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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"
#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] = {
{ 100.0f, 200.0f },
{ 300.0f, 400.0f },
{ 500.0f, 300.0f },
{ 700.0f, 100.0f },
{ 200.0f, 100.0f },
};
int pointCount = 5;
int selectedPoint = -1;
int focusedPoint = -1;
Vector2 *selectedControlPoint = NULL;
Vector2 *focusedControlPoint = NULL;
int splineType = SPLINE_LINEAR; // 0-Linear, 1-BSpline, 2-CatmullRom, 3-Bezier
// Cubic Bezier control points initialization
ControlPoint control[MAX_SPLINE_POINTS] = { 0 };
for (int i = 0; i < pointCount - 1; i++)
{
control[i].start = (Vector2){ points[i].x - 20, points[i].y - 20 };
control[i].end = (Vector2){ points[i + 1].x + 20, points[i + 1].y + 20 };
}
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();
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 ((splineType == SPLINE_BEZIER) && (focusedPoint == -1))
{
// Spline control point focus and selection logic
for (int i = 0; i < pointCount; 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)) splineType = 0;
else if (IsKeyPressed(KEY_TWO)) splineType = 1;
else if (IsKeyPressed(KEY_THREE)) splineType = 2;
else if (IsKeyPressed(KEY_FOUR)) splineType = 3;
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
if (splineType == SPLINE_LINEAR)
{
// Draw spline: linear
DrawSplineLinear(points, pointCount, 2.0f, RED);
}
else if (splineType == SPLINE_BASIS)
{
// Draw spline: basis
DrawSplineBasis(points, pointCount, 2.0f, RED);
//for (int i = 0; i < (pointCount - 3); i++) DrawSplineBasisSegment(points[i], points[i + 1], points[i + 2], points[i + 3], 24.0f, BLUE);
}
else if (splineType == SPLINE_CATMULLROM)
{
// Draw spline: catmull-rom
DrawSplineCatmullRom(points, pointCount, 2.0f, RED);
//for (int i = 0; i < (pointCount - 3); i++) DrawSplineCatmullRomSegment(points[i], points[i + 1], points[i + 2], points[i + 3], 24.0f, Fade(BLUE, 0.4f));
}
else if (splineType == SPLINE_BEZIER)
{
// Draw spline: cubic-bezier (with control points)
for (int i = 0; i < pointCount - 1; i++)
{
DrawSplineSegmentBezierCubic(points[i], control[i].start, control[i].end, points[i + 1], 10.0f, RED);
// Every cubic bezier point should have two control points
DrawCircleV(control[i].start, 4, GOLD);
DrawCircleV(control[i].end, 4, GOLD);
if (focusedControlPoint == &control[i].start) DrawCircleV(control[i].start, 6, GREEN);
else if (focusedControlPoint == &control[i].end) DrawCircleV(control[i].end, 6, GREEN);
DrawLineEx(points[i], control[i].start, 1.0, LIGHTGRAY);
DrawLineEx(points[i + 1], control[i].end, 1.0, LIGHTGRAY);
// Draw spline control lines
DrawLineV(points[i], control[i].start, LIGHTGRAY);
DrawLineV(control[i].start, control[i].end, LIGHTGRAY);
DrawLineV(control[i].end, points[i + 1], LIGHTGRAY);
}
}
// Draw spline key-points
for (int i = 0; i < pointCount; i++)
{
DrawCircleV(points[i], (focusedPoint == i)? 8.0f : 5.0f, (focusedPoint == i)? BLUE: RED);
if ((splineType != SPLINE_LINEAR) &&
(splineType != SPLINE_BEZIER) &&
(i < pointCount - 1)) DrawLineV(points[i], points[i + 1], LIGHTGRAY);
}
// TODO: Draw help
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
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