27 lines
639 B
Go
27 lines
639 B
Go
package g2d
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// Direction 方向
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type Direction uint8
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const (
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DirectionUp = Direction(iota) // 上方
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DirectionDown // 下方
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DirectionLeft // 左方
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DirectionRight // 右方
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)
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// CalcDirection 计算点2位于点1的方向
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func CalcDirection(x1, y1, x2, y2 float64) Direction {
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angle := CalcAngle(x1, y1, x2, y2)
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if angle > -45 && angle < 45 {
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return DirectionRight
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} else if angle > 135 && angle < -135 {
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return DirectionLeft
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} else if angle > 45 && angle < 135 {
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return DirectionUp
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} else if angle > -135 && angle < -45 {
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return DirectionDown
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}
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return 0
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}
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