Diff: main.cpp

Revision:

2:552e6feb8709

Parent:

1:6b99ffa62cc8

Child:

3:a7f02754bc99

--- a/main.cpp	Tue Oct 24 12:34:19 2017 +0000
+++ b/main.cpp	Tue Nov 07 12:07:36 2017 +0000
@@ -1,25 +1,36 @@
-// Demo for the uLCD-144-G2 and MMA8452Q 3-axis accelerometer
+// A solution to OCE360 Homework #4.
+// Objective: Use object oriented programming to create a system that displays
+// multiple balls bouncing around the LCD screen.
 
 #include "mbed.h"
-#include "MMA8452Q.h"
-#include "uLCD_4DGL.h"
-#include "bouncing_ball.h"
+#include "MMA8452Q.h"           //acceleromater library
+#include "uLCD_4DGL.h"          //LCD library
+#include "bouncing_ball.h"      //new ball phyics library
 
-#define INIT_RADIUS 10
-#define INIT_COLOR 1
+#define UPDATE_TIME_S 0.02
+#define START_X_1 10
+#define START_Y_1 10
+#define START_X_2 20
+#define START_Y_2 20
+#define RADIUS_1 6
+#define RADIUS_2 3
 
-//#include "bouncing_ball.h"
+#define DEBUG_MODE 0
+
+//Function prototype for color selection function:
+int get_LCD_color(int color_integer);
 
 // Graphic LCD - TX, RX, and RES pins
-uLCD_4DGL uLCD(p9,p10,p11);
+uLCD_4DGL uLCD(p9,p10,p11);     //initialize a driver object for an LCD connected on pins 9-11
 
 // Accelerometer - SDA, SCL, and I2C address
-MMA8452Q accel(p28, p27, 0x1D);
+MMA8452Q accel(p28, p27, 0x1D);  //initialize a driver object for an accelerometer connected on pins 27-28.
 
-physics_ball ball1(INIT_COLOR,INIT_RADIUS);
+physics_ball ball1;  //initialize two balls for bouncing
+physics_ball ball2;  //the default states from the library will be used initially
 
-int main() {
-
+int main()
+{
     // Initialize uLCD
     uLCD.baudrate(115200);
     uLCD.background_color(BLACK);
@@ -28,18 +39,58 @@
     // Initialize accelerometer
     accel.init();
 
-    //Initiailize ball
-    
-    // Make a ball "fall" in direction of accelerometer
-    while (1) {
+    //Initialize balls:
+    ball1.set_state(START_X_1,START_Y_1,0,0); //speeds are set to zero
+    ball1.set_state(START_X_2,START_Y_2,0,0);
+
+    //Set ball radius and color:
+    ball1.set_param(RADIUS_1,0); //color is unimportant
+    ball2.set_param(RADIUS_2,1); //just making sure the colors are different
+
+    /* Make the balls "fall" in direction of accelerometer by forcing the ball objects
+     to update themselves at regular intervals, and te drawing the locations reported
+     by the ball objects on the LCD screen: */
+    while (1) {  //execute 'forever'
+        // Draw a red circle using the x and y positions stored by the object 'ball1':
+        uLCD.filled_circle(ball1.posx, ball1.posy, ball1.radius, get_LCD_color(ball1.color));
+        // Draw a blue circle using the x and y positions stored by the object 'ball2':
+        uLCD.filled_circle(ball2.posx, ball2.posy, ball2.radius, get_LCD_color(ball2.color));
+
+        // Wait before erasing old circles:
+        wait(UPDATE_TIME_S);         // In seconds
+
+        // Erase old circles by writing over there locations using the screen color:
+        uLCD.filled_circle(ball1.posx, ball1.posy, ball1.radius, BLACK);
+        uLCD.filled_circle(ball2.posx, ball2.posy, ball2.radius, BLACK);
 
-        // Draw a red circle
-        uLCD.filled_circle((int)ball1.posx, (int)ball1.posy, ball1.radius, RED);
+        // Force the objects 'ball1' and 'ball2' to update their stored positions
+        // and velocities:
+        ball1.update(UPDATE_TIME_S,accel);
+        ball2.update(UPDATE_TIME_S,accel);
+
+        if (DEBUG_MODE) {
+            uLCD.locate(0,4);
+            uLCD.printf("X: %d.1\nY: %.1d",ball1.posx,ball1.posy);
+
+            uLCD.locate(0,6);
+            uLCD.printf("VX: %f.1\nVY: %.1f",ball1.speedx,ball1.speedy);
 
-        // Wait before erasing old circle
-        wait(0.02);         // In seconds
+            uLCD.locate(0,10);
+            uLCD.printf("AX: %f.1\nAY: %.1f\nAZ: %0.1f",accel.readX(),accel.readY(),accel.readZ());
+        }
+    }
+}
 
-        // Erase old circle
-        uLCD.filled_circle((int)ball1.posx, (int)ball1.posy, ball1.radius, BLACK);
+int get_LCD_color(int color_integer)
+{
+    switch (color_integer) {
+        case 0:
+            return(RED);
+        case 1:
+            return(BLUE);
+        case 2:
+            return(GREEN);
+        default:
+            return(WHITE);
     }
 }
\ No newline at end of file