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Example resize fixes using IsWindowResized()

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This commit is contained in:
Jon Daniel 2025-08-02 00:07:46 +02:00
commit b16313a2d3
1 changed files with 325 additions and 177 deletions
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33
examples/shapes/shapes_double_pendulum.c
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@ -25,9 +25,6 @@
#define SCREEN_WIDTH 800
#define SCREEN_HEIGHT 450
#define CENTER_X SCREEN_WIDTH * 0.5
#define CENTER_Y SCREEN_HEIGHT * 0.5 - 100
// Constant for Simulation
#define SIMULATION_STEPS 30
#define G 9.81
@ -37,7 +34,7 @@
//----------------------------------------------------------------------------------
static Vector2 CalculatePendulumEndPoint(float l, float theta);
static Vector2 CalculateDoublePendulumEndPoint(float l1, float theta1, float l2, float theta2);
static Vector2 CalculateCenter(Vector2 screenSize) { return (Vector2){ screenSize.x * 0.5, screenSize.y * 0.5 - 100 }; }
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
@ -47,6 +44,8 @@ int main(void)
//--------------------------------------------------------------------------------------
SetConfigFlags(FLAG_WINDOW_HIGHDPI);
InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "raylib [shapes] example - Double Pendulum");
Vector2 screenSize = { GetScreenWidth(), GetScreenHeight() };
Vector2 screenCenter = CalculateCenter(screenSize);
// Simulation Paramters
//--------------------------------------------------------------------------------------
@ -56,8 +55,8 @@ int main(void)
float totalM = m1 + m2;
Vector2 previousPosition = CalculateDoublePendulumEndPoint(l1, theta1, l2, theta2);
previousPosition.x += CENTER_X;
previousPosition.y += CENTER_Y;
previousPosition.x += screenCenter.x;
previousPosition.y += screenCenter.y;
// Scale length
float L1 = l1 * lengthScaler;
@ -70,7 +69,7 @@ int main(void)
// Create Framebuffer
//--------------------------------------------------------------------------------------
RenderTexture2D target = LoadRenderTexture(SCREEN_WIDTH, SCREEN_HEIGHT);
RenderTexture2D target = LoadRenderTexture(screenSize.x, screenSize.y);
SetTextureFilter(target.texture, TEXTURE_FILTER_BILINEAR);
SetTargetFPS(60);
@ -82,6 +81,16 @@ int main(void)
// Update
float dt = GetFrameTime();
float step = dt / SIMULATION_STEPS, step2 = step * step;
if(IsWindowResized())
{
// Update screen dimensions
screenSize.x = GetScreenWidth();
screenSize.y = GetScreenHeight();
screenCenter = CalculateCenter(screenSize);
UnloadRenderTexture(target);
target = LoadRenderTexture(screenSize.x, screenSize.y);
SetTextureFilter(target.texture, TEXTURE_FILTER_BILINEAR);
}
// Update Physics - larger steps = better approximation
//----------------------------------------------------------------------------------
@ -115,15 +124,15 @@ int main(void)
// Calculate position
Vector2 currentPosition = CalculateDoublePendulumEndPoint(l1, theta1, l2, theta2);
currentPosition.x += CENTER_X;
currentPosition.y += CENTER_Y;
currentPosition.x += screenCenter.x;
currentPosition.y += screenCenter.y;
// Draw to framebuffer
//----------------------------------------------------------------------------------
BeginTextureMode(target);
// Draw a transparent rectangle - smaller alpha = longer trails
DrawRectangle(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, Fade(BLACK, fateAlpha));
DrawRectangle(0, 0, screenSize.x, screenSize.y, Fade(BLACK, fateAlpha));
// Draw trail
DrawCircleV(previousPosition, trailThick, RED);
@ -146,11 +155,11 @@ int main(void)
(Vector2){ 0, 0 }, WHITE);
// Draw Double Pendulum
DrawRectanglePro((Rectangle){ CENTER_X, CENTER_Y, 10 * l1, lineThick },
DrawRectanglePro((Rectangle){ screenCenter.x, screenCenter.y, 10 * l1, lineThick },
(Vector2){0, lineThick * 0.5}, 90 - RAD2DEG * theta1, RAYWHITE);
Vector2 endpoint1 = CalculatePendulumEndPoint(l1, theta1);
DrawRectanglePro((Rectangle){ CENTER_X + endpoint1.x, CENTER_Y + endpoint1.y, 10 * l2, lineThick },
DrawRectanglePro((Rectangle){ screenCenter.x + endpoint1.x, screenCenter.y + endpoint1.y, 10 * l2, lineThick },
(Vector2){0, lineThick * 0.5}, 90 - RAD2DEG * theta2, RAYWHITE);
EndDrawing();