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Dependencies:   mbed

Ball/Ball.cpp@15:40cf30a7a71b, 2019-05-09 (annotated)

Committer:
kocemax
Date:
Thu May 09 12:19:28 2019 +0000
Revision:
15:40cf30a7a71b
Parent:
13:3585d2ea4ff4 
Final Commit. Kostadin Chakarov, SID: 201 171 978. I have read the University Regulations on Plagiarism and state that the work covered by this declaration is my own

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kocemax 2:006a2ddfabb6 1 #include "Ball.h"
kocemax 8:9b77eea95088 2 #include "Paddle.h"
kocemax 8:9b77eea95088 3 #include <math.h>
kocemax 2:006a2ddfabb6 4
kocemax 2:006a2ddfabb6 5 Ball::Ball()
kocemax 2:006a2ddfabb6 6 {
kocemax 12:b3ec47d606a5 7 reset(); // initial parameters of ball
kocemax 2:006a2ddfabb6 8 }
kocemax 2:006a2ddfabb6 9
kocemax 2:006a2ddfabb6 10 Ball::~Ball()
kocemax 2:006a2ddfabb6 11 {
kocemax 2:006a2ddfabb6 12 }
kocemax 2:006a2ddfabb6 13
kocemax 7:cd3cafda3dd4 14 void Ball::move()
kocemax 7:cd3cafda3dd4 15 {
kocemax 6:39bda45efeed 16 GameObject::move();
kocemax 10:da5743dfb137 17
kocemax 12:b3ec47d606a5 18 // Right edge
kocemax 7:cd3cafda3dd4 19 if (pos.x > WIDTH-1) {
kocemax 8:9b77eea95088 20 velocity.x = -velocity.x;
kocemax 8:9b77eea95088 21 pos.x = WIDTH-1;
kocemax 10:da5743dfb137 22 }
kocemax 12:b3ec47d606a5 23 // Left edge
kocemax 10:da5743dfb137 24 else if(pos.x < 1) {
kocemax 8:9b77eea95088 25 velocity.x = -velocity.x;
kocemax 8:9b77eea95088 26 pos.x = 1;
kocemax 2:006a2ddfabb6 27 }
kocemax 12:b3ec47d606a5 28 // Top edge
kocemax 7:cd3cafda3dd4 29 if (pos.y < 1) {
kocemax 8:9b77eea95088 30 velocity.y = -velocity.y;
kocemax 8:9b77eea95088 31 pos.y = 1;
kocemax 10:da5743dfb137 32 }
kocemax 12:b3ec47d606a5 33 // Bottom edge
kocemax 10:da5743dfb137 34 else if (pos.y > HEIGHT-1) {
kocemax 8:9b77eea95088 35 velocity.y = -velocity.y;
kocemax 8:9b77eea95088 36 pos.y = HEIGHT-1;
kocemax 2:006a2ddfabb6 37 }
kocemax 3:fe856d0890ee 38 }
kocemax 3:fe856d0890ee 39
kocemax 8:9b77eea95088 40
kocemax 8:9b77eea95088 41 #define PI 3.14159265
kocemax 8:9b77eea95088 42 float Deg2Rad = PI / 180;
kocemax 8:9b77eea95088 43 float Rad2Deg = 180 / PI;
kocemax 8:9b77eea95088 44
kocemax 12:b3ec47d606a5 45 // NOTE: This is how our coordinate system is setup.
kocemax 12:b3ec47d606a5 46 // angles go clock-wise, right is zero, up is -pi/2, down is pi/2
kocemax 12:b3ec47d606a5 47 // printf("angle of down: %.02f\n", atan2(1.f, 0));
kocemax 12:b3ec47d606a5 48 // printf("angle of right: %.02f\n", atan2(0.f, 1));
kocemax 12:b3ec47d606a5 49 // printf("angle of up: %.02f\n", atan2(-1.f, 0));
kocemax 8:9b77eea95088 50
kocemax 13:3585d2ea4ff4 51 // Standard rotation of a vector by given degrees
kocemax 13:3585d2ea4ff4 52 // Example of this function to play around with: https://repl.it/repls/HopefulTrimWordprocessing
kocemax 8:9b77eea95088 53 void Rotate(Vector2D& v, float degrees)
kocemax 8:9b77eea95088 54 {
kocemax 12:b3ec47d606a5 55 float s = (float)sin(degrees * Deg2Rad); // stores sin value betweem -1 and 1
kocemax 12:b3ec47d606a5 56 float c = (float)cos(degrees * Deg2Rad); // stores cos value betweem -1 and 1
kocemax 8:9b77eea95088 57
kocemax 12:b3ec47d606a5 58 float tx = v.x; // 2D Vector (tx, ty) for the velocity
kocemax 8:9b77eea95088 59 float ty = v.y;
kocemax 8:9b77eea95088 60
kocemax 12:b3ec47d606a5 61 // Rotation: Multiply vector by rotation matrix
kocemax 8:9b77eea95088 62 v.x = (c * tx) - (s * ty);
kocemax 8:9b77eea95088 63 v.y = (s * tx) + (c * ty);
kocemax 8:9b77eea95088 64 }
kocemax 8:9b77eea95088 65
kocemax 8:9b77eea95088 66 /** Sets upper and lower boundary for angle
kocemax 8:9b77eea95088 67 * @return clamped angle between sane boundaries
kocemax 8:9b77eea95088 68 */
kocemax 8:9b77eea95088 69 float clamp(float x, float minn, float maxx)
kocemax 3:fe856d0890ee 70 {
kocemax 8:9b77eea95088 71 return min(max(x, minn), maxx);
kocemax 8:9b77eea95088 72 }
kocemax 8:9b77eea95088 73
kocemax 8:9b77eea95088 74
kocemax 8:9b77eea95088 75 void Ball::hitPad(Paddle &paddle)
kocemax 8:9b77eea95088 76 {
kocemax 8:9b77eea95088 77 const Vector2D& posPad = paddle.getPos();
kocemax 9:f720f5d87420 78 if (pos.y >= posPad.y - 1 && (pos.x >= posPad.x && pos.x <= posPad.x + paddle.getW())) {
kocemax 12:b3ec47d606a5 79 // We hit the pad
kocemax 8:9b77eea95088 80
kocemax 12:b3ec47d606a5 81 // First: rotate about paddle's surface normal (flip upward)
kocemax 8:9b77eea95088 82 velocity.y = -velocity.y;
kocemax 8:9b77eea95088 83
kocemax 12:b3ec47d606a5 84 // Change angle based on distance to center
kocemax 12:b3ec47d606a5 85 float distanceSensitivity = 120; // Add at most this many degrees
kocemax 12:b3ec47d606a5 86 float maxDx = paddle.getW()/2; // Maximum distance from centre
kocemax 12:b3ec47d606a5 87 float cx = posPad.x + paddle.getW()/2.0f; // Maximum distance from current paddle centre
kocemax 12:b3ec47d606a5 88 float dx = pos.x - cx; // Positive dx means right of center, 0 means at center
kocemax 8:9b77eea95088 89
kocemax 12:b3ec47d606a5 90 float dangle = dx/maxDx * distanceSensitivity; // Delta angle, meaning change in angle
kocemax 12:b3ec47d606a5 91 float currentAngle = atan2(velocity.y, velocity.x)*Rad2Deg; // Angle of our original outgoing velocity vector
kocemax 12:b3ec47d606a5 92 float newAngle = currentAngle + dangle; // The current angle + the change in the angle
kocemax 8:9b77eea95088 93
kocemax 8:9b77eea95088 94 //printf("angle: %.02f %.02f, %.02f\n", dx, currentAngle, newAngle);
kocemax 8:9b77eea95088 95
kocemax 8:9b77eea95088 96
kocemax 12:b3ec47d606a5 97 // Always clamp angle in sane boundaries
kocemax 12:b3ec47d606a5 98 newAngle = clamp(newAngle, -160, -20); // Clamp to the range of an upward facing cone (NOTE: -90 degrees is up)
kocemax 8:9b77eea95088 99
kocemax 12:b3ec47d606a5 100 // Rotate the outgoing vector by the clamped dangle
kocemax 8:9b77eea95088 101 dangle = newAngle - currentAngle;
kocemax 8:9b77eea95088 102 Rotate(velocity, dangle);
kocemax 8:9b77eea95088 103
kocemax 2:006a2ddfabb6 104 }
kocemax 2:006a2ddfabb6 105
kocemax 6:39bda45efeed 106 }
kocemax 6:39bda45efeed 107
kocemax 6:39bda45efeed 108 int Ball::randomize()
kocemax 4:0e01cbb95434 109 {
kocemax 12:b3ec47d606a5 110 AnalogIn noisy(PTB0); // Disconnected pin so will have random noise
kocemax 12:b3ec47d606a5 111 srand(1000000*noisy.read()); // Read the random noise and seed
kocemax 12:b3ec47d606a5 112 int direction = rand() % 2; // Randomise initial direction
kocemax 12:b3ec47d606a5 113 int movement; // Int to store the x-direction
kocemax 7:cd3cafda3dd4 114 if (direction == 0) {
kocemax 6:39bda45efeed 115 movement = -1;
kocemax 7:cd3cafda3dd4 116 } else if (direction == 1) {
kocemax 6:39bda45efeed 117 movement = 1;
kocemax 6:39bda45efeed 118 }
kocemax 7:cd3cafda3dd4 119 return movement;
kocemax 6:39bda45efeed 120 }
kocemax 6:39bda45efeed 121
kocemax 7:cd3cafda3dd4 122 void Ball::reset()
kocemax 6:39bda45efeed 123 {
kocemax 12:b3ec47d606a5 124 pos.x = WIDTH/2; // initial position of ball on x-axis
kocemax 12:b3ec47d606a5 125 pos.y = HEIGHT - GAP - 2; // initial position of ball on y-axis
kocemax 12:b3ec47d606a5 126 velocity.x = randomize(); // initial x-velocity of ball
kocemax 12:b3ec47d606a5 127 velocity.y = -1; // initial y-velocity of ball
kocemax 12:b3ec47d606a5 128 w = 1; // width of the ball
kocemax 12:b3ec47d606a5 129 h = 1; // height of the ball
kocemax 2:006a2ddfabb6 130 }