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small things

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This commit is contained in:
Ryan Oldenburg 2021-11-23 03:32:11 -06:00
parent a8518c8218
commit ebac3e1f24
1 changed files with 18 additions and 22 deletions
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40
src/pixie/paints.nim
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@ -45,9 +45,7 @@ proc newPaint*(paint: Paint): Paint {.raises: [].} =
result.gradientHandlePositions = paint.gradientHandlePositions result.gradientHandlePositions = paint.gradientHandlePositions
result.gradientStops = paint.gradientStops result.gradientStops = paint.gradientStops
converter parseSomePaint*( converter parseSomePaint*(paint: SomePaint): Paint {.inline.} =
paint: SomePaint
): Paint {.inline.} =
## Given SomePaint, parse it in different ways. ## Given SomePaint, parse it in different ways.
when type(paint) is string: when type(paint) is string:
result = newPaint(pkSolid) result = newPaint(pkSolid)
@ -67,19 +65,10 @@ converter parseSomePaint*(
proc colorStop*(color: Color, position: float32): ColorStop = proc colorStop*(color: Color, position: float32): ColorStop =
ColorStop(color: color, position: position) ColorStop(color: color, position: position)
proc toLineSpace(at, to, point: Vec2): float32 {.inline.} = proc gradientPut(image: Image, paint: Paint, x, y: int, t: float32) =
## Convert position on to where it would fall on a line between at and to.
let
d = to - at
det = d.x * d.x + d.y * d.y
(d.y * (point.y - at.y) + d.x * (point.x - at.x)) / det
proc gradientPut(
image: Image, paint: Paint, x, y: int, t: float32, stops: seq[ColorStop]
) =
## Put an gradient color based on `t` - where are we related to a line. ## Put an gradient color based on `t` - where are we related to a line.
var index = -1 var index = -1
for i, stop in stops: for i, stop in paint.gradientStops:
if stop.position < t: if stop.position < t:
index = i index = i
if stop.position > t: if stop.position > t:
@ -87,14 +76,14 @@ proc gradientPut(
var color: Color var color: Color
if index == -1: if index == -1:
# first stop solid # first stop solid
color = stops[0].color color = paint.gradientStops[0].color
elif index + 1 >= stops.len: elif index + 1 >= paint.gradientStops.len:
# last stop solid # last stop solid
color = stops[index].color color = paint.gradientStops[index].color
else: else:
let let
gs1 = stops[index] gs1 = paint.gradientStops[index]
gs2 = stops[index + 1] gs2 = paint.gradientStops[index + 1]
color = mix( color = mix(
gs1.color, gs1.color,
gs2.color, gs2.color,
@ -115,6 +104,13 @@ proc fillGradientLinear(image: Image, paint: Paint) =
if paint.opacity == 0: if paint.opacity == 0:
return return
proc toLineSpace(at, to, point: Vec2): float32 {.inline.} =
## Convert position on to where it would fall on a line between at and to.
let
d = to - at
det = d.x * d.x + d.y * d.y
(d.y * (point.y - at.y) + d.x * (point.x - at.x)) / det
let let
at = paint.gradientHandlePositions[0] at = paint.gradientHandlePositions[0]
to = paint.gradientHandlePositions[1] to = paint.gradientHandlePositions[1]
@ -123,7 +119,7 @@ proc fillGradientLinear(image: Image, paint: Paint) =
let let
xy = vec2(x.float32, y.float32) xy = vec2(x.float32, y.float32)
t = toLineSpace(at, to, xy) t = toLineSpace(at, to, xy)
image.gradientPut(paint, x, y, t, paint.gradientStops) image.gradientPut(paint, x, y, t)
proc fillGradientRadial(image: Image, paint: Paint) = proc fillGradientRadial(image: Image, paint: Paint) =
## Fills a radial gradient. ## Fills a radial gradient.
@ -154,7 +150,7 @@ proc fillGradientRadial(image: Image, paint: Paint) =
let let
xy = vec2(x.float32, y.float32) xy = vec2(x.float32, y.float32)
t = (mat * xy).length() t = (mat * xy).length()
image.gradientPut(paint, x, y, t, paint.gradientStops) image.gradientPut(paint, x, y, t)
proc fillGradientAngular(image: Image, paint: Paint) = proc fillGradientAngular(image: Image, paint: Paint) =
## Fills an angular gradient. ## Fills an angular gradient.
@ -179,7 +175,7 @@ proc fillGradientAngular(image: Image, paint: Paint) =
xy = vec2(x.float32, y.float32) xy = vec2(x.float32, y.float32)
angle = normalize(xy - center).angle() angle = normalize(xy - center).angle()
t = (angle + gradientAngle + PI / 2).fixAngle() / 2 / PI + 0.5 t = (angle + gradientAngle + PI / 2).fixAngle() / 2 / PI + 0.5
image.gradientPut(paint, x, y, t, paint.gradientStops) image.gradientPut(paint, x, y, t)
proc fillGradient*(image: Image, paint: Paint) {.raises: [PixieError].} = proc fillGradient*(image: Image, paint: Paint) {.raises: [PixieError].} =
## Fills with the Paint gradient. ## Fills with the Paint gradient.