40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
#include "platform_world.h"
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#include <algorithm>
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namespace ns_game {
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MovementBody PlatformMover::Step(const MovementBody& body,
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const PlatformWorld& world, float gravity,
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float deltaTime) const {
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MovementBody next = body;
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const frostbite2D::Vec2 previousPosition = next.position;
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next.velocity.y += gravity * deltaTime;
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next.position += next.velocity * deltaTime;
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next.grounded = false;
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const float previousBottom = previousPosition.y + next.size.y;
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const float newBottom = next.position.y + next.size.y;
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for (const auto& platform : world.platforms) {
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const bool horizontallyOverlaps =
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next.position.x + next.size.x > platform.left() &&
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next.position.x < platform.right();
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const bool wasAbove = previousBottom <= platform.top() + 4.0f;
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const bool crossedTop = newBottom >= platform.top();
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if (next.velocity.y >= 0.0f && horizontallyOverlaps && wasAbove &&
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crossedTop) {
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next.position.y = platform.top() - next.size.y;
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next.velocity.y = 0.0f;
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next.grounded = true;
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}
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}
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next.position.x =
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std::clamp(next.position.x, world.levelLeft, world.levelRight - next.size.x);
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return next;
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}
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} // namespace ns_game
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