polygon.cpp File Reference

#include "polygon.h"
#include "scrollarea.h"

Classes
struct	Edge2D

Functions
void	calculate_intersection (float y, Edge2D *e)
bool	less (const Edge2D *e1, const Edge2D *e2)
void	merge (int n, int m, Edge2D e[], Edge2D t[])
void	merge_sort (int n, Edge2D e[], Edge2D t[])
void	render_scanline (float x1, float x2, int y, int ch)
void	process_scanline (int y, int n, Edge2D edge[], Edge2D temp[], int ch)
void	render_polygon (int n, const Vec2 vertex[], int ch)
	render a polygon with n vertices More...
void	render_triangle (const Vec2 &v1, const Vec2 &v2, const Vec2 &v3, int ch)
	render a triangle with 3 vertices More...

Function Documentation

calculate_intersection()

void calculate_intersection	(	float	y,
		Edge2D *	e
	)

less()

bool less	(	const Edge2D *	e1,
		const Edge2D *	e2
	)

merge()

void merge	(	int	n,
		int	m,
		Edge2D	e[],
		Edge2D	t[]
	)

merge_sort()

void merge_sort	(	int	n,
		Edge2D	e[],
		Edge2D	t[]
	)

process_scanline()

void process_scanline	(	int	y,
		int	n,
		Edge2D	edge[],
		Edge2D	temp[],
		int	ch
	)

render_polygon()

void render_polygon	(	int	n,
		const Vec2	vertex[],
		int	ch = -1
	)

render a polygon with n vertices

• the polygon can be self-intersecting
• the polygon is transformed with the actual transformation matrix
• the transformation matrix can be modified via:
  • translate, rotate & scale
  • push & pop

render_scanline()

void render_scanline	(	float	x1,
		float	x2,
		int	y,
		int	ch
	)

render_triangle()

void render_triangle	(	const Vec2 &	v1,
		const Vec2 &	v2,
		const Vec2 &	v3,
		int	ch
	)

render a triangle with 3 vertices