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Use logarithmic zoom scaling in 2d camera zoom examples

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This commit is contained in:
Fabrizio Pietrucci 2025-03-19 19:48:04 +01:00
parent cd9206956c
commit 8b84c999d2
2 changed files with 10 additions and 8 deletions
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4
examples/core/core_2d_camera.c
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@ -14,6 +14,7 @@
********************************************************************************************/ ********************************************************************************************/
#include "raylib.h" #include "raylib.h"
#include <math.h>
#define MAX_BUILDINGS 100 #define MAX_BUILDINGS 100
@ -81,7 +82,8 @@ int main(void)
else if (camera.rotation < -40) camera.rotation = -40; else if (camera.rotation < -40) camera.rotation = -40;
// Camera zoom controls // Camera zoom controls
camera.zoom += ((float)GetMouseWheelMove()*0.05f); // Uses log scaling to provide consistent zoom speed
camera.zoom = expf(logf(camera.zoom) + ((float)GetMouseWheelMove()*0.05f));
if (camera.zoom > 3.0f) camera.zoom = 3.0f; if (camera.zoom > 3.0f) camera.zoom = 3.0f;
else if (camera.zoom < 0.1f) camera.zoom = 0.1f; else if (camera.zoom < 0.1f) camera.zoom = 0.1f;

14
examples/core/core_2d_camera_mouse_zoom.c
View file

@ -73,9 +73,9 @@ int main ()
camera.target = mouseWorldPos; camera.target = mouseWorldPos;
// Zoom increment // Zoom increment
float scaleFactor = 1.0f + (0.25f*fabsf(wheel)); // Uses log scaling to provide consistent zoom speed
if (wheel < 0) scaleFactor = 1.0f/scaleFactor; float scale = 0.2f*wheel;
camera.zoom = Clamp(camera.zoom*scaleFactor, 0.125f, 64.0f); camera.zoom = Clamp(expf(logf(camera.zoom)+scale), 0.125f, 64.0f);
} }
} }
else else
@ -96,10 +96,10 @@ int main ()
if (IsMouseButtonDown(MOUSE_BUTTON_RIGHT)) if (IsMouseButtonDown(MOUSE_BUTTON_RIGHT))
{ {
// Zoom increment // Zoom increment
// Uses log scaling to provide consistent zoom speed
float deltaX = GetMouseDelta().x; float deltaX = GetMouseDelta().x;
float scaleFactor = 1.0f + (0.01f*fabsf(deltaX)); float scale = 0.005f*deltaX;
if (deltaX < 0) scaleFactor = 1.0f/scaleFactor; camera.zoom = Clamp(expf(logf(camera.zoom)+scale), 0.125f, 64.0f);
camera.zoom = Clamp(camera.zoom*scaleFactor, 0.125f, 64.0f);
} }
} }
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
@ -143,4 +143,4 @@ int main ()
CloseWindow(); // Close window and OpenGL context CloseWindow(); // Close window and OpenGL context
//-------------------------------------------------------------------------------------- //--------------------------------------------------------------------------------------
return 0; return 0;
} }