X and Y Coordinates
An X coordinate and a Y coordinate indicate the location of a point along the X-axis (horizontal) and Y-axis (vertical). X and Y coordinates are written in parenthesis: (9, 30). The first value is the X coordinate and the second value is the Y coordinate.
In design software, X and Y coordinates represent a layer’s location on the canvas. If a layer is inside a frame, the coordinates represent its position within the frame.
When a layer is moved around on the canvas, its coordinates automatically update to reflect its position. Alternatively, new coordinate values can be entered, shifting the layer to a new location on the canvas.
In design software, the origin, or point where the X-axis and Y-axis intersect, is at the top-left corner of the canvas or frame. Thus, a layer at the top-left corner of a frame has the coordinates (0,0). As the layer is moved right, the value of its X coordinate increases. As the layer is moved down, the value of its Y coordinate increases.
X and Y coordinates represent the location of a single point, but a layer is generally much larger than a point. Therefore, design software assigns a reference point, which is the exact point on the layer that correlates to its coordinates. The reference point is typically located at the top-left corner of the layer’s bounds. However, in some software, it’s possible to shift the reference point.
Because design software assigns X and Y coordinates for every layer, designers can precisely position all layers in the design.
For example, if a button should appear in the same position across multiple website pages, a designer can check the X and Y coordinates of the button to ensure that they are the same on every frame.
Figma, a prototyping tool and graphics editor, has more information on X and Y coordinations including alignment, rotation, and postiion.