Richard Ellingworth / Mbed 2 deprecated RobotRic

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?

UserRevisionLine numberNew 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 }