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/*******************************************************************************************
*
* raylib [core] example - 2d camera mouse zoom
*
* Example originally created with raylib 4.2, last time updated with raylib 4.2
*
* 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) 2022-2024 Jeffery Myers (@JeffM2501)
*
********************************************************************************************/
#include "raylib.h"
#include "rlgl.h"
#include "raymath.h"
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main ()
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [core] example - 2d camera mouse zoom");
Camera2D camera = { 0 };
camera.zoom = 1.0f;
int zoomMode = 0; // 0-Mouse Wheel, 1-Mouse Move
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
//----------------------------------------------------------------------------------
if (IsKeyPressed(KEY_ONE)) zoomMode = 0;
else if (IsKeyPressed(KEY_TWO)) zoomMode = 1;
// Translate based on mouse right click
if (IsMouseButtonDown(MOUSE_BUTTON_RIGHT))
{
Vector2 delta = GetMouseDelta();
delta = Vector2Scale(delta, -1.0f/camera.zoom);
camera.target = Vector2Add(camera.target, delta);
}
if (zoomMode == 0)
{
// Zoom based on mouse wheel
float wheel = GetMouseWheelMove();
if (wheel != 0)
{
// Get the world point that is under the mouse
Vector2 mouseWorldPos = GetScreenToWorld2D(GetMousePosition(), camera);
// Set the offset to where the mouse is
camera.offset = GetMousePosition();
// Set the target to match, so that the camera maps the world space point
// under the cursor to the screen space point under the cursor at any zoom
camera.target = mouseWorldPos;
// Zoom increment
float scaleFactor = 1.0f + (0.25f*fabsf(wheel));
if (wheel < 0) scaleFactor = 1.0f/scaleFactor;
camera.zoom = Clamp(camera.zoom*scaleFactor, 0.125f, 64.0f);
}
}
else
{
// Zoom based on mouse left click
if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT))
{
// Get the world point that is under the mouse
Vector2 mouseWorldPos = GetScreenToWorld2D(GetMousePosition(), camera);
// Set the offset to where the mouse is
camera.offset = GetMousePosition();
// Set the target to match, so that the camera maps the world space point
// under the cursor to the screen space point under the cursor at any zoom
camera.target = mouseWorldPos;
}
if (IsMouseButtonDown(MOUSE_BUTTON_LEFT))
{
// Zoom increment
float deltaX = GetMouseDelta().x;
float scaleFactor = 1.0f + (0.01f*fabsf(deltaX));
if (deltaX < 0) scaleFactor = 1.0f/scaleFactor;
camera.zoom = Clamp(camera.zoom*scaleFactor, 0.125f, 64.0f);
}
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginMode2D(camera);
// Draw the 3d grid, rotated 90 degrees and centered around 0,0
// just so we have something in the XY plane
rlPushMatrix();
rlTranslatef(0, 25*50, 0);
rlRotatef(90, 1, 0, 0);
DrawGrid(100, 50);
rlPopMatrix();
// Draw a reference circle
DrawCircle(GetScreenWidth()/2, GetScreenHeight()/2, 50, MAROON);
EndMode2D();
DrawText("[1][2] Select mouse zoom mode (Wheel or Move)", 20, 20, 20, DARKGRAY);
if (zoomMode == 0) DrawText("Mouse right button drag to move, mouse wheel to zoom", 20, 50, 20, DARKGRAY);
else DrawText("Mouse right button drag to move, mouse press and move to zoom", 20, 50, 20, DARKGRAY);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
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