47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
#include "header.h"
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#include <raymath.h>
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#include <math.h>
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// Target is circular, thus a kinematic obj has w=h
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struct target_obj init_target(){
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return (struct target_obj){
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.radius = 12,
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.kinematic = init_kinematic_obj(12, 12)
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};
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}
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bool collide_target(struct kinematic_obj *obj, struct target_obj *target){
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/* The method is based off SAT
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*/
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Vector2 obj_center = center(obj->rect);
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Vector2 target_center = center(target->kinematic.rect);
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float dist = Vector2Distance(obj_center, target_center);
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if (dist < target->radius)
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return true;
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double max_dim = fmax(obj->rect.width, obj->rect.height);
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if (dist > max_dim + target->radius)
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return false;
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Vector2 n = Vector2Subtract(target_center, obj_center);
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n = Vector2Normalize(n);
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Vector2 pos_check = obj->pos;
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double obj_proj1 = Vector2DotProduct(pos_check, n);
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pos_check.x += obj->rect.width;
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double obj_proj2 = Vector2DotProduct(pos_check, n);
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pos_check.y += obj->rect.height;
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double obj_proj3 = Vector2DotProduct(pos_check, n);
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pos_check.x -= obj->rect.width;
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double obj_proj4 = Vector2DotProduct(pos_check, n);
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double min_proj = fmin(fmin(fmin(obj_proj1, obj_proj2), obj_proj3), obj_proj4);
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double max_proj = fmax(fmax(fmax(obj_proj1, obj_proj2), obj_proj3), obj_proj4);
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double target_proj = Vector2DotProduct(target_center, n);
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if (!(max_proj < target_proj - target->radius) && !(min_proj > target_proj + target->radius))
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return true;
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return false;
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} |