Version of Robotron arcade game using LPC1768, a Gameduino shield, a serial EEPROM (for high scores), two microswitch joysticks and two buttons plus a box to put it in. 20 levels of mayhem.
Dependencies: 25LCxxx_SPI CommonTypes Gameduino mbed
BulletVelocityCalculator.cpp@18:70190f956a24, 2013-06-17 (annotated)
- Committer:
- RichardE
- Date:
- Mon Jun 17 15:10:43 2013 +0000
- Revision:
- 18:70190f956a24
- Parent:
- 7:e72691603fd3
Improved response to button 1 when entering high scores (HighScoreEntry.cpp).
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
RichardE | 7:e72691603fd3 | 1 | /* |
RichardE | 7:e72691603fd3 | 2 | * SOURCE FILE : BulletVelocityCalculator.cpp |
RichardE | 7:e72691603fd3 | 3 | * |
RichardE | 7:e72691603fd3 | 4 | * Definition of class BulletVelocityCalculator. |
RichardE | 7:e72691603fd3 | 5 | * |
RichardE | 7:e72691603fd3 | 6 | */ |
RichardE | 7:e72691603fd3 | 7 | |
RichardE | 7:e72691603fd3 | 8 | #include <stdlib.h> // for abs |
RichardE | 7:e72691603fd3 | 9 | #include "BulletVelocityCalculator.h" |
RichardE | 7:e72691603fd3 | 10 | |
RichardE | 7:e72691603fd3 | 11 | // A few constants. |
RichardE | 7:e72691603fd3 | 12 | #define COS11_25 0.980785 |
RichardE | 7:e72691603fd3 | 13 | #define SIN11_25 0.195090 |
RichardE | 7:e72691603fd3 | 14 | #define COS33_75 0.831470 |
RichardE | 7:e72691603fd3 | 15 | #define SIN33_75 0.555570 |
RichardE | 7:e72691603fd3 | 16 | #define COS56_25 0.555570 |
RichardE | 7:e72691603fd3 | 17 | #define SIN56_25 0.831470 |
RichardE | 7:e72691603fd3 | 18 | #define COS78_75 0.195090 |
RichardE | 7:e72691603fd3 | 19 | #define SIN78_75 0.980785 |
RichardE | 7:e72691603fd3 | 20 | |
RichardE | 7:e72691603fd3 | 21 | /*******************************/ |
RichardE | 7:e72691603fd3 | 22 | /* CALCULATE BULLET VELOCITIES */ |
RichardE | 7:e72691603fd3 | 23 | /*******************************/ |
RichardE | 7:e72691603fd3 | 24 | // Pass distances to target in dx and dy. |
RichardE | 7:e72691603fd3 | 25 | // Pass velocity at which bullet moves in v. |
RichardE | 7:e72691603fd3 | 26 | // Horizontal and vertical velocities returned in variables pointed to by hv and vv. |
RichardE | 7:e72691603fd3 | 27 | void BulletVelocityCalculator::CalculateVelocities( Int16 dx, Int16 dy, Int16 v, Int16 *hv, Int16 *vv ) { |
RichardE | 7:e72691603fd3 | 28 | Int16 ax = abs( dx ); |
RichardE | 7:e72691603fd3 | 29 | Int16 ay = abs( dy ); |
RichardE | 7:e72691603fd3 | 30 | if( ax < 8 ) { |
RichardE | 7:e72691603fd3 | 31 | *hv = 0; |
RichardE | 7:e72691603fd3 | 32 | *vv = v; |
RichardE | 7:e72691603fd3 | 33 | } |
RichardE | 7:e72691603fd3 | 34 | else if( ay < 8 ) { |
RichardE | 7:e72691603fd3 | 35 | *hv = v; |
RichardE | 7:e72691603fd3 | 36 | *vv = 0; |
RichardE | 7:e72691603fd3 | 37 | } |
RichardE | 7:e72691603fd3 | 38 | else { |
RichardE | 7:e72691603fd3 | 39 | float ratio = (float)ay / (float)ax; |
RichardE | 7:e72691603fd3 | 40 | if( ratio < 0.5f ) { |
RichardE | 7:e72691603fd3 | 41 | *hv = v * COS11_25; |
RichardE | 7:e72691603fd3 | 42 | *vv = v * SIN11_25; |
RichardE | 7:e72691603fd3 | 43 | } |
RichardE | 7:e72691603fd3 | 44 | else if( ratio < 1.0f ) { |
RichardE | 7:e72691603fd3 | 45 | *hv = v * COS33_75; |
RichardE | 7:e72691603fd3 | 46 | *vv = v * SIN33_75; |
RichardE | 7:e72691603fd3 | 47 | } |
RichardE | 7:e72691603fd3 | 48 | else if( ratio < 2.0f ) { |
RichardE | 7:e72691603fd3 | 49 | *hv = v * COS56_25; |
RichardE | 7:e72691603fd3 | 50 | *vv = v * SIN56_25; |
RichardE | 7:e72691603fd3 | 51 | } |
RichardE | 7:e72691603fd3 | 52 | else { |
RichardE | 7:e72691603fd3 | 53 | *hv = v * COS78_75; |
RichardE | 7:e72691603fd3 | 54 | *vv = v * SIN78_75; |
RichardE | 7:e72691603fd3 | 55 | } |
RichardE | 7:e72691603fd3 | 56 | } |
RichardE | 7:e72691603fd3 | 57 | if( dx < 0 ) { |
RichardE | 7:e72691603fd3 | 58 | *hv = -(*hv); |
RichardE | 7:e72691603fd3 | 59 | } |
RichardE | 7:e72691603fd3 | 60 | if( dy < 0 ) { |
RichardE | 7:e72691603fd3 | 61 | *vv = -(*vv); |
RichardE | 7:e72691603fd3 | 62 | } |
RichardE | 7:e72691603fd3 | 63 | } |