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To specify the position of something on a flat surface we need to give two numbers: the horizontal distance from the origin and the vertical distance.
As can be see in the figure above, by default, the origin of the Java graphics co-ordinate system is in the top-left corner of the object being drawn. This means that the position specified when both numbers are zero is the top-left corner of the graphics context (usually this is the same as the top-left corner of the component). By convention we often refer to the horizontal position as the ‘x co-ordinate' and the vertical position as the ‘y co-ordinate'. The positions are measured in pixels by default. An implication of measuring in pixels is that a program may produce a display which fits easily on the screen on one system, but is too big on another. Ideally a program should be able to scale its display to match the current screen, or provide scroll bars or some other facility for managing large displays.
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