Struct TreeRenderState 

pub struct TreeRenderState {
    pub pan_x: f32,
    pub pan_y: f32,
    pub target_pan_x: f32,
    pub target_pan_y: f32,
    pub prev_cursor: TreeCoord,
    pub initialized: bool,
    pub drag_last: Option<(u16, u16)>,
}

Render-side state for the upgrade tree modal. Holds the smoothed camera pan (so panning eases instead of snapping), the active drag tracker, and a snapshot of the last-seen cursor for cursor-change detection.

All f32 because the tween needs sub-cell precision — the final pan_x / pan_y are rounded back to integer cells in the renderer.

Fields

pan_x: f32

Current rendered pan (canvas-cell coords). Eased toward target_* each frame; pan reads use .round() as i32.

pan_y: f32

target_pan_x: f32

Where the camera is heading. Set to the cursor’s centered position whenever the cursor changes; modified directly by drag.

target_pan_y: f32

prev_cursor: TreeCoord

Previously-rendered cursor — drives cursor-change detection (cursor change resets target_pan_* to its centered position).

initialized: bool

false before the first frame in the current modal session; the renderer snaps pan_* to target_* on that frame instead of tweening. Reset to false on every modal close so the camera doesn’t tween from a stale position on reopen.

drag_last: Option<(u16, u16)>

Last mouse cell observed while the left button was held. While Some, MouseMoved events apply the (cell-delta) directly to pan_* AND target_pan_* so the dragged position sticks after release (the tween doesn’t pull back to cursor).

Trait Implementations

impl Clone for TreeRenderState

fn clone(&self) -> TreeRenderState

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TreeRenderState

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for TreeRenderState

fn default() -> Self

Returns the “default value” for a type.

impl Copy for TreeRenderState