skellt

skellt

Apple Game Frameworks and Technologies: Misleading explanation of gloop end pos (p 62)

On page 62, right after the code snippet for func drop(dropSpeed: TimeInterval, floorLevel: CGFloat), is this line:

Here, you’re setting the initial position of the drop.

As the first explanatory line of text following the method it appears to be referring to the first line of code in the method: let pos = CGPoint(x: position.x, y: floorLevel). But this line is not setting the initial position of the drop. It is setting the end position of the drop to which it will animate. The drop starts up at the top of the screen and animates down to floorLevel.

The initial position of the drop is set elsewhere in spawnGloop(), which then calls drop.

Marked As Solved

Paradox927

Paradox927

Author and Editor at PragProg

Hi, David.

Thank you for pointing this out. I’ve updated the explanation, which will be made available in the next release.

However, for those reading now, the updated explanation reads as follows:

Here, you’re setting the end position of the drop; in other words, where you want the drop to land.

I also expanded the step-by-step that goes along with it—the updates noted in bold text:

  • First, you set the y-position using the input value stored in floorLevel.
  • Then, you add two scale actions to make the drop stretch a little; this gives it a drip-like > appearance.
  • Next, you create actions to fade-in and move the drop down the scene.
  • Finally, for some more visual appeal, you tweak the scale of the drop, and then run this sequence of actions. You give it a named key so that you can access this action later using its name.

Again, thanks for the feedback.

Where Next?

Popular Pragmatic Bookshelf topics Top

jon
Some minor things in the paper edition that says “3 2020” on the title page verso, not mentioned in the book’s errata online: p. 186 But...
New
brianokken
Many tasks_proj/tests directories exist in chapters 2, 3, 5 that have tests that use the custom markers smoke and get, which are not decl...
New
raul
Hi Travis! Thank you for the cool book! :slight_smile: I made a list of issues and thought I could post them chapter by chapter. I’m rev...
New
leonW
I ran this command after installing the sample application: $ cards add do something --owner Brian And got a file not found error: Fil...
New
fynn
This is as much a suggestion as a question, as a note for others. Locally the SGP30 wasn’t available, so I ordered a SGP40. On page 53, ...
New
jskubick
I’m under the impression that when the reader gets to page 136 (“View Data with the Database Inspector”), the code SHOULD be able to buil...
New
adamwoolhether
I’m not quite sure what’s going on here, but I’m unable to have to containers successfully complete the Readiness/Liveness checks. I’m im...
New
akraut
The markup used to display the uploaded image results in a Phoenix.LiveView.HTMLTokenizer.ParseError error. lib/pento_web/live/product_l...
New
dachristenson
I just bought this book to learn about Android development, and I’m already running into a major issue in Ch. 1, p. 20: “Update activity...
New
dachristenson
@mfazio23 Android Studio will not accept anything I do when trying to use the Transformations class, as described on pp. 140-141. Googl...
New

Other popular topics Top

Exadra37
Please tell us what is your preferred monitor setup for programming(not gaming) and why you have chosen it. Does your monitor have eye p...
New
dasdom
No chair. I have a standing desk. This post was split into a dedicated thread from our thread about chairs :slight_smile:
New
PragmaticBookshelf
Tailwind CSS is an exciting new CSS framework that allows you to design your site by composing simple utility classes to create complex e...
New
PragmaticBookshelf
Build efficient applications that exploit the unique benefits of a pure functional language, learning from an engineer who uses Haskell t...
New
DevotionGeo
I have always used antique keyboards like Cherry MX 1800 or Cherry MX 8100 and almost always have modified the switches in some way, like...
New
New
AstonJ
If you’re getting errors like this: psql: error: connection to server on socket “/tmp/.s.PGSQL.5432” failed: No such file or directory ...
New
AnfaengerAlex
Hello, I’m a beginner in Android development and I’m facing an issue with my project setup. In my build.gradle.kts file, I have the foll...
New
PragmaticBookshelf
Explore the power of Ash Framework by modeling and building the domain for a real-world web application. Rebecca Le @sevenseacat and ...
New
Margaret
Ask Me Anything with Mark Volkmann @mvolkmann On February 24 and 25, we are giving you a chance to ask questions of PragProg author M...
New

Sub Categories: