Orx Learning - en:examples:maths
https://orx-project.org/wiki/
2026-04-04T15:22:17+00:00Orx Learning
https://orx-project.org/wiki/
https://orx-project.org/wiki/_media/favicon.icotext/html2025-09-30T17:26:19+00:00Anonymous (anonymous@undisclosed.example.com)Convert an angle in degrees to a directional vector
https://orx-project.org/wiki/en/examples/maths/angle_degrees_to_vector?rev=1759253179&do=diff
Convert an angle in degrees to a directional vector
orxFLOAT degRotation = 45;
orxFLOAT radRotation = degRotation * orxMATH_KF_DEG_TO_RAD;
orxFLOAT x = orxMath_Cos(radRotation);
orxFLOAT y = orxMath_Sin(radRotation);
orxVECTOR directionVector = {x, y, 0};text/html2025-09-30T17:26:19+00:00Anonymous (anonymous@undisclosed.example.com)Convert a Vector to an Angle (radians)
https://orx-project.org/wiki/en/examples/maths/convert_vector_to_radian_angle?rev=1759253179&do=diff
Convert a Vector to an Angle (radians)
orxVECTOR myVector = { 100, 100, 0 };
orxFLOAT angle2 = orxMath_ATan(myVector.fY, myVector.fX);
Result
0.785398185 (45 degrees)text/html2025-09-30T17:26:19+00:00Anonymous (anonymous@undisclosed.example.com)Generating random numbers
https://orx-project.org/wiki/en/examples/maths/generating_random_numbers?rev=1759253179&do=diff
Generating random numbers
Code
//somewhere in the init
orxMath_InitRandom((orxS32)orxSystem_GetRealTime()); //a good seeding value
This also will ensure your random values from your Data Config are also properly randomised. See also Spawning Random Objects as a practical example of using random values.text/html2025-09-30T17:26:19+00:00Anonymous (anonymous@undisclosed.example.com)Initialising an empty orxVECTOR
https://orx-project.org/wiki/en/examples/maths/initialising_an_orxvector?rev=1759253179&do=diff
Initialising an empty orxVECTOR
Some ways to initialise an empty orxVECTOR.
orxVECTOR position = {}; orxVECTOR position = {0, 0, 0}; orxVECTOR position = orxVECTOR_0; orxVECTOR position;
position.fX = 0;
position.fY = 0;
position.fZ = 0;
orxVECTOR position;
orxVector_Set(&position, orx2F(0.0f), orx2F(0), orxFLOAT_0);text/html2025-09-30T17:26:19+00:00Anonymous (anonymous@undisclosed.example.com)Math Examples
https://orx-project.org/wiki/en/examples/maths/main?rev=1759253179&do=diff
Math Examples
angle_degrees_to_vector
Convert Angle (degrees) to a directional vector
return_object_in_boxed_area
Return an Object within a boxed area
initialising_an_orxvector
Initialising an orxVECTOR
rotate_a_point_around_a_center
Rotate a point around a center
generating_random_numbers
Generating random numbers
convert_vector_to_radian_angle
Convert a Vector to an Angle (radian)
two_component_vectors
Two Component Vectorstext/html2025-09-30T17:26:19+00:00Anonymous (anonymous@undisclosed.example.com)Return an Object within a boxed area
https://orx-project.org/wiki/en/examples/maths/return_object_in_boxed_area?rev=1759253179&do=diff
Return an Object within a boxed area
TODO: Note this example is slightly out of date and needs fixing.
orxOBJECT* GetObjectInTheArea(){
orxVECTOR objectPickVector;
objectPickVector.fX = 878;
objectPickVector.fY = 1185;
objectPickVector.fZ = -1.0;
orxOBOX objectBoxArea;
orxVECTOR pivot = {0, 0, 0};
orxVECTOR position;
position.fX = 834;
position.fY = 1150;
position.fZ = -0.1;
orxVECTOR size;
size.fX = 21;
…text/html2025-09-30T17:26:19+00:00Anonymous (anonymous@undisclosed.example.com)Rotate a point around a center
https://orx-project.org/wiki/en/examples/maths/rotate_a_point_around_a_center?rev=1759253179&do=diff
Rotate a point around a center
Code
// Point to rotate
orxVECTOR point = orxVECTOR_0;
orxVector_Set(&point,100,-100,0);
// Center of rotation
orxVECTOR center = orxVECTOR_0;
orxVector_Set(¢er,50,-50,0);
// New location of point after rotation
orxVECTOR result = orxVECTOR_0;
// Angle of rotation
float angle = 30;
// Translate the point back to origin
orxVector_Sub(&result, &point, ¢er);
// Rotate the point
orxVector_2DRotate(&result, &resu…text/html2025-09-30T17:26:19+00:00Anonymous (anonymous@undisclosed.example.com)Two-component Vector Literals
https://orx-project.org/wiki/en/examples/maths/two_component_vectors?rev=1759253179&do=diff
Two-component Vector Literals
Normally, vectors are expressed as 3 component:
[Object]
Position = (100, 100, 0)
As Orx is a 2D engine, you can express them as two component:
[Object]
Position = (100, 100)
The third component will be 0 by default. This can be done with any vector type.