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removed keys, moved global to local, conventions & comments, show target fps

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RobinsAviary 2025-09-30 07:17:51 -04:00
parent 3c8e5b81f8
commit 86fa901ff2
1 changed files with 14 additions and 32 deletions
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46
examples/core/core_delta_time.c
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@ -21,15 +21,6 @@ Try to be very organized, using line-breaks appropiately
#include "raylib.h" #include "raylib.h"
int currentFps = 60;
// Used only in this example in order to allow finer control of the FPS limit.
void UpdateFPS(int fps)
{
currentFps = fps;
SetTargetFPS(currentFps);
}
//------------------------------------------------------------------------------------ //------------------------------------------------------------------------------------
// Program main entry point // Program main entry point
//------------------------------------------------------------------------------------ //------------------------------------------------------------------------------------
@ -42,6 +33,8 @@ int main(void)
InitWindow(screenWidth, screenHeight, "raylib [core] example - delta time"); InitWindow(screenWidth, screenHeight, "raylib [core] example - delta time");
int currentFps = 60;
// Store the position for the both of the circles. // Store the position for the both of the circles.
Vector2 deltaCircle = {0, screenHeight / 3.0f}; Vector2 deltaCircle = {0, screenHeight / 3.0f};
Vector2 frameCircle = {0, screenHeight * (2.0f/3.0f)}; Vector2 frameCircle = {0, screenHeight * (2.0f/3.0f)};
@ -57,26 +50,14 @@ int main(void)
while (!WindowShouldClose()) // Detect window close button or ESC key while (!WindowShouldClose()) // Detect window close button or ESC key
{ {
// Update // Update
//----------------------------------------------
// Update the target FPS based on number key. if (IsKeyPressed(KEY_R)) // Reset both circles' positions when you press R
if (IsKeyPressed(KEY_ONE)) UpdateFPS(10);
if (IsKeyPressed(KEY_TWO)) UpdateFPS(20);
if (IsKeyPressed(KEY_THREE)) UpdateFPS(30);
if (IsKeyPressed(KEY_FOUR)) UpdateFPS(40);
if (IsKeyPressed(KEY_FIVE)) UpdateFPS(50);
if (IsKeyPressed(KEY_SIX)) UpdateFPS(60);
if (IsKeyPressed(KEY_SEVEN)) UpdateFPS(70);
if (IsKeyPressed(KEY_EIGHT)) UpdateFPS(80);
if (IsKeyPressed(KEY_NINE)) UpdateFPS(90);
if (IsKeyPressed(KEY_ZERO)) UpdateFPS(0); // Unlimited framerate
if (IsKeyPressed(KEY_R)) // Reset both circles' positions when you press R.
{ {
deltaCircle.x = 0; deltaCircle.x = 0;
frameCircle.x = 0; frameCircle.x = 0;
} }
// Adjust the FPS target based on the mouse wheel. // Adjust the FPS target based on the mouse wheel
float mouseWheel = GetMouseWheelMove(); float mouseWheel = GetMouseWheelMove();
if (mouseWheel != 0) if (mouseWheel != 0)
{ {
@ -84,15 +65,15 @@ int main(void)
SetTargetFPS(currentFps); SetTargetFPS(currentFps);
} }
// GetFrameTime() returns the time it took to draw the last frame, in seconds (usually called delta time). // GetFrameTime() returns the time it took to draw the last frame, in seconds (usually called delta time)
// Uses the delta time to make the circle look like it's moving at a "consistent" speed regardless of FPS. // Uses the delta time to make the circle look like it's moving at a "consistent" speed regardless of FPS
// Multiply by 6.0 (an arbitrary value) in order to make the speed visually closer to the other circle (at 60 fps), for comparison. // Multiply by 6.0 (an arbitrary value) in order to make the speed visually closer to the other circle (at 60 fps), for comparison
deltaCircle.x += GetFrameTime() * 6.0f * speed; deltaCircle.x += GetFrameTime() * 6.0f * speed;
// This circle can move faster or slower visually depending on the FPS. // This circle can move faster or slower visually depending on the FPS
frameCircle.x += .1f * speed; frameCircle.x += .1f * speed;
// If either circle is off the screen, reset it back to the start. // If either circle is off the screen, reset it back to the start
if (deltaCircle.x > screenWidth) if (deltaCircle.x > screenWidth)
{ {
deltaCircle.x = 0; deltaCircle.x = 0;
@ -127,14 +108,15 @@ int main(void)
// Special text for when the FPS target is set to 0 or less, which makes it unlimited. // Special text for when the FPS target is set to 0 or less, which makes it unlimited.
fpsText = TextFormat("fps: unlimited (%i)", GetFPS()); fpsText = TextFormat("fps: unlimited (%i)", GetFPS());
} }
else { else
fpsText = TextFormat("fps: %i", GetFPS()); {
fpsText = TextFormat("fps: %i (target: %i)", GetFPS(), currentFps);
} }
// Draw the help text // Draw the help text
DrawText(fpsText, 10, 10, 20, DARKGRAY); DrawText(fpsText, 10, 10, 20, DARKGRAY);
DrawText(TextFormat("frame time: %02.02f ms", GetFrameTime()), 10, 30, 20, DARKGRAY); DrawText(TextFormat("frame time: %02.02f ms", GetFrameTime()), 10, 30, 20, DARKGRAY);
DrawText("use the scroll wheel/number keys to change the fps limit, r to reset", 10, 50, 20, DARKGRAY); DrawText("use the scroll wheel to change the fps limit, r to reset", 10, 50, 20, DARKGRAY);
// Draw the text above the circles. // Draw the text above the circles.
DrawText("x += GetFrameTime() * speed", 10, 90, 20, RED); DrawText("x += GetFrameTime() * speed", 10, 90, 20, RED);