computeBoundingRectangle 计算外接矩形

computeBoundingRectangle

类型: MethodDeclaration

所属类: ImageElement

定义位置: ui.ts

描述

计算外接矩形

返回值:外接矩形左上和右下两点位置[x1, y1, x2, y2]

返回值

类型: Float64Array

外接矩形左上和右下两点位置[x1, y1, x2, y2]

源代码

位置: 第 2038 行

private computeBoundingRectangle(): Float64Array {
    const matrix = this.matrix
    const L = this.x
    const T = this.y
    const R = L + this.width
    const B = T + this.height
    const a = matrix[0]
    const b = matrix[1]
    const c = matrix[3]
    const d = matrix[4]
    const e = matrix[6]
    const f = matrix[7]
    const x1 = a * L + c * T + e
    const y1 = b * L + d * T + f
    const x2 = a * L + c * B + e
    const y2 = b * L + d * B + f
    const x3 = a * R + c * B + e
    const y3 = b * R + d * B + f
    const x4 = a * R + c * T + e
    const y4 = b * R + d * T + f
    const vertices = ImageElement.sharedFloat64Array
    vertices[0] = Math.min(x1, x2, x3, x4)
    vertices[1] = Math.min(y1, y2, y3, y4)
    vertices[2] = Math.max(x1, x2, x3, x4)
    vertices[3] = Math.max(y1, y2, y3, y4)
    return vertices
  }

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文档生成时间：2025/7/21 20:53:39