在地面上，另一侧将在球上方，这几乎可以用xaml:
<Canvas Background="CornflowerBlue">
<Rectangle Name="bar" Width="200" Height="20" Fill="Cornsilk" Canvas.Left="250" Canvas.Top="246.675" RenderTransformOrigin="0.5,0.5" >
<Rectangle.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform Angle="-18.897"/>
<TranslateTransform/>
</TransformGroup>
</Rectangle.RenderTransform>
</Rectangle>
<Ellipse Name="ball" Height="50" Width="50" Fill="PaleGreen" Canvas.Left="380" Canvas.Top="250" />
</Canvas>
我不知道如何让栏的左侧接触地面从物理学角度来说，左侧将在球上方。
我知道有像 Farseen 这样很棒的物理引擎，但我只是想了解它在这种情况下如何工作。
我知道如何根据时间获取酒吧的 Y 值，所以我不断检查它，直到它与球碰撞，但之后呢？
谢谢！
I'm studying simple physics for 2d games and I would like a help with a simulation I'm trying to do.
I have a bar that will fall over a fixed ball in the ground, xaml below:
<Canvas Background="CornflowerBlue">
<Rectangle Name="bar" Width="200" Height="20" Fill="Cornsilk" Canvas.Left="250" Canvas.Top="50" />
<Ellipse Name="ball" Height="50" Width="50" Fill="PaleGreen" Canvas.Left="380" Canvas.Top="250" />
</Canvas>
I have all the calculations done to simulate the bar falling due to gravity but what I really need help with is, once the bar hits the ball, it's gonna have one side in the ground and the other side over the ball, which could be pretty much represented with the xaml:
<Canvas Background="CornflowerBlue">
<Rectangle Name="bar" Width="200" Height="20" Fill="Cornsilk" Canvas.Left="250" Canvas.Top="246.675" RenderTransformOrigin="0.5,0.5" >
<Rectangle.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform Angle="-18.897"/>
<TranslateTransform/>
</TransformGroup>
</Rectangle.RenderTransform>
</Rectangle>
<Ellipse Name="ball" Height="50" Width="50" Fill="PaleGreen" Canvas.Left="380" Canvas.Top="250" />
</Canvas>
And I don't know how to make the left side of the bar hit the ground while the left side will be over the ball in phisics terms.
I know there are awesome physics engine available like Farseen but I just want to understand how it would work in this case.
I know how to get the bar's Y based on time, so I keep checking it until it colides with the ball, but then what after that?
Thanks!
发布评论
评论（1）
刚体物理模拟不是一项简单的任务，除非您对该主题非常感兴趣，否则我建议使用物理库。但如果您有兴趣这样做，我建议您查看 基于物理的建模 SIGGRAPH 课程笔记，Brian Mirtich 的论文关于基于脉冲的动力学，也许还有Kenny Erleben 的论文< /a> 多体动力学。
这些提供了如何实现刚体动力学的非常深入的描述。
Rigid Body physical simulation is not a simple task Unless you are very interested in the topic I would recommend using a physics library. But if you are interested in doing this I would recommend looking at the Physically Based Modeling SIGGRAPH course notes, Brian Mirtich's thesis on impulse based dynamics and perhaps also Kenny Erleben's thesis on multibody dynamics.
These provide a very in depth description of how rigid body dynamics can be implemented.