golang 正坐标转换为反坐标

// C 为两个矩阵相交区域

// 矩阵
type Rect struct {
    x0 int // 左定点X
    y0 int // 左顶点Y
    x1 int // 右底点X
    y1 int // 右底点Y
}

func NodeChangeRect(b, c *Rect) (x0, y0, x1, y1 float32) {
    // 对象宽高
    b_width := b.x1 - b.x0
    b_height := b.y1 - b.y0
    c_width := c.x1 - c.x0
    c_height := c.y1 - c.y0
    // 计算
    x0 = float32(c.x0-b.x0) / float32(b_width)
    y0 = float32(b_height-((c.y0-b.y0)+c_height)) / float32(b_height)
    x1 = float32(c.x0-b.x0+c_width) / float32(b_width)
    y1 = float32(b_height-(c.y0-b.y0)) / float32(b_height)
    // 返回
    return
}

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