Fabio/aves_panorama
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add croppedArea

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Mark Hu 2021-01-04 20:15:33 +08:00
parent bfe10f206a
commit f9b664646d
1 changed files with 21 additions and 7 deletions
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28
lib/panorama.dart
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@ -37,6 +37,9 @@ class Panorama extends StatefulWidget {
this.lonSegments = 64,
this.interactive = true,
this.sensorControl = SensorControl.None,
this.croppedArea = const Rect.fromLTWH(0.0, 0.0, 1.0, 1.0),
this.croppedFullWidth = 1.0,
this.croppedFullHeight = 1.0,
this.onViewChanged,
this.child,
this.hotspots,
@ -90,6 +93,15 @@ class Panorama extends StatefulWidget {
/// Control the panorama with motion sensors.
final SensorControl sensorControl;
/// Area of the image was cropped from the full sized photo sphere.
final Rect croppedArea;
/// Original full width from which the image was cropped.
final double croppedFullWidth;
/// Original full height from which the image was cropped.
final double croppedFullHeight;
/// It is called when the view direction has changed, sending the new longitude and latitude values back.
final Function(double longitude, double latitude, double tilt) onViewChanged;
@ -267,7 +279,7 @@ class _PanoramaState extends State<Panorama> with SingleTickerProviderStateMixin
scene.camera.position.setFrom(Vector3(0, 0, 0.1));
if (widget.child != null) {
_loadTexture(widget.child.image);
final Mesh mesh = generateSphereMesh(radius: _radius, latSegments: widget.latSegments, lonSegments: widget.lonSegments);
final Mesh mesh = generateSphereMesh(radius: _radius, latSegments: widget.latSegments, lonSegments: widget.lonSegments, croppedArea: widget.croppedArea, croppedFullWidth: widget.croppedFullWidth, croppedFullHeight: widget.croppedFullHeight);
surface = Object(name: 'surface', mesh: mesh, backfaceCulling: false);
scene.world.add(surface);
WidgetsBinding.instance.addPostFrameCallback((_) => _updateView());
@ -346,8 +358,8 @@ class _PanoramaState extends State<Panorama> with SingleTickerProviderStateMixin
void didUpdateWidget(Panorama oldWidget) {
super.didUpdateWidget(oldWidget);
if (surface == null) return;
if (widget.latSegments != oldWidget.latSegments || widget.lonSegments != oldWidget.lonSegments) {
surface.mesh = generateSphereMesh(radius: _radius, latSegments: widget.latSegments, lonSegments: widget.lonSegments, texture: surface.mesh.texture);
if (widget.latSegments != oldWidget.latSegments || widget.lonSegments != oldWidget.lonSegments || widget.croppedArea != oldWidget.croppedArea || widget.croppedFullWidth != oldWidget.croppedFullWidth || widget.croppedFullHeight != oldWidget.croppedFullHeight) {
surface.mesh = generateSphereMesh(radius: _radius, latSegments: widget.latSegments, lonSegments: widget.lonSegments, croppedArea: widget.croppedArea, croppedFullWidth: widget.croppedFullWidth, croppedFullHeight: widget.croppedFullHeight);
}
if (widget.child?.image != oldWidget.child?.image) {
_loadTexture(widget.child?.image);
@ -413,7 +425,7 @@ class Hotspot {
Widget widget;
}
Mesh generateSphereMesh({num radius = 1.0, int latSegments = 16, int lonSegments = 16, ui.Image texture}) {
Mesh generateSphereMesh({num radius = 1.0, int latSegments = 16, int lonSegments = 16, ui.Image texture, Rect croppedArea = const Rect.fromLTWH(0.0, 0.0, 1.0, 1.0), double croppedFullWidth = 1.0, double croppedFullHeight = 1.0}) {
int count = (latSegments + 1) * (lonSegments + 1);
List<Vector3> vertices = List<Vector3>(count);
List<Offset> texcoords = List<Offset>(count);
@ -421,13 +433,15 @@ Mesh generateSphereMesh({num radius = 1.0, int latSegments = 16, int lonSegments
int i = 0;
for (int y = 0; y <= latSegments; ++y) {
final double v = y / latSegments;
final double tv = y / latSegments;
final double v = (croppedArea.top + croppedArea.height * tv) / croppedFullHeight;
final double sv = math.sin(v * math.pi);
final double cv = math.cos(v * math.pi);
for (int x = 0; x <= lonSegments; ++x) {
final double u = x / lonSegments;
final double tu = x / lonSegments;
final double u = (croppedArea.left + croppedArea.width * tu) / croppedFullWidth;
vertices[i] = Vector3(radius * math.cos(u * math.pi * 2.0) * sv, radius * cv, radius * math.sin(u * math.pi * 2.0) * sv);
texcoords[i] = Offset(u, 1.0 - v);
texcoords[i] = Offset(tu, 1.0 - tv);
i++;
}
}