rayjs/examples/2d_camera_mouse_zoom.js

87 lines
3.1 KiB
JavaScript

import * as rl from "raylib"
for (const key in rl) {
globalThis[key] = rl[key]
}
// Initialization
//--------------------------------------------------------------------------------------
const screenWidth = 800;
const screenHeight = 450;
initWindow(screenWidth, screenHeight, "raylib [core] example - 2d camera mouse zoom");
const camera = new Camera2D(new Vector2(), new Vector2(), 0, 1);
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
//----------------------------------------------------------------------------------
// Translate based on mouse right click
if (isMouseButtonDown(MOUSE_BUTTON_RIGHT))
{
let delta = getMouseDelta();
delta = vector2Scale(delta, -1.0/camera.zoom);
camera.target = vector2Add(camera.target, delta);
}
// Zoom based on mouse wheel
let wheel = getMouseWheelMove();
if (wheel != 0)
{
// Get the world point that is under the mouse
const 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
const zoomIncrement = 0.125;
camera.zoom += (wheel*zoomIncrement);
if (camera.zoom < zoomIncrement) camera.zoom = zoomIncrement;
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
beginDrawing();
clearBackground(BLACK);
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(100, 100, 50, YELLOW);
endMode2D();
drawText("Mouse right button drag to move, mouse wheel to zoom", 10, 10, 20, WHITE);
endDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
closeWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------