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Add variable thickness helpers for SPLINE_LINEAR_VAR

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This commit is contained in:
Amy Wilder 2025-08-02 16:04:56 -04:00
parent 3915469c78
commit 74792bc496
1 changed files with 58 additions and 20 deletions
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78
examples/shapes/shapes_splines_drawing.c
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@ -14,6 +14,7 @@
********************************************************************************************/
#include "raylib.h"
#include "raymath.h"
#define RAYGUI_IMPLEMENTATION
#include "raygui.h" // Required for UI controls
@ -21,6 +22,7 @@
#include <stdlib.h> // Required for: NULL
#define MAX_SPLINE_POINTS 32
#define SPLINE_THICK_COUNT 4
// Cubic Bezier spline control points
// NOTE: Every segment has two control points
@ -60,6 +62,13 @@ int main(void)
{ 710.0f, 260.0f },
};
float thicks[SPLINE_THICK_COUNT] = {
0.0f,
8.0f,
8.0f,
0.0f,
};
// Array required for spline bezier-cubic,
// including control points interleaved with start-end segment points
Vector2 pointsInterleaved[3*(MAX_SPLINE_POINTS - 1) + 1] = { 0 };
@ -71,7 +80,7 @@ int main(void)
Vector2 *focusedControlPoint = NULL;
// Cubic Bezier control points initialization
ControlPoint control[MAX_SPLINE_POINTS-1] = { 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 };
@ -230,28 +239,14 @@ int main(void)
}
else if (splineTypeActive == SPLINE_LINEAR_VAR)
{
float thicks[] = {
0.0f,
splineThickness,
-splineThickness,
splineThickness,
};
// Draw spline: variable-width linear
for (int i = 0; i < pointCount - 1; ++i)
{
DrawSplineSegmentLinearVar(points[i], points[i+1], thicks, 4, RED);
DrawSplineSegmentLinearVar(points[i], points[i + 1], thicks, SPLINE_THICK_COUNT, RED);
}
}
else if (splineTypeActive == SPLINE_BEZIER_VAR)
{
float thicks[] = {
0.0f,
splineThickness,
splineThickness,
0.0f,
};
// NOTE: Cubic-bezier spline requires the 2 control points of each segnment to be
// provided interleaved with the start and end point of every segment
for (int i = 0; i < (pointCount - 1); i++)
@ -266,7 +261,7 @@ int main(void)
// Draw spline: variable-width cubic-bezier (with control points)
for (int i = 0; i < pointCount - 1; ++i)
{
DrawSplineSegmentBezierCubicVar(points[i], control[i].start, control[i].end, points[i+1], thicks, 4, RED);
DrawSplineSegmentBezierCubicVar(points[i], control[i].start, control[i].end, points[i + 1], thicks, SPLINE_THICK_COUNT, RED);
}
}
@ -304,16 +299,59 @@ int main(void)
DrawText(TextFormat("[%.0f, %.0f]", points[i].x, points[i].y), (int)points[i].x, (int)points[i].y + 10, 10, BLACK);
}
if (splineTypeActive == SPLINE_LINEAR_VAR)
{
Vector2 thickAnchors[SPLINE_THICK_COUNT] = { 0 };
Vector2 thickPoints[SPLINE_THICK_COUNT] = { 0 };
// Draw spline thickness helpers
for (int i = 0; i < pointCount - 1; i++)
{
Vector2 direction = Vector2Normalize(GetSplineVelocityLinear(points[i], points[i + 1]));
Vector2 perpendicular = (Vector2){ direction.y, -direction.x };
for (int j = 0; j < SPLINE_THICK_COUNT; j++)
{
Vector2 point = GetSplinePointLinear(points[i], points[i + 1], j/3.0f);
thickAnchors[j] = point;
thickPoints[j] = Vector2Add(point, Vector2Scale(perpendicular, thicks[j]));
}
DrawLineV(thickPoints[0], thickPoints[1], GRAY);
DrawLineV(thickPoints[3], thickPoints[2], GRAY);
for (int j = 0; j < SPLINE_THICK_COUNT; j++)
{
DrawCircleLinesV(thickPoints[j], 4.0f, PURPLE);
DrawLineV(Vector2Add(thickAnchors[j], Vector2Scale(perpendicular, 4.0f)), Vector2Subtract(thickAnchors[j], Vector2Scale(perpendicular, 4.0f)), GRAY);
}
DrawLineV(points[i], points[i + 1], BROWN);
DrawSplineBezierCubic(thickPoints, SPLINE_THICK_COUNT, 1.0f, ORANGE);
}
}
}
// Check all possible UI states that require controls lock
if (splineTypeEditMode || (selectedPoint != -1) || (selectedControlPoint != NULL)) GuiLock();
// Draw spline config
GuiLabel((Rectangle){ 12, 62, 140, 24 }, TextFormat("Spline thickness: %i", (int)splineThickness));
GuiSliderBar((Rectangle){ 12, 60 + 24, 140, 16 }, NULL, NULL, &splineThickness, 1.0f, 40.0f);
if ((splineTypeActive == SPLINE_LINEAR_VAR) || (splineTypeActive == SPLINE_BEZIER_VAR))
{
GuiLabel((Rectangle){ 12, 68 + 24, 200, 24 }, TextFormat("Spline thickness: %i, %i, %i, %i", (int)thicks[0], (int)thicks[1], (int)thicks[2], (int)thicks[3]));
GuiSlider((Rectangle){ 12, 68 + 24 + 30, 140, 16 }, NULL, NULL, &thicks[0], -40.0, 40.0f);
GuiSlider((Rectangle){ 12, 68 + 24 + 50, 140, 16 }, NULL, NULL, &thicks[1], -40.0, 40.0f);
GuiSlider((Rectangle){ 12, 68 + 24 + 70, 140, 16 }, NULL, NULL, &thicks[2], -40.0, 40.0f);
GuiSlider((Rectangle){ 12, 68 + 24 + 90, 140, 16 }, NULL, NULL, &thicks[3], -40.0, 40.0f);
}
else
{
GuiLabel((Rectangle){ 12, 68 + 24, 140, 24 }, TextFormat("Spline thickness: %i", (int)splineThickness));
GuiSliderBar((Rectangle){ 12, 68 + 48, 140, 16 }, NULL, NULL, &splineThickness, 1.0f, 40.0f);
}
GuiCheckBox((Rectangle){ 12, 110, 20, 20 }, "Show point helpers", &splineHelpersActive);
GuiCheckBox((Rectangle){ 12, 68, 20, 20 }, "Show point helpers", &splineHelpersActive);
if (splineTypeEditMode) GuiUnlock();