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/*******************************************************************************************
*
* raylib [shapes] example - splines drawing
*
* Example originally created with raylib 4.6-dev, last time updated with raylib 4.6-dev
*
* 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 MAX_CONTROL_POINTS 32
typedef struct {
Vector2 start;
Vector2 end;
} ControlPoint;
//------------------------------------------------------------------------------------
// 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_CONTROL_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 splineType = 0; // 0-Linear, 1-BSpline, 2-CatmullRom, 3-Bezier
// Cubic Bezier control points
ControlPoint control[MAX_CONTROL_POINTS] = { 0 };
for (int i = 0; i < pointCount - 1; i++)
{
control[i].start = points[i];
control[i].end = points[i + 1];
}
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
//----------------------------------------------------------------------------------
// Points movement logic
if (IsMouseButtonPressed(MOUSE_RIGHT_BUTTON) && (pointCount < MAX_CONTROL_POINTS))
{
points[pointCount] = GetMousePosition();
pointCount++;
}
for (int i = 0; i < pointCount; i++)
{
if (IsMouseButtonDown(MOUSE_LEFT_BUTTON) && CheckCollisionPointCircle(GetMousePosition(), points[i], 6.0f))
{
selectedPoint = i;
break;
}
}
if (selectedPoint >= 0)
{
points[selectedPoint] = GetMousePosition();
if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON)) selectedPoint = -1;
}
// TODO: Cubic Bezier spline control points logic
// 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 == 0) // Linear
{
// Draw linear spline
for (int i = 0; i < pointCount - 1; i++)
{
DrawLineEx(points[i], points[i + 1], 2.0f, RED);
}
}
else if (splineType == 1) // B-Spline
{
// Draw b-spline
DrawLineBSpline(points, pointCount, 2.0f, RED);
//for (int i = 0; i < (pointCount - 3); i++) DrawLineBSplineSegment(points[i], points[i + 1], points[i + 2], points[i + 3], 24.0f, BLUE);
}
else if (splineType == 2) // CatmullRom Spline
{
// Draw spline: catmull-rom
DrawLineCatmullRom(points, pointCount, 2.0f, RED);
//for (int i = 0; i < (pointCount - 3); i++) DrawLineCatmullRomSegment(points[i], points[i + 1], points[i + 2], points[i + 3], 24.0f, Fade(BLUE, 0.4f));
}
else if (splineType == 3) // Cubic Bezier
{
// Draw line bezier cubic (with control points)
for (int i = 0; i < pointCount - 1; i++)
{
DrawLineBezierCubic(points[i], points[i + 1], control[i].start, control[i + 1].end, 2.0f, RED);
// TODO: Every cubic bezier point should have two control points
DrawCircleV(control[i].start, 4, GOLD);
DrawCircleV(control[i].end, 4, GOLD);
DrawLineEx(points[i], control[i].start, 1.0, LIGHTGRAY);
DrawLineEx(points[i + 1], control[i].end, 1.0, LIGHTGRAY);
}
}
// Draw control points
for (int i = 0; i < pointCount; i++)
{
DrawCircleV(points[i], 6.0f, RED);
if ((splineType != 0) && (i < pointCount - 1)) DrawLineV(points[i], points[i + 1], GRAY);
}
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
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