geom.h File Reference

#include <math.h>
#include <stdbool.h>

Go to the source code of this file.

Functions
double	bl_distance_xy (double x0, double y0, double x1, double y1)
bool	bl_xy_in_rect (double x, double y, double rx, double ry, double rw, double rh)
bool	bl_xy_in_circle (double x, double y, double cx, double cy, double cr)
double	bl_xy_magnitude (double x, double y)
bool	bl_circle_intersect (double cx0, double cy0, double cr0, double cx1, double cy1, double cr1)
double	bl_bezier (double x0, double x1, double x2, double x3, double t)
double	bl_quadratic_bezier (double x0, double x1, double x2, double t)

Function Documentation

bl_bezier()

double bl_bezier	(	double	x0,
		double	x1,
		double	x2,
		double	x3,
		double	t
	)

Returns a one-dimensional Bezier interpolation of four other values.

Normally this would be applied to both the x and y values of a 2d point.

Parameters

double	x0 The first point.
double	x1 The second point.
double	x2 The third point.
double	x3 The fourth point.
double	t The interpolation value.

Examples

double x = bl_bezier(100, 200, 300, 400, 0.4);
double y = bl_bezier(100, 0, 300, 100, 0.4);

bl_circle_intersect()

bool bl_circle_intersect	(	double	cx0,
		double	cy0,
		double	cr0,
		double	cx1,
		double	cy1,
		double	cr1
	)

Returns whether or not two circles are intersecting.

Parameters

double	cx0 The x position of the first circle.
double	cy0 The y position of the first circle.
double	cr0 The radius of the first circle.
double	cx1 The x position of the second circle.
double	cy1 The y position of the second circle.
double	cr1 The radius of the second circle.

Returns

double

Examples

bool collision = bl_circle_intersect(100, 100, 50, 150, 150, 100);

bl_distance_xy()

double bl_distance_xy	(	double	x0,
		double	y0,
		double	x1,
		double	y1
	)

Returns the distance between two x, y points.

Parameters

double	x0 The x value of the first point.
double	y0 The y value of the first point.
double	x1 The x value of the second point.
double	y1 The y value of the second point.

Returns

double

Examples

double dist = bl_distance_xy(100, 100, 200, 200);

bl_quadratic_bezier()

double bl_quadratic_bezier	(	double	x0,
		double	x1,
		double	x2,
		double	t
	)

Returns a one-dimensional quadratic Bezier interpolation of three other values.

Normally this would be applied to both the x and y values of a 2d point.

Parameters

double	x0 The first point.
double	x1 The second point.
double	x2 The third point.
double	t The interpolation value.

Examples

double x = bl_quadratic_bezier(100, 200, 300, 0.4);
double y = bl_quadratic_bezier(100, 0, 300, 0.4);

bl_xy_in_circle()

bool bl_xy_in_circle	(	double	x,
		double	y,
		double	cx,
		double	cy,
		double	cr
	)

Returns whether or not an x, y point is within a circle.

Parameters

double	x The x value of the point.
double	y The y value of the point.
double	cx The x position of the circle.
double	cy The y position of the circle.
double	cr The radius of the circle.

Returns

bool

Examples

bool in_circle = bl_xy_in_circle(100, 100, 150, 150, 100);

bl_xy_in_rect()

bool bl_xy_in_rect	(	double	x,
		double	y,
		double	rx,
		double	ry,
		double	rw,
		double	rh
	)

Returns whether or not an x, y point is within a rectangle.

Parameters

double	x The x value of the point.
double	y The y value of the point.
double	rx The x position of the rectangle.
double	ry The y position of the rectangle.
double	rw The width of the rectangle.
double	rh The height of the rectangle.

Returns

double

Examples

bool in_rect = bl_xy_in_rect(100, 100, 50, 50, 200, 300);

bl_xy_magnitude()

double bl_xy_magnitude	(	double	x,
		double	y
	)

Returns the magnitude (distance from origin) of an x, y point.

Parameters

double	x The x value of the point.
double	y The y value of the point.

Returns

double

Examples

double mag = bl_xy_magnitude(100, 200);