今日目標

• 繼續Debug Ray vs Rect的部分

MISSION FAILED!

QAQ 今天又很晚下班了 只有單純的把昨天的部分再抄一遍，但還是理解不能....，目前我先測試上傳了，可能要到假日有時間再來理解可能會比較好，腦袋會比較清楚，然後這是我原本寫的，很亂，目前比較看不出問題在哪>

            ray_dir = V2F_ZERO;
            contact_point = V2F_ZERO;
            contact_norm = V2F_ZERO;
            hit_near = false;
            is_hit = true;

            ray_dir = V2fSub(end_point, start_point);

            V2f min_pos = obstacle.pos;
            V2f near = V2fSub(min_pos, start_point);
            near.x /= ray_dir.x;
            near.y /= ray_dir.y;

            V2f max_pos = { obstacle.pos.x + obstacle.rec.w, obstacle.pos.y + obstacle.rec.h };
            V2f far = V2fSub( max_pos, start_point);
            far.x /= ray_dir.x;
            far.y /= ray_dir.y;

            if (near.x > far.x) {
                float tmp = near.x;
                near.x = far.x;
                far.x = tmp;
            }

            if (near.y > far.y) {
                float tmp = near.y;
                near.y = far.y;
                far.y = tmp;
            }

            if (near.x > far.y || near.y > far.x) {
                is_hit = false;
            }

            if (near.x > near.y) {
                hit_near = near.x;
            } else {
                hit_near = near.y;
            }

            contact_point = V2fAdd(V2fScalef(ray_dir, hit_near), start_point);

            if (near.x > near.y) {
                if (ray_dir.x < 0.0f) {
                    contact_norm.x = 1.0f;
                    contact_norm.y = 0.0f;
                } else {
                    contact_norm.x = -1.0f;
                    contact_norm.y = 0.0f;
                }
            } else if (near.x < near.y) {
                if (ray_dir.x < 0.0f) {
                    contact_norm.x = 0.0f;
                    contact_norm.y = -1.0f;
                } else {
                    contact_norm.x = 0.0f;
                    contact_norm.y = 1.0f;
                }
            }

            if (hit_near > 1.0f) {
                is_hit = false;
            }

參考 抄自

• OneLoneCoder_PGE_Rectangles.cpp