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honoring_the_code/001 - Space Maze/README.md
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@ -50,3 +50,27 @@ The main problem is that the code goes through ALL of the coordinates testing fo
```
It should be noted that although Z holds the zone number where the spaceship is, this variable is not used for anything else but testing if it's non-zero (in which case the spaceship is in none of the zones, thus out of the maze) and also that Z is not even properly set as lines 135 to 142 all set Z to 6 as if it was the same zone. Also, the comments indicate that there are 11 zones when in fact there are 16. It looks like during the development the maze was modified from 11 to 16 zones. And one last thing, some zones limits overlap but that's ok.
## Fixing the game
So the first thing that comes to mind is that once you know in which zone the spaceship is, you need to skip all the other tests. Simply putting a "GOTO 175" at the end of each test line is enough. Running the program with the sound on for the spaceship will prove you that this was really the main bottleneck ! You can already notice how the spaceship is now much more responsive.
```basic
100 IF (X > = 10 AND X < = 80) AND (Y > = 80 AND Y < = 100) THEN Z = 1: GOTO 175
110 IF (X > = 60 AND X < = 100) AND (Y > = 100 AND Y < = 120) THEN Z = 2: GOTO 175
120 IF (X > = 80 AND X < = 100) AND (Y > = 120 AND Y < = 158) THEN Z = 3: GOTO 175
125 IF (X > = 100 AND X < = 140) AND (Y > = 140 AND Y < = 158) THEN Z = 4: GOTO 175
130 IF (X > = 120 AND X < = 180) AND (Y > = 120 AND Y < = 140) THEN Z = 5: GOTO 175
135 IF (X > = 160 AND X < = 220) AND (Y > = 140 AND Y < = 158) THEN Z = 6: GOTO 175
137 IF (X > = 200 AND X < = 220) AND (Y > = 110 AND Y < = 140) THEN Z = 6: GOTO 175
138 IF (X > = 220 AND X < = 265) AND (Y > = 110 AND Y < = 130) THEN Z = 6: GOTO 175
139 IF (X > = 245 AND X < = 265) AND (Y > = 40 AND Y < = 110) THEN Z = 6: GOTO 175
140 IF (X > = 215 AND X < = 245) AND (Y > = 40 AND Y < = 60) THEN Z = 6: GOTO 175
141 IF (X > = 215 AND X < = 235) AND (Y > = 60 AND Y < = 100) THEN Z = 6: GOTO 175
142 IF (X > = 180 AND X < = 235) AND (Y > = 80 AND Y < = 100) THEN Z = 6: GOTO 175
145 IF (X > = 180 AND X < = 200) AND (Y > = 60 AND Y < = 100) THEN Z = 8: GOTO 175
150 IF (X > = 140 AND X < = 180) AND (Y > = 60 AND Y < = 80) THEN Z = 9: GOTO 175
160 IF (X > = 100 AND X < = 160) AND (Y > = 40 AND Y < = 60) THEN Z = 10: GOTO 175
162 IF (X > = 100 AND X < = 120) AND (Y > = 60 AND Y < = 80) THEN Z = 11: GOTO 175
```
Test for yourself, here's the code: [spacemaze_quickfix.bas](./spacemaze_quickfix.bas)