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[rshapes] Fix multisegment Bezier splines. (#3744)

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* [rshapes] Fix multisegment Bezier splines.

It seems to me that these functions are wrong, if you step the index by 1 you move to a control point instead of the next segment.

* Fix example shapes/shapes_splines_drawing for bezier splines.

* Draw circles to fill gaps between bezier segments.
This commit is contained in:
Santiago Pelufo 2024-06-16 05:21:54 -03:00 committed by GitHub
parent 81ff879b04
commit 640eaca8bf
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GPG Key ID: B5690EEEBB952194
2 changed files with 27 additions and 8 deletions
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21
examples/shapes/shapes_splines_drawing.c
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@ -63,7 +63,7 @@ int main(void)
Vector2 *focusedControlPoint = NULL;
// Cubic Bezier control points initialization
ControlPoint control[MAX_SPLINE_POINTS] = { 0 };
ControlPoint control[MAX_SPLINE_POINTS-1] = { 0 };
for (int i = 0; i < pointCount - 1; i++)
{
control[i].start = (Vector2){ points[i].x + 50, points[i].y };
@ -88,6 +88,9 @@ int main(void)
if (IsMouseButtonPressed(MOUSE_RIGHT_BUTTON) && (pointCount < MAX_SPLINE_POINTS))
{
points[pointCount] = GetMousePosition();
int i = pointCount - 1;
control[i].start = (Vector2){ points[i].x + 50, points[i].y };
control[i].end = (Vector2){ points[i + 1].x - 50, points[i + 1].y };
pointCount++;
}
@ -114,7 +117,7 @@ int main(void)
if ((splineTypeActive == SPLINE_BEZIER) && (focusedPoint == -1))
{
// Spline control point focus and selection logic
for (int i = 0; i < pointCount; i++)
for (int i = 0; i < pointCount - 1; i++)
{
if (CheckCollisionPointCircle(GetMousePosition(), control[i].start, 6.0f))
{
@ -186,10 +189,20 @@ int main(void)
else if (splineTypeActive == SPLINE_BEZIER)
{
// Draw spline: cubic-bezier (with control points)
Vector2 fullPoints[3*(MAX_SPLINE_POINTS-1)+1] = {0};
for (int i = 0; i < pointCount-1; i++) {
fullPoints[3*i] = points[i];
fullPoints[3*i+1] = control[i].start;
fullPoints[3*i+2] = control[i].end;
}
fullPoints[3*(pointCount-1)] = points[pointCount-1],
DrawSplineBezierCubic(fullPoints, 3*(pointCount-1)+1, splineThickness, RED);
for (int i = 0; i < pointCount - 1; i++)
{
// Drawing individual segments, not considering thickness connection compensation
DrawSplineSegmentBezierCubic(points[i], control[i].start, control[i].end, points[i + 1], splineThickness, RED);
// DrawSplineSegmentBezierCubic(points[i], control[i].start, control[i].end, points[i + 1], splineThickness, RED);
// Every cubic bezier point should have two control points
DrawCircleV(control[i].start, 6, GOLD);
@ -244,4 +257,4 @@ int main(void)
//--------------------------------------------------------------------------------------
return 0;
}
}

14
src/rshapes.c
View File

@ -1832,8 +1832,11 @@ void DrawSplineCatmullRom(const Vector2 *points, int pointCount, float thick, Co
void DrawSplineBezierQuadratic(const Vector2 *points, int pointCount, float thick, Color color)
{
if (pointCount < 3) return;
for (int i = 0; i < pointCount - 2; i++)
for (int i = 2; i < pointCount - 2; i += 2)
{
DrawCircleV(points[i], thick/2.0f, color);
}
for (int i = 0; i < pointCount - 2; i += 2)
{
DrawSplineSegmentBezierQuadratic(points[i], points[i + 1], points[i + 2], thick, color);
}
@ -1843,8 +1846,11 @@ void DrawSplineBezierQuadratic(const Vector2 *points, int pointCount, float thic
void DrawSplineBezierCubic(const Vector2 *points, int pointCount, float thick, Color color)
{
if (pointCount < 4) return;
for (int i = 0; i < pointCount - 3; i++)
for (int i = 3; i < pointCount - 3; i += 3)
{
DrawCircleV(points[i], thick/2.0f, color);
}
for (int i = 0; i < pointCount - 3; i += 3)
{
DrawSplineSegmentBezierCubic(points[i], points[i + 1], points[i + 2], points[i + 3], thick, color);
}