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Allow pinch zoom in 2D mode

This commit is contained in:
Patrick Walton 2019-02-12 15:00:33 -08:00
parent d7f6d9eb3d
commit 2eccdba360
1 changed files with 13 additions and 4 deletions
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17
demo/src/main.rs
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@ -47,6 +47,8 @@ const MAIN_FRAMEBUFFER_HEIGHT: u32 = 800;
const MOUSELOOK_ROTATION_SPEED: f32 = 0.007;
const CAMERA_VELOCITY: f32 = 25.0;
const CAMERA_SCALE_SPEED_2D: f32 = 2.0;
const BACKGROUND_COLOR: ColorU = ColorU { r: 32, g: 32, b: 32, a: 255 };
const APPROX_FONT_SIZE: f32 = 16.0;
@ -182,8 +184,10 @@ impl DemoApp {
RenderTransform::Perspective(Perspective::new(&transform, &drawable_size))
}
Camera::TwoD { ref position } => {
Camera::TwoD { ref position, scale } => {
let mut transform = Transform2DF32::from_rotation(self.ui.rotation());
transform =
transform.post_mul(&Transform2DF32::from_scale(&Point2DF32::splat(scale)));
transform = transform.post_mul(&Transform2DF32::from_translation(position));
RenderTransform::Transform2D(transform)
}
@ -251,6 +255,11 @@ impl DemoApp {
ui_event = UIEvent::MouseDragged { absolute_position, relative_position };
self.dirty = true;
}
Event::MultiGesture { d_dist, .. } => {
if let Camera::TwoD { ref mut scale, .. } = self.camera {
*scale *= 1.0 + d_dist * CAMERA_SCALE_SPEED_2D;
}
}
Event::KeyDown { keycode: Some(Keycode::W), .. } => {
if let Camera::ThreeD { ref mut velocity, .. } = self.camera {
velocity.set_z(-CAMERA_VELOCITY);
@ -354,7 +363,7 @@ impl DemoApp {
self.mouselook_enabled = !self.mouselook_enabled;
}
UIEvent::MouseDragged { relative_position, .. } => {
if let Camera::TwoD { ref mut position } = self.camera {
if let Camera::TwoD { ref mut position, .. } = self.camera {
*position = *position + relative_position.to_f32();
}
}
@ -545,13 +554,13 @@ fn update_drawable_size(window: &Window, scene_thread_proxy: &SceneThreadProxy)
}
enum Camera {
TwoD { position: Point2DF32 },
TwoD { position: Point2DF32, scale: f32 },
ThreeD { position: Point3DF32, velocity: Point3DF32, yaw: f32, pitch: f32 },
}
impl Camera {
fn two_d() -> Camera {
Camera::TwoD { position: Point2DF32::new(0.0, 0.0) }
Camera::TwoD { position: Point2DF32::new(0.0, 0.0), scale: 1.0 }
}
fn three_d() -> Camera {