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/*******************************************************************************************
*
* raylib [shapes] example - splines drawing
*
* Example originally created with raylib 5.0, last time updated with raylib 5.0
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2023 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#define RAYGUI_IMPLEMENTATION
#include "raygui.h" // Required for UI controls
#include <stdlib.h> // Required for: NULL
#define MAX_SPLINE_POINTS 32
// Cubic Bezier spline control points
// NOTE: Every segment has two control points
typedef struct {
Vector2 start;
Vector2 end;
} ControlPoint;
// Spline types
typedef enum {
SPLINE_LINEAR = 0, // Linear
SPLINE_BASIS, // B-Spline
SPLINE_CATMULLROM, // Catmull-Rom
SPLINE_BEZIER // Cubic Bezier
} SplineType;
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
SetConfigFlags(FLAG_MSAA_4X_HINT);
InitWindow(screenWidth, screenHeight, "raylib [shapes] example - splines drawing");
Vector2 points[MAX_SPLINE_POINTS] = {
{ 50.0f, 400.0f },
{ 160.0f, 220.0f },
{ 340.0f, 380.0f },
{ 520.0f, 60.0f },
{ 710.0f, 260.0f },
};
// Array required for spline bezier-cubic,
// including control points interleaved with start-end segment points
Vector2 pointsInterleaved[3*(MAX_SPLINE_POINTS - 1) + 1] = { 0 };
int pointCount = 5;
int selectedPoint = -1;
int focusedPoint = -1;
Vector2 *selectedControlPoint = NULL;
Vector2 *focusedControlPoint = NULL;
// Cubic Bezier control points initialization
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 };
control[i].end = (Vector2){ points[i + 1].x - 50, points[i + 1].y };
}
// Spline config variables
float splineThickness = 8.0f;
int splineTypeActive = SPLINE_LINEAR; // 0-Linear, 1-BSpline, 2-CatmullRom, 3-Bezier
bool splineTypeEditMode = false;
bool splineHelpersActive = true;
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
// Spline points creation logic (at the end of spline)
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++;
}
// Spline point focus and selection logic
for (int i = 0; i < pointCount; i++)
{
if (CheckCollisionPointCircle(GetMousePosition(), points[i], 8.0f))
{
focusedPoint = i;
if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) selectedPoint = i;
break;
}
else focusedPoint = -1;
}
// Spline point movement logic
if (selectedPoint >= 0)
{
points[selectedPoint] = GetMousePosition();
if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON)) selectedPoint = -1;
}
// Cubic Bezier spline control points logic
if ((splineTypeActive == SPLINE_BEZIER) && (focusedPoint == -1))
{
// Spline control point focus and selection logic
for (int i = 0; i < pointCount - 1; i++)
{
if (CheckCollisionPointCircle(GetMousePosition(), control[i].start, 6.0f))
{
focusedControlPoint = &control[i].start;
if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) selectedControlPoint = &control[i].start;
break;
}
else if (CheckCollisionPointCircle(GetMousePosition(), control[i].end, 6.0f))
{
focusedControlPoint = &control[i].end;
if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) selectedControlPoint = &control[i].end;
break;
}
else focusedControlPoint = NULL;
}
// Spline control point movement logic
if (selectedControlPoint != NULL)
{
*selectedControlPoint = GetMousePosition();
if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON)) selectedControlPoint = NULL;
}
}
// Spline selection logic
if (IsKeyPressed(KEY_ONE)) splineTypeActive = 0;
else if (IsKeyPressed(KEY_TWO)) splineTypeActive = 1;
else if (IsKeyPressed(KEY_THREE)) splineTypeActive = 2;
else if (IsKeyPressed(KEY_FOUR)) splineTypeActive = 3;
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
if (splineTypeActive == SPLINE_LINEAR)
{
// Draw spline: linear
DrawSplineLinear(points, pointCount, splineThickness, RED);
}
else if (splineTypeActive == SPLINE_BASIS)
{
// Draw spline: basis
DrawSplineBasis(points, pointCount, splineThickness, RED); // Provide connected points array
/*
for (int i = 0; i < (pointCount - 3); i++)
{
// Drawing individual segments, not considering thickness connection compensation
DrawSplineSegmentBasis(points[i], points[i + 1], points[i + 2], points[i + 3], splineThickness, MAROON);
}
*/
}
else if (splineTypeActive == SPLINE_CATMULLROM)
{
// Draw spline: catmull-rom
DrawSplineCatmullRom(points, pointCount, splineThickness, RED); // Provide connected points array
/*
for (int i = 0; i < (pointCount - 3); i++)
{
// Drawing individual segments, not considering thickness connection compensation
DrawSplineSegmentCatmullRom(points[i], points[i + 1], points[i + 2], points[i + 3], splineThickness, MAROON);
}
*/
}
else if (splineTypeActive == SPLINE_BEZIER)
{
// 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++)
{
pointsInterleaved[3*i] = points[i];
pointsInterleaved[3*i + 1] = control[i].start;
pointsInterleaved[3*i + 2] = control[i].end;
}
pointsInterleaved[3*(pointCount - 1)] = points[pointCount - 1];
// Draw spline: cubic-bezier (with control points)
DrawSplineBezierCubic(pointsInterleaved, 3*(pointCount - 1) + 1, splineThickness, RED);
/*
for (int i = 0; i < 3*(pointCount - 1); i += 3)
{
// Drawing individual segments, not considering thickness connection compensation
DrawSplineSegmentBezierCubic(pointsInterleaved[i], pointsInterleaved[i + 1], pointsInterleaved[i + 2], pointsInterleaved[i + 3], splineThickness, MAROON);
}
*/
// Draw spline control points
for (int i = 0; i < pointCount - 1; i++)
{
// Every cubic bezier point have two control points
DrawCircleV(control[i].start, 6, GOLD);
DrawCircleV(control[i].end, 6, GOLD);
if (focusedControlPoint == &control[i].start) DrawCircleV(control[i].start, 8, GREEN);
else if (focusedControlPoint == &control[i].end) DrawCircleV(control[i].end, 8, GREEN);
DrawLineEx(points[i], control[i].start, 1.0f, LIGHTGRAY);
DrawLineEx(points[i + 1], control[i].end, 1.0f, LIGHTGRAY);
// Draw spline control lines
DrawLineV(points[i], control[i].start, GRAY);
//DrawLineV(control[i].start, control[i].end, LIGHTGRAY);
DrawLineV(control[i].end, points[i + 1], GRAY);
}
}
if (splineHelpersActive)
{
// Draw spline point helpers
for (int i = 0; i < pointCount; i++)
{
DrawCircleLinesV(points[i], (focusedPoint == i)? 12.0f : 8.0f, (focusedPoint == i)? BLUE: DARKBLUE);
if ((splineTypeActive != SPLINE_LINEAR) &&
(splineTypeActive != SPLINE_BEZIER) &&
(i < pointCount - 1)) DrawLineV(points[i], points[i + 1], GRAY);
DrawText(TextFormat("[%.0f, %.0f]", points[i].x, points[i].y), (int)points[i].x, (int)points[i].y + 10, 10, BLACK);
}
}
// Check all possible UI states that require controls lock
if (splineTypeEditMode) 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);
GuiCheckBox((Rectangle){ 12, 110, 20, 20 }, "Show point helpers", &splineHelpersActive);
GuiUnlock();
GuiLabel((Rectangle){ 12, 10, 140, 24 }, "Spline type:");
if (GuiDropdownBox((Rectangle){ 12, 8 + 24, 140, 28 }, "LINEAR;BSPLINE;CATMULLROM;BEZIER", &splineTypeActive, splineTypeEditMode)) splineTypeEditMode = !splineTypeEditMode;
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
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