如何在数学钨创建2D（3D）动画与相机追随物体？ [英] How to create 2D (3D) animation in Wolfram Mathematica with the camera following the object?

问题描述

我有沿着轨迹移动的图形对象。我怎样才能使相机效仿的对象？

I have a graphical object which is moving along a trajectory. How can I make the camera follow the object?

推荐答案

由于这个问题询问2D，这里是如何在2D图形模拟摄像头。

Since the question asks about 2D, here's how you can emulate a camera in 2D Graphics.

首先，让我们的计算器favicon.ico的：

First, let's get the stackoverflow favicon.ico:

so = First@Import["http://sstatic.net/stackoverflow/img/favicon.ico"]

那么把这个部分重叠的圆的顶部，使相机通过调整按照图标周围的 PlotRange

Manipulate[Graphics[{
   Table[Circle[{j, 0}, i], {i, 0, 1, .1}, {j, {-.5, .5}}],
   Inset[so, pos, {0, 0}, .2]},
  PlotRange -> {{-.5, .5}, {-.5, .5}} + pos],
 {{pos, {0, 0}, ""}, {-1.4, -1}, {1.4, 1}, ControlPlacement -> Left}]

要展示它是如何工作（与出将到上述数学），我们需要制作动画。
本来我选择了一个变步长随机游走酒后=累加[RandomReal [{ - 1，.1}，{200，2}] ，但它是一个非predictable！因此，不是，我们做出的图标遵循 ABC 标志

To show how it works (with out putting the above into Mathematica), we need to animate it. Originally I chose a variable step random walk drunk = Accumulate[RandomReal[{-.1, .1}, {200, 2}]] but it was a unpredictable! So instead, we'll make the icon follow the ABC logo

drunk = Table[{1.5 Sin[t], Cos[3 t]}, {t, 0, 2 Pi, .1}];
Animate[Graphics[{
   Table[Circle[{j, 0}, i], {i, 0, 1, .1}, {j, {-.5, .5}}],
   Inset[so, drunk[[pos]], {0, 0}, .2]},
  PlotRange -> {{-.5, .5}, {-.5, .5}} + drunk[[pos]]],
 {pos, 1, Length[drunk], 1}]

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