From cdd751dc2f5bf0851c795587aab4fd547e95b6a8 Mon Sep 17 00:00:00 2001
From: Egor Yusov <egor.yusov@gmail.com>
Date: Sat, 20 May 2017 13:20:23 -0700
Subject: Added asteroids sample

---
 Projects/Asteroids/src/camera.cpp | 170 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 170 insertions(+)
 create mode 100644 Projects/Asteroids/src/camera.cpp

(limited to 'Projects/Asteroids/src/camera.cpp')

diff --git a/Projects/Asteroids/src/camera.cpp b/Projects/Asteroids/src/camera.cpp
new file mode 100644
index 0000000..ac5ceec
--- /dev/null
+++ b/Projects/Asteroids/src/camera.cpp
@@ -0,0 +1,170 @@
+// Copyright 2014 Intel Corporation All Rights Reserved
+//
+// Intel makes no representations about the suitability of this software for any purpose.  
+// THIS SOFTWARE IS PROVIDED ""AS IS."" INTEL SPECIFICALLY DISCLAIMS ALL WARRANTIES,
+// EXPRESS OR IMPLIED, AND ALL LIABILITY, INCLUDING CONSEQUENTIAL AND OTHER INDIRECT DAMAGES,
+// FOR THE USE OF THIS SOFTWARE, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY
+// RIGHTS, AND INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+// Intel does not assume any responsibility for any errors which may appear in this software
+// nor any responsibility to update it.
+
+#include "camera.h"
+#include "util.h"
+#include <algorithm>
+
+using namespace DirectX;
+
+
+OrbitCamera::OrbitCamera()
+{
+    // Defaults
+    mCenter = XMVectorSet(0, 0, 0, 0);
+    mUp = XMVectorSet(0, 1, 0, 0);
+    mRadius = 1.0f;
+    mMinRadius = 1.0f;
+    mMaxRadius = 1.0f;
+    mLongAngle = 0.0f;
+    mLatAngle = 0.0f;
+
+    // Set up interaction context (i.e. touch input processing, etc)
+    ThrowIfFailed(CreateInteractionContext(&mInteractionContext));
+    ThrowIfFailed(SetPropertyInteractionContext(mInteractionContext, INTERACTION_CONTEXT_PROPERTY_FILTER_POINTERS, TRUE));
+
+    {
+        INTERACTION_CONTEXT_CONFIGURATION config[] = 
+        {
+            {INTERACTION_ID_MANIPULATION,
+                INTERACTION_CONFIGURATION_FLAG_MANIPULATION |
+                INTERACTION_CONFIGURATION_FLAG_MANIPULATION_TRANSLATION_X |
+                INTERACTION_CONFIGURATION_FLAG_MANIPULATION_TRANSLATION_Y |
+                INTERACTION_CONFIGURATION_FLAG_MANIPULATION_SCALING |
+                INTERACTION_CONFIGURATION_FLAG_MANIPULATION_TRANSLATION_INERTIA |
+                INTERACTION_CONFIGURATION_FLAG_MANIPULATION_SCALING_INERTIA |
+                INTERACTION_CONFIGURATION_FLAG_MANIPULATION_MULTIPLE_FINGER_PANNING
+            },
+        };
+
+        ThrowIfFailed(SetInteractionConfigurationInteractionContext(mInteractionContext, ARRAYSIZE(config), config));
+    }
+
+    ThrowIfFailed(RegisterOutputCallbackInteractionContext(mInteractionContext, OrbitCamera::StaticInteractionOutputCallback, this));
+}
+
+
+OrbitCamera::~OrbitCamera()
+{
+    DestroyInteractionContext(mInteractionContext);
+}
+
+
+void OrbitCamera::View(
+    DirectX::XMVECTOR center, float radius, float minRadius, float maxRadius,
+    float longAngle, float latAngle)
+{
+    mCenter = center;
+    mRadius = radius;
+    mMinRadius = minRadius;
+    mMaxRadius = maxRadius;
+    mLongAngle = longAngle;
+    mLatAngle = latAngle;
+    UpdateData();
+}
+
+
+void OrbitCamera::Projection(float fov, float aspect)
+{
+    float fovY = (aspect <= 1.0 ? fov : fov / aspect);
+    mProjection = XMMatrixPerspectiveFovRH(fovY, aspect, 10000.0f, 0.1f);
+    UpdateData();
+}
+
+
+void OrbitCamera::UpdateData()
+{
+    mEye = XMVectorSet(
+        mRadius * std::sin(mLatAngle) * std::cos(mLongAngle),
+        mRadius * std::cos(mLatAngle),
+        mRadius * std::sin(mLatAngle) * std::sin(mLongAngle),
+        0.0f);
+
+    mView = XMMatrixLookAtRH(mEye, mCenter, mUp);
+    mViewProjection = XMMatrixMultiply(mView, mProjection);
+}
+
+
+void OrbitCamera::OrbitX(float angle)
+{
+    mLongAngle += angle;
+    UpdateData();
+}
+
+
+void OrbitCamera::OrbitY(float angle)
+{
+    float limit = XM_PI * 0.01f;
+    mLatAngle = std::max(limit, std::min(XM_PI-limit, mLatAngle + angle));
+    UpdateData();
+}
+
+
+void OrbitCamera::ZoomRadius(float delta)
+{
+    mRadius = std::max(mMinRadius, std::min(mMaxRadius, mRadius + delta));
+    UpdateData();
+}
+
+void OrbitCamera::ZoomRadiusScale(float delta)
+{
+    mRadius = std::max(mMinRadius, std::min(mMaxRadius, mRadius * delta));
+    UpdateData();
+}
+
+
+void OrbitCamera::AddPointer(UINT pointerId)
+{
+    AddPointerInteractionContext(mInteractionContext, pointerId);
+}
+
+
+void OrbitCamera::ProcessPointerFrames(UINT pointerId, const POINTER_INFO* pointerInfo)
+{
+    ProcessPointerFramesInteractionContext(mInteractionContext, 1, 1, pointerInfo);
+}
+
+
+void OrbitCamera::RemovePointer(UINT pointerId)
+{
+    RemovePointerInteractionContext(mInteractionContext, pointerId);
+}
+
+
+void OrbitCamera::ProcessInertia()
+{
+    ProcessInertiaInteractionContext(mInteractionContext);
+}
+
+
+VOID CALLBACK OrbitCamera::StaticInteractionOutputCallback(VOID *clientData, const INTERACTION_CONTEXT_OUTPUT *output)
+{
+    auto camera = reinterpret_cast<OrbitCamera*>(clientData);
+    camera->InteractionOutputCallback(output);
+}
+
+
+void OrbitCamera::InteractionOutputCallback(const INTERACTION_CONTEXT_OUTPUT *output)
+{
+    switch(output->interactionId)
+    {
+    case INTERACTION_ID_MANIPULATION: {
+        auto delta = &output->arguments.manipulation.delta;
+        OrbitX(delta->translationX * 0.0007f);
+        OrbitY(-delta->translationY * 0.0007f);
+        ZoomRadiusScale(1.0f / delta->scale);
+
+        break;
+    }
+
+    default:
+        break;
+    }
+}
-- 
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