106 lines
2.0 KiB
Go
106 lines
2.0 KiB
Go
package d2helper
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import "math"
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func MinInt(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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func MaxInt(a, b int) int {
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if a > b {
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return a
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}
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return b
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}
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// Min returns the lower of two values
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func Min(a, b uint32) uint32 {
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if a < b {
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return a
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}
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return b
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}
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// Max returns the higher of two values
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func Max(a, b uint32) uint32 {
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if a > b {
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return a
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}
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return b
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}
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// MaxInt32 returns the higher of two values
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func MaxInt32(a, b int32) int32 {
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if a > b {
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return a
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}
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return b
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}
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func NextPow2(x int32) int32 {
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result := int32(1)
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for result < x {
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result *= 2
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}
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return result
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}
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func AbsInt32(a int32) int32 {
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if a < 0 {
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return -a
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}
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return a
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}
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// MinInt32 returns the higher of two values
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func MinInt32(a, b int32) int32 {
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if a < b {
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return a
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}
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return b
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}
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// BytesToInt32 converts 4 bytes to int32
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func BytesToInt32(b []byte) int32 {
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// equivalnt of return int32(binary.LittleEndian.Uint32(b))
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return int32(uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24)
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}
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// IsoToScreen converts isometric coordinates to screenspace coordinates
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func IsoToScreen(isoX, isoY, modX, modY float64) (float64, float64) {
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screenX := (isoX - isoY) * 80
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screenY := (isoX + isoY) * 40
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return screenX + modX, screenY + modY
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}
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// ScreenToIso converts screenspace coordinates to isometric coordinates
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func ScreenToIso(sx, sy float64) (float64, float64) {
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x := (sx/80 + sy/40) / 2
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y := (sy/40 - (sx / 80)) / 2
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return x, y
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}
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// GetAngleBetween returns the angle between two points. 0deg is facing to the right.
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func GetAngleBetween(p1X, p1Y, p2X, p2Y float64) int {
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deltaY := p1Y - p2Y
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deltaX := p2X - p1X
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result := math.Atan2(deltaY, deltaX) * (180 / math.Pi)
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iResult := int(result)
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for iResult < 0 {
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iResult += 360
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}
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for iResult >= 360 {
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iResult -= 360
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}
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return iResult
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}
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// AlmostEqual returns true if two values are within threshold from each other
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func AlmostEqual(a, b, threshold float64) bool {
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return math.Abs(a-b) <= threshold
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}
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