From a645524d19bb9183d4eece72bf8945bba4bed3a0 Mon Sep 17 00:00:00 2001
From: Kelly Rauchenberger <fefferburbia@gmail.com>
Date: Tue, 16 Feb 2021 22:03:10 -0500
Subject: Added scriptable camera panning

---
 src/camera_system.cpp | 63 +++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 49 insertions(+), 14 deletions(-)

(limited to 'src/camera_system.cpp')

diff --git a/src/camera_system.cpp b/src/camera_system.cpp
index b7627b1..2d7be61 100644
--- a/src/camera_system.cpp
+++ b/src/camera_system.cpp
@@ -6,26 +6,39 @@
 void CameraSystem::tick(double dt) {
   if (!locked_ && followingSprite_ != -1) {
     const Sprite& follow = game_.getSprite(followingSprite_);
-    const Map& map = game_.getMap();
-    vec2i mapBounds = map.getMapSize() * map.getTileSize();
 
-    pos_ = follow.loc - vec2i{0, 16} - (fov_ / 2);
+    pos_ = calculatePosWithCenter(follow.loc - vec2i{0, 16});
+  }
 
-    if (pos_.x() < 0) {
-      pos_.x() = 0;
-    }
-    if (pos_.y() < 0) {
-      pos_.y() = 0;
-    }
-    if (pos_.x() + fov_.w() >= mapBounds.w()) {
-      pos_.x() = mapBounds.w() - fov_.w() - 1;
-    }
-    if (pos_.y() + fov_.h() >= mapBounds.h()) {
-      pos_.y() = mapBounds.h() - fov_.h() - 1;
+  if (panning_) {
+    panThus_ += dt;
+
+    if (panThus_ >= panLength_) {
+      panning_ = false;
+      pos_ = panEnd_;
+    } else {
+      pos_.x() = static_cast<double>((panEnd_ - panStart_).x()) / panLength_ * panThus_ + panStart_.x();
+      pos_.y() = static_cast<double>((panEnd_ - panStart_).y()) / panLength_ * panThus_ + panStart_.y();
     }
   }
 }
 
+void CameraSystem::panToSprite(int targetId, int length) {
+  locked_ = true;
+
+  const Sprite& target = game_.getSprite(targetId);
+
+  if (length > 0) {
+    panning_ = true;
+    panStart_ = pos_;
+    panEnd_ = calculatePosWithCenter(target.loc - vec2i{0, 16});
+    panLength_ = length;
+    panThus_ = 0.0;
+  } else {
+    pos_ = calculatePosWithCenter(target.loc - vec2i{0, 16});
+  }
+}
+
 void CameraSystem::destroySprite(int spriteId) {
   if (followingSprite_ == spriteId) {
     followingSprite_ = -1;
@@ -35,3 +48,25 @@ void CameraSystem::destroySprite(int spriteId) {
 void CameraSystem::clearSpriteCache() {
   followingSprite_ = -1;
 }
+
+vec2i CameraSystem::calculatePosWithCenter(vec2i center) const {
+  const Map& map = game_.getMap();
+  vec2i mapBounds = map.getMapSize() * map.getTileSize();
+
+  vec2i result = center - (fov_ / 2);
+
+  if (result.x() < 0) {
+    result.x() = 0;
+  }
+  if (result.y() < 0) {
+    result.y() = 0;
+  }
+  if (result.x() + fov_.w() >= mapBounds.w()) {
+    result.x() = mapBounds.w() - fov_.w() - 1;
+  }
+  if (result.y() + fov_.h() >= mapBounds.h()) {
+    result.y() = mapBounds.h() - fov_.h() - 1;
+  }
+
+  return result;
+}
-- 
cgit 1.4.1