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Working with Objects Using Classes
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The BasicObject Class
Here's the code to define the class and also has comments for each of the functions included with it. You can define it anywhere in your code, but I recommend adding a C++ header file called "classes.h" to your project and putting it in there.
Move on to the next section to see how we would make a subclass of this class.
/**********************************************************
BasicObject Class:
This class contains the basic stuff for an object:
position, size, velocity, and boundary coordinates.
SetTimeInt(float t) - sets the time interval to update
the object according to how much time has passed since
the last update.
UpdateSides() - updates the side coordinate values,
used for collision detection.
UpdateAcc() - updates the velocity based on the
acceleration values
UpdatePos() - updates the new position based on
velocity and the amount of time passed.
SetPos(float nx, float ny, float nz) - sets new
position.
SetVel(float nvx, float nvy, float nvz) - sets new
velocity
SetAcc(float nax, float nay, float naz) - sets new
acceleration
SetSize(float nw, float nl, float nh) - sets new size and
updates the new side coordinates
**********************************************************/
class BasicObject {
public:
float x, y, z; // position variables
float vx, vy, vz; // velocity variables
float ax, ay, az; // acceleration variables
float l, w, h; // size variables
// side boundary coordinate variables
float left, rght, frnt, back, top, btm;
float time;
void SetTimeInt(float t) {
time = t;
}
void UpdatePos() {
x += vx * time;
y += vy * time;
z += vz * time;
}
void UpdateAcc() {
vx += ax;
vy += ay;
vz += az;
}
void UpdateSides() {
left = x - w;
rght = x + w;
frnt = z + l;
back = z - l;
top = y + h;
btm = y - h;
}
void SetPos(float nx, float ny, float nz) {
x = nx;
y = ny;
z = nz;
UpdateSides();
}
void SetVel(float nvx, float nvy, float nvz) {
vx = nvx;
vy = nvy;
vz = nvz;
}
void SetAcc(float nax, float nay, float naz) {
ax = nax;
ay = nay;
az = naz;
}
void SetSize(float nw, float nl, float nh) {
w = nw;
l = nl;
h = nh;
UpdateSides();
}
};
That's it. Move on to the next section to see how we would make a subclass of this class.
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Working with Objects Using Classes
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Page 3 of 4 |
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