💥 几何库优化

utils/geometry/geometry.go

@@ -0,0 +1,118 @@
+package geometry
+
+import (
+	"github.com/kercylan98/minotaur/utils/generic"
+	"math"
+)
+
+// Direction 方向
+type Direction uint8
+
+const (
+	DirectionUnknown = Direction(iota) // 未知
+	DirectionUp                        // 上方
+	DirectionDown                      // 下方
+	DirectionLeft                      // 左方
+	DirectionRight                     // 右方
+)
+
+var (
+	Directions = []Direction{DirectionUp, DirectionDown, DirectionLeft, DirectionRight} // 上下左右四个方向的数组
+)
+
+// GetDirectionNextWithCoordinate 获取特定方向上的下一个坐标
+func GetDirectionNextWithCoordinate[V generic.Number](direction Direction, x, y V) (nx, ny V) {
+	switch direction {
+	case DirectionUp:
+		nx, ny = x, y-1
+	case DirectionDown:
+		nx, ny = x, y+1
+	case DirectionLeft:
+		nx, ny = x-1, y
+	case DirectionRight:
+		nx, ny = x+1, y
+	default:
+		panic("unexplained direction")
+	}
+	return
+}
+
+// GetDirectionNextWithCoordinateArray 获取特定方向上的下一个坐标
+func GetDirectionNextWithCoordinateArray[V generic.Number](direction Direction, point Point[V]) Point[V] {
+	x, y := point.GetXY()
+	switch direction {
+	case DirectionUp:
+		return NewPoint(x, y-1)
+	case DirectionDown:
+		return NewPoint(x, y+1)
+	case DirectionLeft:
+		return NewPoint(x-1, y)
+	case DirectionRight:
+		return NewPoint(x+1, y)
+	default:
+		panic("unexplained direction")
+	}
+}
+
+// GetDirectionNextWithPos 获取位置在特定宽度和特定方向上的下一个位置
+//   - 需要注意的是，在左右方向时，当下一个位置不在游戏区域内时，将会返回上一行的末位置或下一行的首位置
+func GetDirectionNextWithPos[V generic.Number](direction Direction, width, pos V) V {
+	switch direction {
+	case DirectionUp:
+		return pos - width
+	case DirectionDown:
+		return pos + width
+	case DirectionLeft:
+		return pos - 1
+	case DirectionRight:
+		return pos + 1
+	default:
+		panic("unexplained direction")
+	}
+}
+
+// CalcDirection 计算点2位于点1的方向
+func CalcDirection[V generic.Number](x1, y1, x2, y2 V) Direction {
+	var oneEighty = 180
+	var fortyFive = 45
+	var oneThirtyFive = 135
+	var twoTwentyFive = 225
+	var threeFifteen = 315
+	var end = 360
+	var start = 0
+	angle := CalcAngle(x1, y1, x2, y2) + V(oneEighty)
+	if angle > V(oneThirtyFive) && angle <= V(twoTwentyFive) {
+		return DirectionRight
+	} else if (angle > V(threeFifteen) && angle <= V(end)) || (angle >= V(start) && angle <= V(fortyFive)) {
+		return DirectionLeft
+	} else if angle > V(twoTwentyFive) && angle <= V(threeFifteen) {
+		return DirectionUp
+	} else if angle > V(fortyFive) && angle <= V(oneThirtyFive) {
+		return DirectionDown
+	}
+	return DirectionUnknown
+}
+
+// CalcDistance 计算两点之间的距离
+func CalcDistance[V generic.Number](x1, y1, x2, y2 V) V {
+	return V(math.Sqrt(math.Pow(float64(x2-x1), 2) + math.Pow(float64(y2-y1), 2)))
+}
+
+// CalcAngle 计算点2位于点1之间的角度
+func CalcAngle[V generic.Number](x1, y1, x2, y2 V) V {
+	return V(math.Atan2(float64(y2-y1), float64(x2-x1)) * 180 / math.Pi)
+}
+
+// CalculateNewCoordinate 根据给定的x、y坐标、角度和距离计算新的坐标
+func CalculateNewCoordinate[V generic.Number](x, y, angle, distance V) (newX, newY V) {
+	// 将角度转换为弧度
+	var pi = math.Pi
+	var dividend = 180.0
+	radians := angle * V(pi) / V(dividend)
+
+	// 计算新的坐标
+	newX = x + distance*V(math.Cos(float64(radians)))
+	newY = y + distance*V(math.Sin(float64(radians)))
+
+	return newX, newY
+}