python4astronomers.github.com/contest/bounce.html at master · python4astronomers/python4astronomers.github.com

History

508 lines (460 loc) · 21.8 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>CONTEST: Make a fun bouncing balls demo — Python4Astronomers 2.0 documentation</title>

var DOCUMENTATION_OPTIONS = {

URL_ROOT: '../',

VERSION: '2.0',

COLLAPSE_INDEX: false,

FILE_SUFFIX: '.html',

HAS_SOURCE: true

};

</script>

$(document).ready(function(){

$(".flip0").click(function(){

$(".panel0").slideToggle("normal");

});

$(".flip1").click(function(){

$(".panel1").slideToggle("normal");

});

$(".flip2").click(function(){

$(".panel2").slideToggle("normal");

});

$(".flip3").click(function(){

$(".panel3").slideToggle("normal");

});

$(".flip4").click(function(){

$(".panel4").slideToggle("normal");

});

$(".flip5").click(function(){

$(".panel5").slideToggle("normal");

});

$(".flip6").click(function(){

$(".panel6").slideToggle("normal");

});

$(".flip7").click(function(){

$(".panel7").slideToggle("normal");

});

$(".flip8").click(function(){

$(".panel8").slideToggle("normal");

});

$(".flip9").click(function(){

$(".panel9").slideToggle("normal");

});

</script>

div.panel0,p.flip0

{

font-size: 0.9em;

margin: 0;

padding: 0.1em 0 0.1em 0.5em;

border-bottom: 1px solid #86989B;

}

p.flip0

{

color: white;

font-weight: bold;

background-color: #AFC1C4;

}

div.panel0

{

display:none;

}

div.panel1,p.flip1

{

font-size: 0.9em;

margin: 0;

padding: 0.1em 0 0.1em 0.5em;

border-bottom: 1px solid #86989B;

}

p.flip1

{

color: white;

font-weight: bold;

background-color: #AFC1C4;

}

div.panel1

{

display:none;

}

div.panel2,p.flip2

{

font-size: 0.9em;

margin: 0;

padding: 0.1em 0 0.1em 0.5em;

border-bottom: 1px solid #86989B;

}

p.flip2

{

color: white;

font-weight: bold;

background-color: #AFC1C4;

}

div.panel2

{

display:none;

}

div.panel3,p.flip3

{

font-size: 0.9em;

margin: 0;

padding: 0.1em 0 0.1em 0.5em;

border-bottom: 1px solid #86989B;

}

p.flip3

{

color: white;

font-weight: bold;

background-color: #AFC1C4;

}

div.panel3

{

display:none;

}

div.panel4,p.flip4

{

font-size: 0.9em;

margin: 0;

padding: 0.1em 0 0.1em 0.5em;

border-bottom: 1px solid #86989B;

}

p.flip4

{

color: white;

font-weight: bold;

background-color: #AFC1C4;

}

div.panel4

{

display:none;

}

div.panel5,p.flip5

{

font-size: 0.9em;

margin: 0;

padding: 0.1em 0 0.1em 0.5em;

border-bottom: 1px solid #86989B;

}

p.flip5

{

color: white;

font-weight: bold;

background-color: #AFC1C4;

}

div.panel5

{

display:none;

}

div.panel6,p.flip6

{

font-size: 0.9em;

margin: 0;

padding: 0.1em 0 0.1em 0.5em;

border-bottom: 1px solid #86989B;

}

p.flip6

{

color: white;

font-weight: bold;

background-color: #AFC1C4;

}

div.panel6

{

display:none;

}

div.panel7,p.flip7

{

font-size: 0.9em;

margin: 0;

padding: 0.1em 0 0.1em 0.5em;

border-bottom: 1px solid #86989B;

}

p.flip7

{

color: white;

font-weight: bold;

background-color: #AFC1C4;

}

div.panel7

{

display:none;

}

div.panel8,p.flip8

{

font-size: 0.9em;

margin: 0;

padding: 0.1em 0 0.1em 0.5em;

border-bottom: 1px solid #86989B;

}

p.flip8

{

color: white;

font-weight: bold;

background-color: #AFC1C4;

}

div.panel8

{

display:none;

}

div.panel9,p.flip9

{

font-size: 0.9em;

margin: 0;

padding: 0.1em 0 0.1em 0.5em;

border-bottom: 1px solid #86989B;

}

p.flip9

{

color: white;

font-weight: bold;

background-color: #AFC1C4;

}

div.panel9

{

display:none;

}

</style>

var _gaq = _gaq || [];

_gaq.push(['_setAccount', 'UA-18709417-2']);

_gaq.push(['_trackPageview']);

(function() {

var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;

ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';

var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);

})();

</script>

</head>

<a class="brand" title="Documentation Home" href="../index.html">python4astronomers</a>

<ul>

</ul>

</div>

<h3>Navigation</h3>

<ul>

</a>

</li>

« previous

</a>

</li>

<li>

<a href="../index.html">Python4Astronomers 2.0 documentation</a>

</li>

<li><a href="../plotting/plotting.html" accesskey="U">Plotting and Images</a> »</li>

<li>CONTEST: Make a fun bouncing balls demo</li>

</ul>

</div>

<h1>CONTEST: Make a fun bouncing balls demo<a class="headerlink" href="#contest-make-a-fun-bouncing-balls-demo" title="Permalink to this headline">¶</a></h1>

<dt>Contest:</dt>

<dd>Make the bouncing balls script more interesting.</dd>

<dt>Judging:</dt>

<dd>Submitted entries will be run during the Workshop and everyone will vote for the winner.</dd>

<dt>Prize:</dt>

<dd>FOR EXAMPLE: One-year subscription to Wired Magazine (US$10 value).</dd>

<dt>Submission:</dt>

<dd>Email your script as an attachment to workshop_organizer@institution.edu. To make

life easier please name the script “bounce_<yourname>.py” before

attaching.</dd>

<dt>Deadline:</dt>

<dd>The deadline for submission is TBD.</dd>

</dl>

<h2>Bouncing balls<a class="headerlink" href="#bouncing-balls" title="Permalink to this headline">¶</a></h2>

The script below shows a simple example of making an animation using

matplotlib. The key feature is the <a class="reference external" href="http://matplotlib.sourceforge.net/api/pyplot_api.html?highlight=pyplot.draw#matplotlib.pyplot.draw">draw()</a> command which re-draws the plot

window.

<div class="highlight-python"><div class="highlight"><pre>import numpy as np

import matplotlib.pyplot as plt

plt.figure(1)

plt.clf()

plt.axis([-10, 10, -10, 10])

# Define properties of the "bouncing balls"

n = 10

pos = (20 * np.random.sample(n*2) - 10).reshape(n, 2)

vel = (0.3 * np.random.normal(size=n*2)).reshape(n, 2)

sizes = 100 * np.random.sample(n) + 100

# Colors where each row is (Red, Green, Blue, Alpha). Each can go

# from 0 to 1. Alpha is the transparency.

colors = np.random.sample([n, 4])

# Draw all the circles and return an object ``circles`` that allows

# manipulation of the plotted circles.

circles = plt.scatter(pos[:,0], pos[:,1], marker='o', s=sizes, c=colors)

for i in range(100):

pos = pos + vel

bounce = abs(pos) > 10 # Find balls that are outside walls

vel[bounce] = -vel[bounce] # Bounce if outside the walls

circles.set_offsets(pos) # Change the positions

plt.draw()

plt.show()

</pre></div>

</div>

In order to run this you should copy the lines above into a file

called <code class="docutils literal">bounce.py</code> in your working directory. Then start IPython as usual

with <code class="docutils literal">ipython --matplotlib</code> or with the Pylab application on Windows and enter the following:

<div class="highlight-python"><div class="highlight"><pre>run -i bounce.py

</pre></div>

</div>

This command essentially runs the lines of the file as if you had entered them

by hand, but this now allows for longer scripts. This has the convenient

property that all the variables defined within the script are available at the

command line once the script finishes execution. Use this to examine key

variables like <code class="docutils literal">pos</code>, <code class="docutils literal">sizes</code>, <code class="docutils literal">colors</code> to understand how the script is

working.

The key plot routine being called is <a class="reference external" href="http://matplotlib.sourceforge.net/api/pyplot_api.html?highlight=pyplot.scatter#matplotlib.pyplot.scatter">scatter()</a>.

Read the documentation and understand how it is called.

Examine the <code class="docutils literal">circles</code> object with <code class="docutils literal">help</code> and <code class="docutils literal">?</code>. Look for “set_*”

methods (<code class="docutils literal">circles.set_<TAB></code>) that will let you set something and then get

help on those as well to learn how to use them. There are corresponding “get_*”

methods that let you examine the existing values.

</div>

<h2>Contest<a class="headerlink" href="#contest" title="Permalink to this headline">¶</a></h2>

Make the example script more interesting and visually stimulating!

Possibilities include:

<li>Change the colors and/or sizes dynamically</li>

<li>Use other shapes and make them spin</li>

<li>Add a lot more balls (at what point do things break?)</li>

<li>Put in animated text with the <a class="reference external" href="http://matplotlib.sourceforge.net/api/pyplot_api.html?highlight=pyplot.scatter#matplotlib.pyplot.text">text()</a>

command. You’ll need to do something like

<code class="docutils literal">mytext = text(...)</code> and then figure out how to change the properties of

the text (e.g. rotation angle) using <code class="docutils literal">mytext.get_<TAB></code> and <code class="docutils literal">mytext.set_<TAB></code> and <code class="docutils literal">help mytext</code>.</li>

<li>Do silly things like make the tick labels change colors and/or spin following the

example code at the end of the <a class="reference external" href="http://matplotlib.sourceforge.net/users/artists.html#axis-containers">Axis containers</a> documentation.</li>

<li>Put in physics, like making the balls bounce off each other, including gravity, or ???</li>

</ul>

</div>

<h2>Entries from CfA 2011 Workshops<a class="headerlink" href="#entries-from-cfa-2011-workshops" title="Permalink to this headline">¶</a></h2>

Below are the entries that were received for the contest. Thanks to all who submitted an entry!

</colgroup>

<tr class="row-odd"><td><a class="reference download internal" href="../_downloads/bounce_fprimini.py"><code class="xref download docutils literal">bounce_fprimini.py</code></a></td>

<td>Spinning pentagons</td>

</tr>

<tr class="row-even"><td><a class="reference download internal" href="../_downloads/bounce_jconnelly.py"><code class="xref download docutils literal">bounce_jconnelly.py</code></a></td>

<td>Order from chaos [*]</td>

</tr>

<tr class="row-odd"><td><a class="reference download internal" href="../_downloads/bounce_jslavin.py"><code class="xref download docutils literal">bounce_jslavin.py</code></a></td>

<td>1-d gravity [*]</td>

</tr>

<tr class="row-even"><td><a class="reference download internal" href="../_downloads/bounce_kkratter.py"><code class="xref download docutils literal">bounce_kkratter.py</code></a></td>

<td>Growing rings</td>

</tr>

<tr class="row-odd"><td><a class="reference download internal" href="../_downloads/bounce_mswanson.py"><code class="xref download docutils literal">bounce_mswanson.py</code></a></td>

<td>Whirling stars</td>

</tr>

<tr class="row-even"><td><a class="reference download internal" href="../_downloads/bounce_pgrigis.py"><code class="xref download docutils literal">bounce_pgrigis.py</code></a></td>

<td>Diffusion: contest winner</td>

</tr>

<tr class="row-odd"><td><a class="reference download internal" href="../_downloads/bounce_trobitaille1.py"><code class="xref download docutils literal">bounce_trobitaille1.py</code></a></td>

<td>Gravitational well [*]</td>

</tr>

<tr class="row-even"><td><a class="reference download internal" href="../_downloads/bounce_trobitaille2.py"><code class="xref download docutils literal">bounce_trobitaille2.py</code></a></td>

<td>Trailing images [*]</td>

</tr>

</tbody>

</table>

[*]: From a workshop organizer (not eligible for prize!)

</div>

<h2>Entries from CfA 2012 Workshops<a class="headerlink" href="#entries-from-cfa-2012-workshops" title="Permalink to this headline">¶</a></h2>

Below are the entries that were received for the contest. Thanks to all who submitted an entry!

</colgroup>

<tr class="row-odd"><td><a class="reference download internal" href="../_downloads/bounce_kpoppenhaeger.py"><code class="xref download docutils literal">bounce_kpoppenhaeger.py</code></a></td>

<td>balls and thorns</td>

</tr>

<tr class="row-even"><td><a class="reference download internal" href="../_downloads/bounce_krosenfeld.py"><code class="xref download docutils literal">bounce_krosenfeld.py</code></a></td>

<td>2d Metropolis-Hastings algorithm</td>

</tr>

<tr class="row-odd"><td><a class="reference download internal" href="../_downloads/bounce_xlu_just4fun.py"><code class="xref download docutils literal">bounce_xlu_just4fun.py</code></a></td>

<td>a flying dolphin</td>

</tr>

<tr class="row-even"><td><a class="reference download internal" href="../_downloads/bounce_xlu.py"><code class="xref download docutils literal">bounce_xlu.py</code></a></td>

<td>balls with gravity and elastic force</td>

</tr>

</tbody>

</table>

</div>

<div class="sphinxsidebarwrapper"><h3>Page Contents</h3>

<ul>

<li><a class="reference internal" href="#">CONTEST: Make a fun bouncing balls demo</a><ul>

<li><a class="reference internal" href="#bouncing-balls">Bouncing balls</a></li>

<li><a class="reference internal" href="#contest">Contest</a></li>

<li><a class="reference internal" href="#entries-from-cfa-2011-workshops">Entries from CfA 2011 Workshops</a></li>

<li><a class="reference internal" href="#entries-from-cfa-2012-workshops">Entries from CfA 2012 Workshops</a></li>

</ul>

</li>

</ul>

<h4>Previous topic</h4>

<a href="../plotting/aplpy.html"

title="previous chapter">APLpy</a>

<h4>Next topic</h4>

<a href="../plotting/advanced.html"

title="next chapter">Advanced plotting</a>

</div>

</div>

<a href="../_sources/contest/bounce.txt"

rel="nofollow">Page Source</a>

terms of <a rel="license"

href="http://creativecommons.org/licenses/by/3.0/">CC

Attribution 3.0</a>.

Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.3.1.

</footer>

</body>

</html>

pFad - Phone/Frame/Anonymizer/Declutterfier! Saves Data!

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Pfad - The Proxy pFad © 2024 Your Company Name. All rights reserved.

pFad - Phone/Frame/Anonymizer/Declutterfier! Saves Data!

FilesExpand file tree

bounce.html

Latest commit

History

bounce.html

File metadata and controls

Pfad - The Proxy pFad © 2024 Your Company Name. All rights reserved.