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Diffstat (limited to 'examples/shapes/shapes_splines_drawing.c')
| -rw-r--r-- | examples/shapes/shapes_splines_drawing.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/examples/shapes/shapes_splines_drawing.c b/examples/shapes/shapes_splines_drawing.c new file mode 100644 index 00000000..711aad21 --- /dev/null +++ b/examples/shapes/shapes_splines_drawing.c @@ -0,0 +1,201 @@ +/******************************************************************************************* +* +* 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" + +#include <stdlib.h> // Required for: NULL + +#define MAX_SPLINE_POINTS 32 + +// 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, + SPLINE_BASIS, // B-Spline + SPLINE_CATMULLROM, + SPLINE_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++) + { + DrawSplineBezierCubic(points[i], control[i].start, control[i].end, points[i + 1], 2.0f, 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 key-points + for (int i = 0; i < pointCount; i++) + { + DrawCircleV(points[i], (focusedPoint == i)? 8.0f : 5.0f, (focusedPoint == i)? BLUE: RED); + if ((splineType != 0) && (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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