From 77be863f4f15d2481a64e4e8dadb4060a6e4e590 Mon Sep 17 00:00:00 2001
From: Kelly Rauchenberger <fefferburbia@gmail.com>
Date: Sun, 11 Feb 2018 12:34:52 -0500
Subject: Implemented map rendering and basic collision

Only wall and platform collision currently works, and map edges are not currently implemented.
---
 src/systems/pondering.cpp | 248 ++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 242 insertions(+), 6 deletions(-)

(limited to 'src/systems/pondering.cpp')

diff --git a/src/systems/pondering.cpp b/src/systems/pondering.cpp
index e40db1d..26a6f56 100644
--- a/src/systems/pondering.cpp
+++ b/src/systems/pondering.cpp
@@ -2,6 +2,8 @@
 #include "game.h"
 #include "components/ponderable.h"
 #include "components/transformable.h"
+#include "components/droppable.h"
+#include "consts.h"
 
 void PonderingSystem::tick(double dt)
 {
@@ -9,17 +11,251 @@ void PonderingSystem::tick(double dt)
     PonderableComponent,
     TransformableComponent>();
 
+  auto maps = game_.getEntityManager().getEntitiesWithComponents<
+    MappableComponent>();
+
   for (id_type entity : entities)
   {
-    auto& transformable = game_.getEntityManager().getComponent<TransformableComponent>(entity);
-    auto& ponderable = game_.getEntityManager().getComponent<PonderableComponent>(entity);
+    auto& transformable = game_.getEntityManager().
+      getComponent<TransformableComponent>(entity);
+
+    auto& ponderable = game_.getEntityManager().
+      getComponent<PonderableComponent>(entity);
 
     // Accelerate
-    ponderable.setVelocityX(ponderable.getVelocityX() + ponderable.getAccelX() * dt);
-    ponderable.setVelocityY(ponderable.getVelocityY() + ponderable.getAccelY() * dt);
+    ponderable.setVelocityX(
+      ponderable.getVelocityX() + ponderable.getAccelX() * dt);
+
+    ponderable.setVelocityY(
+      ponderable.getVelocityY() + ponderable.getAccelY() * dt);
+
+    const double oldX = transformable.getX();
+    const double oldY = transformable.getY();
+    const double oldRight = oldX + transformable.getW();
+    const double oldBottom = oldY + transformable.getH();
+
+    double newX = oldX + ponderable.getVelocityX() * dt;
+    double newY = oldY + ponderable.getVelocityY() * dt;
+
+    if (ponderable.getVelocityY() > 0.0)
+    {
+      ponderable.setState(PonderableComponent::State::falling);
+    }
+
+    for (id_type mapEntity : maps)
+    {
+      auto& mappable = game_.getEntityManager().
+        getComponent<MappableComponent>(mapEntity);
+
+      if (newX < oldX)
+      {
+        for (auto it = mappable.getLeftBoundaries().lower_bound(oldX);
+          (it != std::end(mappable.getLeftBoundaries())) && (it->first >= newX);
+          it++)
+        {
+          if ((oldBottom > it->second.getLower())
+            && (oldY < it->second.getUpper()))
+          {
+            // We have a collision!
+            processCollision(
+              entity,
+              Direction::left,
+              newX,
+              newY,
+              it->first,
+              it->second.getType());
+
+            break;
+          }
+        }
+      } else if (newX > oldX)
+      {
+        for (auto it = mappable.getRightBoundaries().lower_bound(oldRight);
+          (it != std::end(mappable.getRightBoundaries()))
+            && (it->first <= (newX + transformable.getW()));
+          it++)
+        {
+          if ((oldBottom > it->second.getLower())
+            && (oldY < it->second.getUpper()))
+          {
+            // We have a collision!
+            processCollision(
+              entity,
+              Direction::right,
+              newX,
+              newY,
+              it->first,
+              it->second.getType());
+
+            break;
+          }
+        }
+      }
+
+      if (newY < oldY)
+      {
+        for (auto it = mappable.getUpBoundaries().lower_bound(oldY);
+          (it != std::end(mappable.getUpBoundaries())) && (it->first >= newY);
+          it++)
+        {
+          if ((oldRight > it->second.getLower())
+            && (oldX < it->second.getUpper()))
+          {
+            // We have a collision!
+            processCollision(
+              entity,
+              Direction::up,
+              newX,
+              newY,
+              it->first,
+              it->second.getType());
+
+            break;
+          }
+        }
+      } else if (newY > oldY)
+      {
+        for (auto it = mappable.getDownBoundaries().lower_bound(oldBottom);
+          (it != std::end(mappable.getDownBoundaries()))
+            && (it->first <= (newY + transformable.getH()));
+          it++)
+        {
+          if ((oldRight > it->second.getLower())
+            && (oldX < it->second.getUpper()))
+          {
+            // We have a collision!
+            processCollision(
+              entity,
+              Direction::down,
+              newX,
+              newY,
+              it->first,
+              it->second.getType());
+
+            break;
+          }
+        }
+      }
+    }
 
     // Move
-    transformable.setX(transformable.getX() + ponderable.getVelocityX() * dt);
-    transformable.setY(transformable.getY() + ponderable.getVelocityY() * dt);
+    transformable.setX(newX);
+    transformable.setY(newY);
+  }
+}
+
+void PonderingSystem::initializeBody(
+  id_type entity,
+  PonderableComponent::Type type)
+{
+  auto& ponderable = game_.getEntityManager().
+    emplaceComponent<PonderableComponent>(entity, type);
+
+  if (type == PonderableComponent::Type::freefalling)
+  {
+    ponderable.setAccelY(JUMP_GRAVITY(TILE_HEIGHT*3.5, 0.233));
+    ponderable.setState(PonderableComponent::State::falling);
+  }
+}
+
+void PonderingSystem::processCollision(
+  id_type entity,
+  Direction dir,
+  double& newX,
+  double& newY,
+  int axis,
+  MappableComponent::Boundary::Type type)
+{
+  auto& ponderable = game_.getEntityManager().
+    getComponent<PonderableComponent>(entity);
+
+  auto& transformable = game_.getEntityManager().
+    getComponent<TransformableComponent>(entity);
+
+  switch (type)
+  {
+    case MappableComponent::Boundary::Type::wall:
+    {
+      switch (dir)
+      {
+        case Direction::left:
+        {
+          newX = axis;
+          ponderable.setVelocityX(0.0);
+
+          break;
+        }
+
+        case Direction::right:
+        {
+          newX = axis - transformable.getW();
+          ponderable.setVelocityX(0.0);
+
+          break;
+        }
+
+        case Direction::up:
+        {
+          newY = axis;
+          ponderable.setVelocityY(0.0);
+
+          break;
+        }
+
+        case Direction::down:
+        {
+          newY = axis - transformable.getH();
+          ponderable.setVelocityY(0.0);
+
+          if (ponderable.getState() == PonderableComponent::State::falling)
+          {
+            ponderable.setState(PonderableComponent::State::grounded);
+          }
+
+          break;
+        }
+      }
+
+      break;
+    }
+
+    case MappableComponent::Boundary::Type::platform:
+    {
+      if (game_.getEntityManager().hasComponent<DroppableComponent>(entity))
+      {
+        auto& droppable = game_.getEntityManager().
+          getComponent<DroppableComponent>(entity);
+
+        if (droppable.isDroppable())
+        {
+          droppable.setDroppable(false);
+        } else {
+          newY = axis - transformable.getH();
+          ponderable.setVelocityY(0.0);
+
+          if (ponderable.getState() == PonderableComponent::State::falling)
+          {
+            ponderable.setState(PonderableComponent::State::grounded);
+          }
+        }
+      } else {
+        newY = axis - transformable.getH();
+        ponderable.setVelocityY(0.0);
+
+        if (ponderable.getState() == PonderableComponent::State::falling)
+        {
+          ponderable.setState(PonderableComponent::State::grounded);
+        }
+      }
+
+      break;
+    }
+
+    default:
+    {
+      // Not yet implemented.
+
+      break;
+    }
   }
 }
-- 
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