80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
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#include "Component_Physics.h"
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#include "Entity.h"
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#include "Types.h"
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#include "util/tree.h"
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#include <stdlib.h>
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static const double EPS = 1e-6;
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static inline double dabs(double x) {
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return x < 0 ? -x : x;
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}
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void _physics_MoveX(System_Physics *sys, Entity *e, Duration deltaTime) {
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double delta = e->position->velocity.x * duration_Seconds(deltaTime);
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if (dabs(delta) < EPS)
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return;
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for (tree_Node *i = tree_FirstNode(sys->hit);
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i != NULL;
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i = tree_Node_Next(i)) {
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Component_Hitbox *tohit = *((Component_Hitbox **)i->data);
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if (!tohit->fixed)
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continue;
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if (box2_Intersects(tohit->box, box2_OffsetX(e->hitbox->box, delta), NULL)) {
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if (delta > 0) {
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// Moves right, hits left edge
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double maxdelta = tohit->box.lefttop.x - e->hitbox->box.lefttop.x - e->hitbox->box.size.x;
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delta = maxdelta - EPS;
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} else {
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// Moves left, hits right edge
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double maxdelta = tohit->box.lefttop.x - e->hitbox->box.lefttop.x + tohit->box.size.x;
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delta = maxdelta + EPS;
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}
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}
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if (dabs(delta) < EPS)
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break;
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}
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if (dabs(delta) > EPS)
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e->position->position.x += delta;
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}
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void _physics_MoveY(System_Physics *sys, Entity *e, Duration deltaTime) {
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double delta = e->position->velocity.y * duration_Seconds(deltaTime);
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if (dabs(delta) < EPS)
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return;
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for (tree_Node *i = tree_FirstNode(sys->hit);
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i != NULL;
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i = tree_Node_Next(i)) {
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Component_Hitbox *tohit = *((Component_Hitbox **)i->data);
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if (!tohit->fixed)
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continue;
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if (box2_Intersects(tohit->box, box2_OffsetY(e->hitbox->box, delta), NULL)) {
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if (delta > 0) {
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// Moves down, hits top edge
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double maxdelta = tohit->box.lefttop.y - e->hitbox->box.lefttop.y - e->hitbox->box.size.y;
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delta = maxdelta - EPS;
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} else {
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// Moves up, hits bottom edge
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double maxdelta = tohit->box.lefttop.y - e->hitbox->box.lefttop.y + tohit->box.size.y;
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delta = maxdelta + EPS;
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}
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}
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if (dabs(delta) < EPS)
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break;
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}
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if (dabs(delta) > EPS)
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e->position->position.y += delta;
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}
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