olemd/tilt-shift-camera
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Fix portrait orientation and reduce gesture sensitivity

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- Rotate texture coordinates 90° for portrait mode display
  (camera sensors are landscape-oriented by default)
- Add sensitivity dampening constants for all gesture types:
  - Position drag: 0.3x
  - Rotation: 0.4x
  - Size pinch: 0.5x
  - Zoom pinch: 0.6x
- Track accumulated drag for smoother position changes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Ole-Morten Duesund 2026-01-28 15:32:31 +01:00
commit 3bbf4f9d14
2 changed files with 26 additions and 9 deletions
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11
app/src/main/java/no/naiv/tiltshift/effect/TiltShiftRenderer.kt
View file

@ -44,12 +44,13 @@ class TiltShiftRenderer(
1f, 1f // Top right
)
// Texture coordinates (flip Y for camera)
// Texture coordinates rotated 90° for portrait mode
// (Camera sensors are landscape-oriented, we rotate to portrait)
private val texCoords = floatArrayOf(
0f, 1f, // Bottom left
1f, 1f, // Bottom right
0f, 0f, // Top left
1f, 0f // Top right
1f, 1f, // Bottom left of screen -> bottom right of texture
1f, 0f, // Bottom right of screen -> top right of texture
0f, 1f, // Top left of screen -> bottom left of texture
0f, 0f // Top right of screen -> top left of texture
)
override fun onSurfaceCreated(gl: GL10?, config: EGLConfig?) {

24
app/src/main/java/no/naiv/tiltshift/ui/TiltShiftOverlay.kt
View file

@ -39,6 +39,12 @@ private enum class GestureType {
PINCH_ZOOM // Pinch in center to zoom camera
}
// Sensitivity factors for gesture controls (lower = less sensitive)
private const val POSITION_SENSITIVITY = 0.3f // Drag to move focus line
private const val ROTATION_SENSITIVITY = 0.4f // Two-finger rotation
private const val SIZE_SENSITIVITY = 0.5f // Pinch to resize blur zone
private const val ZOOM_SENSITIVITY = 0.6f // Pinch to zoom camera
/**
* Overlay that shows tilt-shift effect controls and handles gestures.
*/
@ -53,6 +59,7 @@ fun TiltShiftOverlay(
var initialZoom by remember { mutableFloatStateOf(1f) }
var initialAngle by remember { mutableFloatStateOf(0f) }
var initialSize by remember { mutableFloatStateOf(0.3f) }
var initialPosition by remember { mutableFloatStateOf(0.5f) }
Canvas(
modifier = modifier
@ -66,9 +73,11 @@ fun TiltShiftOverlay(
var previousPointerCount = 1
var accumulatedRotation = 0f
var accumulatedZoom = 1f
var accumulatedDragY = 0f
initialAngle = params.angle
initialSize = params.size
initialPosition = params.position
initialZoom = 1f
do {
@ -101,18 +110,23 @@ fun TiltShiftOverlay(
when (currentGesture) {
GestureType.ROTATE -> {
accumulatedRotation += rotation
// Apply dampening to rotation
accumulatedRotation += rotation * ROTATION_SENSITIVITY
val newAngle = initialAngle + accumulatedRotation
onParamsChange(params.copy(angle = newAngle))
}
GestureType.PINCH_SIZE -> {
accumulatedZoom *= zoom
// Apply dampening to size change
val dampenedZoom = 1f + (zoom - 1f) * SIZE_SENSITIVITY
accumulatedZoom *= dampenedZoom
val newSize = (initialSize * accumulatedZoom)
.coerceIn(BlurParameters.MIN_SIZE, BlurParameters.MAX_SIZE)
onParamsChange(params.copy(size = newSize))
}
GestureType.PINCH_ZOOM -> {
onZoomChange(zoom)
// Apply dampening to camera zoom
val dampenedZoom = 1f + (zoom - 1f) * ZOOM_SENSITIVITY
onZoomChange(dampenedZoom)
}
else -> {}
}
@ -125,8 +139,10 @@ fun TiltShiftOverlay(
}
if (currentGesture == GestureType.DRAG_POSITION) {
// Apply dampening to position drag
val deltaY = (centroid.y - previousCentroid.y) / size.height
val newPosition = (params.position + deltaY).coerceIn(0f, 1f)
accumulatedDragY += deltaY * POSITION_SENSITIVITY
val newPosition = (initialPosition + accumulatedDragY).coerceIn(0f, 1f)
onParamsChange(params.copy(position = newPosition))
}
}