PannableCanvasState¶

@Stable



class PannableCanvasState

Mutable pan/zoom state for a PannableCanvas - create via rememberPannableCanvasState to survive recomposition.

Constructors¶

PannableCanvasState¶

constructor()

Types¶

`Companion`¶

object Companion

Properties¶

panX¶

var panX: Int

panY¶

var panY: Int

zoom¶

var zoom: Float

Current zoom factor, clamped to MIN_ZOOM/MAX_ZOOM - 1f is unzoomed. Set via zoomBy, not directly, so a change always keeps zoomBy's own cursor-anchored point stationary rather than silently re-centering the view.

Functions¶

zoomBy¶

fun zoomBy(
    delta: Float, 
    cursorScreenX: Int, 
    cursorScreenY: Int
)

Adjusts zoom by delta (a scroll wheel notch, typically), keeping whatever content point currently sits under (cursorScreenX,cursorScreenY) - absolute screen coordinates, e.g. a net.kernelpanicsoft.archie.gui.modifiers.input.ScrollEvent's own mouseX/mouseY - visually stationary, the same "zoom toward the cursor" behavior a map or image viewer uses, rather than always zooming around the canvas's own top-left corner.

PannableCanvasState¶

Constructors¶