Reviewed example formating
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*
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*
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* raylib [core] example - 2d camera mouse zoom
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* raylib [core] example - 2d camera mouse zoom
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*
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*
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* This example has been created using raylib 1.5 (www.raylib.com)
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* This example was originally created with raylib 4.2, last time updated for raylib 4.2
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*
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* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
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* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
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*
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*
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* Copyright (c) 2022 Jeffery Myers
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* Copyright (c) 2022 Jeffery Myers
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*
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*
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********************************************************************************************/
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********************************************************************************************/
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#include "raylib.h"
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#include "raylib.h"
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#include "rlgl.h"
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#include "raymath.h";
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#include "rlgl.h"
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#include "raymath.h"
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//------------------------------------------------------------------------------------
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//------------------------------------------------------------------------------------
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// Program main entry point
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// Program main entry point
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@ -28,42 +28,44 @@ int main ()
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InitWindow(screenWidth, screenHeight, "raylib [core] example - 2d camera mouse zoom");
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InitWindow(screenWidth, screenHeight, "raylib [core] example - 2d camera mouse zoom");
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Camera2D camera = { 0 };
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Camera2D camera = { 0 };
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camera.zoom = 1;
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camera.zoom = 1.0f;
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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//--------------------------------------------------------------------------------------
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//--------------------------------------------------------------------------------------
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// Main game loop
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// Main game loop
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while (!WindowShouldClose())
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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{
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// translate based on right click
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// Update
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//----------------------------------------------------------------------------------
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// Translate based on mouse right click
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if (IsMouseButtonDown(MOUSE_BUTTON_RIGHT))
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if (IsMouseButtonDown(MOUSE_BUTTON_RIGHT))
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{
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{
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Vector2 delta = GetMouseDelta();
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Vector2 delta = GetMouseDelta();
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delta = Vector2Scale(delta, -1.0f / camera.zoom);
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delta = Vector2Scale(delta, -1.0f/camera.zoom);
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camera.target = Vector2Add(camera.target, delta);
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camera.target = Vector2Add(camera.target, delta);
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}
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}
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// zoom based on wheel
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// Zoom based on mouse wheel
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float wheel = GetMouseWheelMove();
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float wheel = GetMouseWheelMove();
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if (wheel != 0)
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if (wheel != 0)
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{
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{
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// get the world point that is under the mouse
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// Get the world point that is under the mouse
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Vector2 mouseWorldPos = GetScreenToWorld2D(GetMousePosition(), camera);
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Vector2 mouseWorldPos = GetScreenToWorld2D(GetMousePosition(), camera);
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// set the offset to where the mouse is
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// Set the offset to where the mouse is
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camera.offset = GetMousePosition();
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camera.offset = GetMousePosition();
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// 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
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// Set the target to match, so that the camera maps the world space point
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// under the cursor to the screen space point under the cursor at any zoom
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camera.target = mouseWorldPos;
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camera.target = mouseWorldPos;
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// zoom
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// Zoom increment
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const float zoomIncrement = 0.125f;
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const float zoomIncrement = 0.125f;
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camera.zoom += wheel * zoomIncrement;
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camera.zoom += (wheel*zoomIncrement);
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if (camera.zoom < zoomIncrement)
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if (camera.zoom < zoomIncrement) camera.zoom = zoomIncrement;
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camera.zoom = zoomIncrement;
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}
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}
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//----------------------------------------------------------------------------------
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//----------------------------------------------------------------------------------
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// Draw
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// Draw
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//----------------------------------------------------------------------------------
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//----------------------------------------------------------------------------------
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BeginDrawing();
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BeginDrawing();
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BeginDrawing();
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ClearBackground(BLACK);
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ClearBackground(BLACK);
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BeginMode2D(camera);
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BeginMode2D(camera);
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// draw the 3d grid, rotated 90 degrees and centered around 0,0 just so we have something in the XY plane
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// Draw the 3d grid, rotated 90 degrees and centered around 0,0
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// just so we have something in the XY plane
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rlPushMatrix();
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rlPushMatrix();
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rlTranslatef(0, 25 * 50, 0);
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rlTranslatef(0, 25*50, 0);
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rlRotatef(90, 1, 0, 0);
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rlRotatef(90, 1, 0, 0);
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DrawGrid(100, 50);
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DrawGrid(100, 50);
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rlPopMatrix();
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rlPopMatrix();
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// draw a thing
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// Draw a reference circle
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DrawCircle(100, 100, 50, YELLOW);
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DrawCircle(100, 100, 50, YELLOW);
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EndMode2D();
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EndMode2D();
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DrawText("Right drag to move, mouse wheel to zoom", 2, 2, 20, WHITE);
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DrawText("Mouse right button drag to move, mouse wheel to zoom", 10, 10, 20, WHITE);
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EndDrawing();
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EndDrawing();
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//----------------------------------------------------------------------------------
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//----------------------------------------------------------------------------------
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BIN
examples/core/core_2d_camera_mouse_zoom.png
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BIN
examples/core/core_2d_camera_mouse_zoom.png
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