Relintai/pandemonium_engine_easy_charts
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refactor spline

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This commit is contained in:
fenix-hub 2023-01-21 14:29:45 +01:00
parent 876f78598d
commit 558e978723
1 changed files with 7 additions and 24 deletions
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31
addons/easy_charts/control_charts/LineChart/line_chart.gd
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@ -10,10 +10,6 @@ func _draw_line(from: Point, to: Point, function_index: int) -> void:
true
)
# Draw a B-Spline using the Catmull-Rom method
# Also, add a fake starting and ending point to complete the beginning and the end of the spline
# @points = a list of at least 4 coordinates
# @tension = some value greater than 0, defaulting to 1
func _draw_spline(points: Array, function: int, density: float = 10.0, tension: float = 1) -> void:
var spline_points: Array = []
@ -25,28 +21,15 @@ func _draw_spline(points: Array, function: int, density: float = 10.0, tension:
augmented.append(pf)
for p in range(1, augmented.size() - 2, 1) : #(inclusive)
var p0: Vector2 = augmented[p - 1].position
# v1 = p1 = augmented[p]
var p1: Vector2 = augmented[p].position
var v1: Vector2 = p1
# v2 = p2 = augmented[p+1]
var p2: Vector2 = augmented[p + 1].position
var v2: Vector2 = p2
var p3: Vector2 = augmented[p + 2].position
var s: int = 2.0 * tension
var dv1: Vector2 = (p2 - p0) / s
var dv2: Vector2 = (p3 - p1) / s
for f in range(0, density + 1, 1):
var t: float = f / density
var c0: float = (2.0 * pow(t, 3)) - (3.0 * pow(t,2)) + 1.0
var c1: float = pow(t, 3) - (2.0 * pow(t, 2)) + t
var c2: float = (-2.0 * pow(t, 3)) + (3.0 * pow(t, 2))
var c3: float = pow(t, 3) - pow(t, 2)
var crp: Vector2 = (c0 * v1 + c1 * dv1 + c2 * v2 + c3 * dv2)
# draw_circle(crp, 4, Color.magenta)
spline_points.append(crp)
spline_points.append(
augmented[p].position.cubic_interpolate(
augmented[p + 1].position,
augmented[p - 1].position,
augmented[p + 2].position,
f / density)
)
for i in range(1, spline_points.size()):
draw_line(spline_points[i-1], spline_points[i], chart_properties.get_function_color(function), chart_properties.line_width, true)