68 lines
1.1 KiB
C++
68 lines
1.1 KiB
C++
#pragma once
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#include <stdint.h>
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namespace screen_offset
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{
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// the origin is at this offset in screen space
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constexpr int32_t x = 4;
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constexpr int32_t y = 4;
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}
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struct offset_t { // in pixels
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int32_t x;
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int32_t y;
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};
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struct world_t;
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struct block_t {
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int32_t x;
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int32_t y;
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};
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struct screen_t {
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int32_t x;
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int32_t y;
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constexpr inline world_t to_world(const world_t& origin) const;
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};
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struct world_t {
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int32_t x;
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int32_t y;
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constexpr inline screen_t to_screen(const world_t& origin) const;
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constexpr inline block_t to_block() const;
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};
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// screen_t
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constexpr inline world_t screen_t::to_world(const world_t& origin) const
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{
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return {
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(origin.x - screen_offset::x) + x,
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(origin.y - screen_offset::y) + y,
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};
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}
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// world_t
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constexpr inline screen_t world_t::to_screen(const world_t& origin) const
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{
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return {
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-origin.x + screen_offset::x + x,
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-origin.y + screen_offset::y + y,
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};
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}
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constexpr inline block_t world_t::to_block() const
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{
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// division function must round towards negative infinity
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// right shift provides that property
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return {
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x >> 1,
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y >> 1,
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};
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}
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