Squashed 'external/gainput/' content from commit 2be0a50

git-subtree-dir: external/gainput git-subtree-split: 2be0a50089eafcc6fccb66142180082e48f27f4c
2024-01-22 08:51:55 +01:00
commit 4e42229bdd
170 changed files with 31921 additions and 0 deletions
--- a/lib/source/gainput/gestures/GainputPinchGesture.cpp
+++ b/lib/source/gainput/gestures/GainputPinchGesture.cpp
@@ -0,0 +1,120 @@
+
+#include <gainput/gainput.h>
+#include <gainput/gestures/GainputPinchGesture.h>
+
+#ifdef GAINPUT_ENABLE_PINCH_GESTURE
+#include <gainput/GainputInputDeltaState.h>
+#include <gainput/GainputHelpers.h>
+#include <math.h>
+
+namespace gainput
+{
+
+PinchGesture::PinchGesture(InputManager& manager, DeviceId device, unsigned index, DeviceVariant /*variant*/) :
+	InputGesture(manager, device, index),
+	pinching_(false)
+{
+	downButton_.buttonId = InvalidDeviceButtonId;
+	xAxis_.buttonId = InvalidDeviceButtonId;
+	yAxis_.buttonId = InvalidDeviceButtonId;
+	downButton2_.buttonId = InvalidDeviceButtonId;
+	xAxis2_.buttonId = InvalidDeviceButtonId;
+	yAxis2_.buttonId = InvalidDeviceButtonId;
+
+	state_ = manager_.GetAllocator().New<InputState>(manager.GetAllocator(), 2);
+	GAINPUT_ASSERT(state_);
+	previousState_ = manager_.GetAllocator().New<InputState>(manager.GetAllocator(), 2);
+	GAINPUT_ASSERT(previousState_);
+}
+
+PinchGesture::~PinchGesture()
+{
+	manager_.GetAllocator().Delete(state_);
+	manager_.GetAllocator().Delete(previousState_);
+}
+
+void
+PinchGesture::Initialize(DeviceId downDevice, DeviceButtonId downButton, 
+			DeviceId xAxisDevice, DeviceButtonId xAxis, 
+			DeviceId yAxisDevice, DeviceButtonId yAxis, 
+			DeviceId down2Device, DeviceButtonId downButton2, 
+			DeviceId xAxis2Device, DeviceButtonId xAxis2, 
+			DeviceId yAxis2Device, DeviceButtonId yAxis2)
+{
+	downButton_.deviceId = downDevice;
+	downButton_.buttonId = downButton;
+	xAxis_.deviceId = xAxisDevice;
+	xAxis_.buttonId = xAxis;
+	yAxis_.deviceId = yAxisDevice;
+	yAxis_.buttonId = yAxis;
+	downButton2_.deviceId = down2Device;
+	downButton2_.buttonId = downButton2;
+	xAxis2_.deviceId = xAxis2Device;
+	xAxis2_.buttonId = xAxis2;
+	yAxis2_.deviceId = yAxis2Device;
+	yAxis2_.buttonId = yAxis2;
+}
+
+void
+PinchGesture::InternalUpdate(InputDeltaState* delta)
+{
+	if (downButton_.buttonId == InvalidDeviceButtonId
+	 || xAxis_.buttonId == InvalidDeviceButtonId
+	 || yAxis_.buttonId == InvalidDeviceButtonId
+	 || downButton2_.buttonId == InvalidDeviceButtonId
+	 || xAxis2_.buttonId == InvalidDeviceButtonId
+	 || yAxis2_.buttonId == InvalidDeviceButtonId)
+	{
+		return;
+	}
+
+	const InputDevice* downDevice = manager_.GetDevice(downButton_.deviceId);
+	GAINPUT_ASSERT(downDevice);
+	const bool isDown = downDevice->GetBool(downButton_.buttonId);
+
+	const InputDevice* downDevice2 = manager_.GetDevice(downButton2_.deviceId);
+	GAINPUT_ASSERT(downDevice2);
+	const bool isDown2 = downDevice2->GetBool(downButton2_.buttonId);
+
+	if (!isDown || !isDown2)
+	{
+		HandleButton(*this, *state_, delta, PinchTriggered, false);
+		pinching_ = false;
+		return;
+	}
+
+	HandleButton(*this, *state_, delta, PinchTriggered, true);
+
+	const InputDevice* xAxisDevice = manager_.GetDevice(xAxis_.deviceId);
+	GAINPUT_ASSERT(xAxisDevice);
+	const float posX = xAxisDevice->GetFloat(xAxis_.buttonId);
+	const InputDevice* yAxisDevice = manager_.GetDevice(yAxis_.deviceId);
+	GAINPUT_ASSERT(yAxisDevice);
+	const float posY = yAxisDevice->GetFloat(yAxis_.buttonId);
+
+	const InputDevice* xAxis2Device = manager_.GetDevice(xAxis2_.deviceId);
+	GAINPUT_ASSERT(xAxis2Device);
+	const float posX2 = xAxis2Device->GetFloat(xAxis2_.buttonId);
+	const InputDevice* yAxis2Device = manager_.GetDevice(yAxis2_.deviceId);
+	GAINPUT_ASSERT(yAxis2Device);
+	const float posY2 = yAxis2Device->GetFloat(yAxis2_.buttonId);
+
+	const float xd = posX - posX2;
+	const float yd = posY - posY2;
+	const float dist = sqrtf(xd*xd + yd*yd);
+
+	if (!pinching_ && dist > 0.0f)
+	{
+		pinching_ = true;
+		initialDistance_ = dist;
+		HandleAxis(*this, *state_, delta, PinchScale, 1.0f);
+		return;
+	}
+
+	HandleAxis(*this, *state_, delta, PinchScale, dist / initialDistance_);
+}
+
+}
+
+#endif
+