tools/util/image/basic.go

package image

type Basic struct {
	Cache
	Path       string
	File       string
	Background string
	ViewPoint  *Point
	ViewSize   *Size
	Angle      float64
}

// SetAngle 设置旋转角度
func (i *Basic) SetAngle(angle float64) {
	i.Angle = angle
}

// SetSize 设置目标尺寸
func (i *Basic) SetSize(width, height uint) {
	i.ViewSize = NewSize(width, height)
}

// SetPoint 设置图片的x、y 坐标
func (i *Basic) SetPoint(x, y float64) {
	i.ViewPoint = NewPoint(x, y)
}

// SetFile 设置处理的图片
func (i *Basic) SetFile(file string) {
	i.File = file
}

// SetBackground 设置背景色
func (i *Basic) SetBackground(background string) {
	i.Background = background
}

// Position 计算裁切的x、y及宽高
func (i *Basic) Position(position string, width, height uint, size *Size) (dx, dy int, dWidth, dHeight uint) {
	x := 0
	y := 0
	scale := 1.0

	if width < size.Width {
		scale = CustomScale(width, size.Width)
		width = size.Width
	}
	if height < size.Height {
		scale = CustomScale(height, size.Height)
		height = size.Height
	}
	paddingLeft := width - size.Width
	paddingTop := height - size.Height

	if position == "right" {
		x = int(paddingLeft)
	}
	if position == "center" {
		x = int(paddingLeft / 2)
		y = int(paddingTop / 2)
	}

	if position == "right|center" {
		x = int(paddingLeft)
		y = int(paddingTop / 2)
	}
	if position == "left|center" {
		y = int(paddingTop / 2)
	}
	return x, y, uint(float64(size.Width) * scale), uint(float64(size.Height) * scale)
}