Duy Tran Khanh
b9d6e14015
This commit fixes #570 Also fix gyro factor to match 1:1 ratio like the comment
72 lines
2.4 KiB
Objective-C
72 lines
2.4 KiB
Objective-C
#import <CoreMotion/CoreMotion.h>
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#import <UIKit/UIKit.h>
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#import "GyroInput.h"
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#import "../SurfaceViewController.h"
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#import "../utils.h"
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@implementation GyroInput
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static CGFloat lastXValue, lastYValue, lastFrameTime;
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static CGFloat gyroSensitivity;
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static int gyroInvertX;
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static BOOL gyroInvertAxis, gyroSwapAxis;
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static CMMotionManager* cmInstance;
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+ (void)updateOrientation {
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UIInterfaceOrientation orientation = UIApplication.sharedApplication.windows[0].windowScene.interfaceOrientation;
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gyroInvertAxis =
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orientation==UIInterfaceOrientationPortraitUpsideDown ||
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orientation==UIInterfaceOrientationLandscapeLeft;
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gyroSwapAxis = UIInterfaceOrientationIsPortrait(orientation);
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// FIXME: camera jumps upon rotating screen
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}
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+ (void)updateSensitivity:(int)sensitivity invertXAxis:(BOOL)invertX {
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if (cmInstance == nil) {
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cmInstance = [[CMMotionManager alloc] init];
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}
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gyroSensitivity = sensitivity / 100.0;
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if (sensitivity > 0) {
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gyroInvertX = invertX ? 1 : -1;
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[self updateOrientation];
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[cmInstance startDeviceMotionUpdates];
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} else {
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lastXValue = lastYValue = lastFrameTime = 0;
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[cmInstance stopDeviceMotionUpdates];
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}
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}
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+ (void)tick {
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if (!isGrabbing || gyroSensitivity == 0) {
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lastFrameTime = 0;
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return;
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}
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// Compute delta since last tick time
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CGFloat frameTime = CACurrentMediaTime();
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CGFloat factor = gyroSensitivity;
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if (lastFrameTime != 0) {
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CGFloat deltaTimeScale = (frameTime - lastFrameTime) / (1.0/60.0); // Scale of 1 = 60Hz
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factor *= deltaTimeScale;
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}
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// 100% sensitivity -> 1:1 ratio between real world and ingame camera
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if (gyroInvertAxis) {
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factor *= -1;
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}
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if (gyroSwapAxis) {
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lastXValue = cmInstance.deviceMotion.rotationRate.y / (M_PI*90) * windowWidth * factor * gyroInvertX;
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lastYValue = -cmInstance.deviceMotion.rotationRate.x / (M_PI*180) * windowHeight * factor;
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} else {
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lastXValue = cmInstance.deviceMotion.rotationRate.x / (M_PI*180) * windowWidth * factor * gyroInvertX;
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lastYValue = cmInstance.deviceMotion.rotationRate.y / (M_PI*90) * windowHeight * factor;
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}
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SurfaceViewController *vc = (id)(currentWindow().rootViewController);
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[vc sendTouchPoint:CGPointMake(lastXValue, lastYValue) withEvent:ACTION_MOVE_MOTION];
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lastFrameTime = frameTime;
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}
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@end
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