Diff: GameEngine/engine.cpp

Revision:

11:0e6a221ad8a9

Parent:

10:b939edd9b87c

Child:

12:bc9a43f56261

--- a/GameEngine/engine.cpp	Fri May 10 12:00:30 2019 +0000
+++ b/GameEngine/engine.cpp	Fri May 10 13:58:51 2019 +0000
@@ -1,8 +1,7 @@
 
 #include "engine.h"
 
-Engine::Engine(){
-    
+Engine::Engine(){    
     
 }
 
@@ -15,19 +14,25 @@
     _screen_height = screenHeight;
     _screen_width = screenWidth;
     
+    // set the car parameters to 0.0f
     car.set_speed(0.0f);
     car.set_car_position(0.0f);
     car.set_car_distance(0.0f);
-    car.set_gear();
+    car.set_gear(); // this one starts from 1
     
+    // road curvature is 0.0 i.e it is in the middle (straight line)
     _curvature = 0.0f;
     
+    // set map fields to 0.0 as well
     map.set_player_curvature(0.0f);
     map.set_timed_curvature(0.0f); 
     
+    // some variables to keep details of the current map and time 
     _track_distance = 0.0f;
     _lap_time = 0.0f;
     
+    
+    // design a map
     addSegment(0.0f, 500.0f);
     addSegment(-1.0f, 600.0f);
     addSegment(1.0f, 600.0f);
@@ -39,6 +44,7 @@
     addSegment(-1.0f, 600.0f);
     addSegment(0.0f, 700.0f);
     
+    // find how long is the track 
     calc_track_distance();
      
 }
@@ -46,12 +52,7 @@
 
 void Engine::update(Gamepad &pad, N5110 &lcd, float elapsedTime) {
     
-    clearScreen(lcd);
-    
-    drawFrame(lcd); // draw the frame around the picture
-    
-
-    
+    // split the curvature do it appears slowly
     if(fabs(map.get_player_curvature() - map.get_timed_curvature()) >= 0.5f) {
             
             car.set_speed(car.get_speed() - 5.0f * elapsedTime);  
@@ -66,6 +67,7 @@
     float foffset = 0;
     int ntrackSection = 0;
     
+    // add the time to the overall time
     _lap_time += elapsedTime;
     
     // restart the car distance 
@@ -84,21 +86,19 @@
     // the curvature of the segment we are in
     float targetCurvature = track[ntrackSection -1].curvature;
     
-    // small curvature to be displayed
+    // small curvature to be displayed but this time based on speed as well
     float curvDiff = (targetCurvature - _curvature) * elapsedTime * car.get_speed();
-    
-    // slowly changing curvature
+     // slowly changing curvature
     _curvature += curvDiff;
 
     // the best curvature we should aim for
+    // other wise the car gets slowed down
     map.set_timed_curvature( (_curvature) * elapsedTime * car.get_speed() );
     
-    draw(lcd); // change the pixels of the buffer;
 
     // draw car 
     car.set_car_position(map.get_player_curvature() - map.get_timed_curvature());  
-    car.draw(lcd, _screen_width); 
-    lcd.refresh();  
+     
 }
 
 void Engine::read_input(Gamepad &pad, float elapsedTime) {
@@ -106,6 +106,7 @@
     float _mag;
     _mag = pad.get_mag();
     
+    // car moving to the front 
     if(pad.get_direction() == N) {
             car.set_speed(car.get_speed() + 0.5f * elapsedTime * _mag);
             car.set_direction(0); // 
@@ -114,11 +115,13 @@
             car.set_speed(car.get_speed() - 1.8f * elapsedTime); 
     }
     
+    // car brake
     if(pad.get_direction() == S) {
             car.set_speed(car.get_speed() - 5.0f * elapsedTime * _mag);
             car.set_direction(0); // 
     }
-        
+    
+    // car moving to the diagonally    
     if(pad.get_direction() == W || pad.get_direction() == NW) {
             if(pad.get_direction() == NW) {
                 map.set_player_curvature(map.get_player_curvature() - 0.7f * elapsedTime);
@@ -129,6 +132,7 @@
             car.set_direction(1);
             
     }
+    // car moving to the diagonally  
     if(pad.get_direction() == E || pad.get_direction() == NE) {
             if(pad.get_direction() == NE) {
                 map.set_player_curvature(map.get_player_curvature() + 0.7f * elapsedTime);
@@ -138,6 +142,8 @@
                 map.set_player_curvature(map.get_player_curvature() + 1.4f * elapsedTime);
             car.set_direction(2);
     }
+    
+    // change gears
     if(pad.check_event(Gamepad::Y_PRESSED)) {
         car.upShift();   
     }
@@ -146,7 +152,7 @@
     }
 }
  
-
+// draw the road and the sides we only need half the screen 
 void Engine::draw(N5110 &lcd) {
 
     for (int y = 0; y < _screen_height / 2; y++) {
@@ -176,9 +182,12 @@
                                                                 leftSide,
                                                                 rightSide);       
         }
+        car.draw(lcd, 84);
+        drawFrame(lcd); // draw the frame around the picture
+        
     }
 }
-
+// colour the pixel accoring to the give boundaries
 void Engine::assignPixel(N5110 &lcd,int x, int y, int row, float SideColour, float GrassColour,
                                                                 int leftGrass,
                                                                 int rightGrass,
@@ -204,6 +213,7 @@
             }
 } 
 
+// use sin function to 'paint' the grass
 float Engine::defineStripes(N5110 &lcd, Car &car, float frequency, float perspective) {
     
     float colour = sinf(frequency * powf(1.0f - perspective, 3) + car.get_car_distance() * 0.1f);
@@ -213,18 +223,20 @@
     
     return colour;
 }
-
+// add segment to the map
 void Engine::addSegment(float curvature, float meters) {
     
     // clap the curvature variable
     if(curvature < -1.0f) curvature = -1.0f;
     if(curvature > 1.0f) curvature = 1.0f;
+    // place a segment on the map
     MapSegment segment;
     segment.curvature = curvature;
     segment.meters = meters;
     track.push_back(segment);   
 }
 
+// go throught the map and add distance
 void Engine::calc_track_distance() {
     
     for (vector<MapSegment>::iterator it = track.begin(); it != track.end(); ++it) {