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added user settings to control river width variability and bank detail

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Grimsace
2026-02-18 14:33:09 -06:00
parent a6d9946b50
commit 6227ecb3fd
3 changed files with 79 additions and 43 deletions
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water.go
+12 -7
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@@ -190,7 +190,7 @@ type River struct {
}
// GenerateRivers creates rivers on the map.
func GenerateRivers(width, height, numRivers int, minWidth, maxWidth, curvyness float64, inputImage image.Image, lakes [][]image.Point, seed int64, heightmap image.Image) (image.Image, []image.Point) {
func GenerateRivers(width, height, numRivers int, minWidth, maxWidth, curvyness float64, inputImage image.Image, lakes [][]image.Point, seed int64, heightmap image.Image, riverWidthVariability, riverEdgeRoughness float64) (image.Image, []image.Point) {
if numRivers == 0 {
return inputImage, nil
}
@@ -267,7 +267,7 @@ func GenerateRivers(width, height, numRivers int, minWidth, maxWidth, curvyness
radius := riverWidthPx / 2.0
for _, p := range path {
drawCircle(canvas, p, radius, color.RGBA{R: 0, G: 0, B: 255, A: 255}, &allRiverPixels, isWater, heightmap)
drawCircle(canvas, p, radius, color.RGBA{R: 0, G: 0, B: 255, A: 255}, &allRiverPixels, isWater, heightmap, riverWidthVariability, riverEdgeRoughness)
}
r.Points = path
}
@@ -410,14 +410,19 @@ func getPointOnEdge(width, height, edge int, randSrc *rand.Rand) image.Point {
// drawCircle draws a circle on the image and adds its pixels to the given slice.
// The outer edges are roughened using dual sin waves for natural-looking banks.
func drawCircle(img *image.RGBA, center image.Point, radius float64, c color.Color, pixels *[]image.Point, isWater map[image.Point]bool, heightmap image.Image) {
// riverWidthVariability controls the amplitude of width changes (0-100%).
// riverEdgeRoughness controls the detail level of the edge roughness (0-100%).
func drawCircle(img *image.RGBA, center image.Point, radius float64, c color.Color, pixels *[]image.Point, isWater map[image.Point]bool, heightmap image.Image, riverWidthVariability, riverEdgeRoughness float64) {
bounds := img.Bounds()
// Calculate dual sin wave amplitudes for outer edge roughening
// Large amplitude represents major variations in river width
// Small amplitude is 1/4 of large for subtle details
largeAmplitude := radius * 0.25
smallAmplitude := largeAmplitude / 4.0
// Large amplitude represents major variations in river width (controlled by riverWidthVariability)
// At 0%, no width variation; at 100%, amplitude is 50% of radius
largeAmplitude := (radius * 0.5) * (riverWidthVariability / 100.0)
// Small amplitude is controlled by riverEdgeRoughness
// At 0%, no detail; at 100%, detail amplitude equals large amplitude
smallAmplitude := largeAmplitude * (riverEdgeRoughness / 100.0)
for y := int(math.Floor(float64(center.Y) - radius)); y <= int(math.Ceil(float64(center.Y)+radius)); y++ {
for x := int(math.Floor(float64(center.X) - radius)); x <= int(math.Ceil(float64(center.X)+radius)); x++ {