图形的变换源于现实生活中的物体运动、变化,它是对物体运动、变化的数学抽象.具体的图形变换形式有平移变换、轴对称变换、旋转变换和位似变换,这些变换涉及图形的形状、大小、位置、方向四个方面.其中,平移变换不改变图形的形状、大小、方向,只是改变了图形的位置,而轴对称变换、旋转变换(包括中心对称变换)也不改变图形的形状、大小,但改变了图形的方向和位置,位似变换只 The transformation of graphics comes from the movement and change of objects in real life, which is a mathematical abstraction of the movement and change of objects.The specific forms of transformation include translation, axisymmetric transformation, rotation transformation and bit transformation, Shape, size, position, direction, etc. Among them, the translation does not change the shape of the graphics, size, direction, just change the position of the graphics, and axisymmetric transform, rotation transform (including centrosymmetric transform) does not change the graphics Shape, size, but changed the direction and location of the graphics, bit-like transform only