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89 lines
2.7 KiB
89 lines
2.7 KiB
#define OLC_PGE_APPLICATION
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#include "pixelGameEngine.h"
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#include "olcutils.h"
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using namespace olc;
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class Example : public olc::PixelGameEngine
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{
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public:
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Example()
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{
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sAppName = "Example";
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}
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public:
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bool RayVsRect(const vf2d ray_origin, const vf2d ray_dir, const olc::utils::geom2d::rect<float> target, vf2d&contact_point, vf2d&contact_normal, float&t_hit_near){
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contact_normal = { 0, 0 };
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contact_point = { 0, 0 };
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vf2d t_near = {(target.pos.x - ray_origin.x) / ray_dir.x, (target.pos.y - ray_origin.y) / ray_dir.y};
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vf2d t_far = {(target.pos.x + target.size.x - ray_origin.x) / ray_dir.x, (target.pos.y + target.size.y - ray_origin.y) / ray_dir.y};
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if (t_near.x > t_far.x) {float b; b = t_near.x; t_near.x = t_far.x; t_far.x = b;};
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if (t_near.y > t_far.y) {float b; b = t_near.y; t_near.y = t_far.y; t_far.y = b;};
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if (t_near.x > t_far.y || t_near.y > t_far.x) return false;
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t_hit_near = fmax(t_near.x, t_near.y);
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float t_hit_far = fmin(t_far.x, t_far.y);
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if (t_hit_far < 0) return false;
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contact_point.x = ray_origin.x + t_hit_near * ray_dir.x;
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contact_point.y = ray_origin.y + t_hit_near * ray_dir.y;
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if (t_near.x > t_near.y)
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if ( 1.0f / ray_dir.x < 0)
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contact_normal = { 1, 0 };
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else
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contact_normal = { -1, 0};
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else
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if ( t_near.x < t_near.y)
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if ( 1.0f / ray_dir.y < 0)
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contact_normal = { 0, 1 };
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else
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contact_normal = { 0, -1 };
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return true;
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}
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vf2d originPoint={16,16};
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bool OnUserCreate() override
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{
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// Called once at the start, so create things here
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return true;
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}
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bool OnUserUpdate(float fElapsedTime) override
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{
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vf2d velocity={(GetKey(D).bHeld-GetKey(A).bHeld)*20*fElapsedTime,(GetKey(S).bHeld-GetKey(W).bHeld)*20*fElapsedTime};
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vf2d contact_point;
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vf2d contact_normal;
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float t_hit_near;
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Clear(Pixel(64,64,255));
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if (!olc::utils::geom2d::overlaps(olc::utils::geom2d::circle<float>{originPoint+velocity,5},olc::utils::geom2d::rect<float>{{32,32},{64,32}})) {
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originPoint+=velocity;
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DrawCircle(originPoint,5);
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} else {
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DrawCircle(originPoint,5,RED);
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}
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DrawLine(originPoint,GetMousePos());
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DrawRect({32,32},{64,32},RayVsRect(originPoint, GetMousePos()-originPoint, olc::utils::geom2d::rect<float>{{32,32},{64,32}},contact_point,contact_normal,t_hit_near)&&t_hit_near<1?YELLOW:WHITE);
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return true;
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}
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};
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int main()
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{
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Example demo;
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if (demo.Construct(128, 120, 8, 8))
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demo.Start();
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return 0;
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}
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