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58 lines
1.3 KiB
C++
58 lines
1.3 KiB
C++
#ifndef COMPONENTS_SOLID_HPP
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#define COMPONENTS_SOLID_HPP
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#include "components/point.hpp"
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#include "window.hpp"
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#include <algorithm>
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#include <cstdint>
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#include <string>
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class Solid {
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public:
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Solid(std::string path) {
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bitmap = sdl2LoadSolid(path.c_str());
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}
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~Solid() {
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if (bitmap != nullptr)
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SDL_FreeSurface(bitmap);
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}
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float collision(Vec2 p) const noexcept {
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float dy = 0.f;
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if (at(p)) {
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auto up = p;
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while (up.y > 0 && at(up))
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up.y--;
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auto down = p;
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while (down.y < bitmap->h && at(down))
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down.y++;
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if (down.y - p.y > p.y - up.y)
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dy = -(p.y - up.y);
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else
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dy = down.y - p.y;
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}
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return dy;
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}
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private:
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SDL_Surface *bitmap;
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bool at(Vec2 p) const noexcept {
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const auto bm = reinterpret_cast<std::uint8_t *>(bitmap->pixels);
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const int x = std::clamp(static_cast<int>(p.x), 0, bitmap->w);
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const int y = std::clamp(static_cast<int>(p.y), 0, bitmap->h);
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const int i = y * bitmap->w + x;
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const auto val = bm[i * bitmap->format->BytesPerPixel];
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return val > 0;
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}
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};
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#endif // COMPONENTS_SOLID_HPP
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