Using vec2ΒΆ
A vec2 is a simple struct containing nothing but an X and Y float. It is similar to a Pointf in that regard, but is packed with mathematical features and shortcuts.
You can create a vec2 with its standard constructor:
//creates a vec2 with an X value of 100.0, and a Y value of 200.0
vec2 location = new vec2(100f, 200f);
Giving a vec2 one parameter will assign the value to both X and Y.
//creates a vec2 with an X and Y value of 100.0
vec2 location = new vec2(100f);
You can add, subtract, multiply, and divide vec2s together. The following two code blocks perform the same operations.
vec2 A = new vec2(10f, 20f);
vec2 B = new vec2(5f, 2f);
//creates a vec2 with an X value of 15.0, and a Y of 22.0
vec2 C = new vec2(A.x + B.x, A.y + B.y);
Is the same as..
vec2 A = new vec2(10f, 20f);
vec2 B = new vec2(5f, 2f);
vec2 C = A + B
vec2 math operators can also be performed with floats to affect both X and Y
vec2 A = new vec2(5f, 10f);
//A now has an X value of 30.0, and a Y of 60.0
vec2 A *= 6f;
Calling vec2.Length will return the distance between vec2s in pixels
vec2 A = new vec2(); //same as vec2.Zero
vec2 B = new vec2(5f, 10f);
//equivalent to 11.18 or Math.sqrt((A.x-B.x)*(A.x-B.x)+(A.y-B.y)*(A.y-B.y))
float distance = A.Length(B);
Calling vec2.Normalize will return a direction vector from (0,0) with a radius of 1.0
vec2 position = new vec2(100f, 150f);
vec2 destination = new vec2(50f, 30f);
float moveDistance = 3f;
vec2 moveDirection = (position - destination).Normalize();
//position will be exactly 3 pixels closer to destination
position += moveDirection * moveDistance;
vec2 can be implicitly converted between Pointf as well as rounded down to a standard Point.
Pointf A = new Pointf(100f, 200f);
vec2 B = A; //X and Y from A get assigned to B
//If you need to use Pointf and are feeling lazy, casting as a vec2 allows use of all math operators
Pointf C = (vec2)A + B;