process-down.md

Process Down

The purpose of the process phases is to pre-compute metrics used to prune the tree during rendering and hit testing. The process down phase is focused on members that are altered by ancestors.

State

The following state is used as input to the process down phase.

export interface IElementState {
    //range: [0.0, 1.0]
    opacity: number;
    visible: boolean;
    //visual offset from parent
    offset: IPoint;
    size: ISize;
    transform: Float32Array;
    //origin of transform in relative coordinate space ([0.0,1.0], [0.0,1.0])
    transformOrigin: IPoint;
}

Composite

During the process down phase, the following elements in the composite object are calculated.

export interface IElementComposite {
    opacity: number;
    visible: boolean;
    transform: Float32Array;
    // others
}