asteroids/ship.cpp at master · carljohan/asteroids · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
#include "ship.h"
#include <cmath>
#include <cstdlib>

#define PI M_PI

using namespace std;

ship::ship(){

	// Position
	x = 200;
	y = 200;
	// Velocity
	vx = 0;
	vy = 0;
	// Rotation
	theta = -PI/2;
	omega = 0;
	// 'Strength' of ship thrust and rotation
	thrust = 0.5;
	alpha = 0.01;
	// Collision radius and draw size
	size = 30.0;
	// Limit speed and rotation
	vmax = 20;
	omax = 0.2;
	// Current powerup status
	power = 0;

}

// Get functions
double ship::getx(){

	return x;

}

double ship::gety(){

	return y;

}

double ship::gettheta(){

	return theta;

}

double ship::getNoseX(){

	return x+size*cos(theta);

}

double ship::getNoseY(){

	return y+size*sin(theta);

}

double ship::getvx(){

	return vx;

}

double ship::getvy(){

	return vy;

}

double ship::getsize(){

	return size;

}

int ship::getpower(){

	return power;

}

// Set functions
void ship::setx( double nx ){

	x = nx;

}

void ship::sety( double ny ){

	y = ny;

}

void ship::setpower( int npower ){

	power = npower;

}

// Accelerates forward when 'up' or 'w' pressed
void ship::accelerate_linear( int thr ){

	if( thr ){
		if( sqrt(vx*vx+vy*vy) < vmax ){
			vx += thrust*cos(theta);
			vy += thrust*sin(theta);
		}else{
			vx = vx*0.95;
			vy = vy*0.95;
		}
	}

}

// Angular acceleration for <-/-> or a/d
void ship::accelerate_angular( double d ){

	if( abs(omega) < omax ){
		omega += d*alpha;
	}else{
		omega = omega*0.95;
	}

}

// Automatically update position after time elapsed
void ship::move(){

	x += vx;
	y += vy;
	theta += omega;

}

// Teleport to a random screen location when 'down' or 's' pressed
void ship::teleport( int width, int height ){

	x = rand()%(width-100)+50;
	y = rand()%(height-100)+50;

}

// Draw to screen
void ship::draw( SDL_Surface* screen, Uint32 color ){

	double ax, ay, bx, by, cx, cy, dx, dy;

	ax = x+size*cos(theta);
	ay = y+size*sin(theta);

	bx = x+size*cos(theta+13*PI/16);
	by = y+size*sin(theta+13*PI/16);

	cx = x+(size-size/3)*cos(theta+PI);
	cy = y+(size-size/3)*sin(theta+PI);

	dx = x+size*cos(theta+19*PI/16);
	dy = y+size*sin(theta+19*PI/16);

	Draw_Line(screen, ax,ay, bx,by, color);
	Draw_Line(screen, bx,by, cx,cy, color);
	Draw_Line(screen, cx,cy, dx,dy, color);
	Draw_Line(screen, dx,dy, ax,ay, color);

}

void ship::check_borders(int width, int height){
	if (x <= size){
		x = width-size-1;
	}else if (x >= width-size){
		x = 1+size;
	}
	if (y <= size){
		y = height-size-1;
	}else if (y >= height-size){
		y = 1+size;
	}
}