Zack Buhman
e6cae1c242
This also adds interactive player movement. I am much more satisfied with the coordinate space math in this commit compared to the previous commit.
68 lines
1.1 KiB
C++
68 lines
1.1 KiB
C++
#pragma once
|
|
|
|
#include <stdint.h>
|
|
|
|
namespace screen_offset
|
|
{
|
|
// the origin is at this offset in screen space
|
|
constexpr int32_t x = 4;
|
|
constexpr int32_t y = 4;
|
|
}
|
|
|
|
struct offset_t { // in pixels
|
|
int32_t x;
|
|
int32_t y;
|
|
};
|
|
|
|
struct block_t {
|
|
int32_t x;
|
|
int32_t y;
|
|
};
|
|
|
|
struct world_t;
|
|
|
|
struct screen_t {
|
|
int32_t x;
|
|
int32_t y;
|
|
|
|
constexpr inline world_t to_world(const world_t& origin) const;
|
|
};
|
|
|
|
struct world_t {
|
|
int32_t x;
|
|
int32_t y;
|
|
|
|
constexpr inline screen_t to_screen(const world_t& origin) const;
|
|
constexpr inline block_t to_block() const;
|
|
};
|
|
|
|
// screen_t
|
|
|
|
constexpr inline world_t screen_t::to_world(const world_t& origin) const
|
|
{
|
|
return {
|
|
(origin.x - screen_offset::x) + x,
|
|
(origin.y - screen_offset::y) + y,
|
|
};
|
|
}
|
|
|
|
// world_t
|
|
|
|
constexpr inline screen_t world_t::to_screen(const world_t& origin) const
|
|
{
|
|
return {
|
|
-origin.x + screen_offset::x + x,
|
|
-origin.y + screen_offset::y + y,
|
|
};
|
|
}
|
|
|
|
constexpr inline block_t world_t::to_block() const
|
|
{
|
|
// division function must round towards negative infinity
|
|
// right shift provides that property
|
|
return {
|
|
x >> 1,
|
|
y >> 1,
|
|
};
|
|
}
|