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const std = @import("std");
const math = @import("math.zig");
const config = @import("config.zig");
const c = @import("c.zig").c;
const Vec2f = math.Vec2f;
const Config = config.Config;
pub const Camera = struct {
position: Vec2f = .{},
velocity: Vec2f = .{},
scale: f32 = 1.0,
delta_scale: f32 = 0.0,
scale_pivot: Vec2f = .{},
};
pub const Mouse = struct {
curr: Vec2f = .{},
prev: Vec2f = .{},
drag: bool = false,
};
pub const Flashlight = struct {
enabled: bool = false,
shadow: f32 = 0.0,
radius: f32 = 0.0,
delta_radius: f32 = 0.0,
};
pub const State = struct {
camera: Camera = .{},
mouse: Mouse = .{},
flashlight: Flashlight = .{},
dt: f32 = 0.0,
running: bool = true,
mirror: bool = false,
};
pub const App = struct {
config: Config = Config.default(),
state: State = .{},
config_path: ?[]const u8 = null,
allocator: std.mem.Allocator,
pub fn init(alloc: std.mem.Allocator, cfg_path: ?[]const u8) !App {
var app = App{
.allocator = alloc,
.config = Config.default(),
};
if (cfg_path) |p| {
app.config_path = try alloc.dupe(u8, p);
app.config.loadFromFile(p);
}
app.state.flashlight.radius = app.config.initial_radius;
return app;
}
pub fn deinit(self: *App) void {
if (self.config_path) |p| {
self.allocator.free(p);
}
}
pub fn cameraUpdate(self: *App, ws: Vec2f) void {
const cfg = &self.config;
const cam = &self.state.camera;
const m = &self.state.mouse;
const dt = self.state.dt;
if (@abs(cam.delta_scale) > cfg.scale_change_threshold) {
const half = ws.mul(0.5);
const sub = cam.scale_pivot.sub(half);
const p0 = sub.div(cam.scale);
cam.scale += cam.delta_scale * dt;
if (cam.scale < cfg.min_scale) cam.scale = cfg.min_scale;
const p1 = sub.div(cam.scale);
cam.position = cam.position.add(p0.sub(p1));
cam.delta_scale -= cam.delta_scale * dt * cfg.scale_friction;
}
if (!m.drag and cam.velocity.length() > cfg.velocity_threshold) {
cam.position = cam.position.add(cam.velocity.mul(dt));
cam.velocity = cam.velocity.sub(cam.velocity.mul(dt * cfg.drag_friction));
}
}
pub fn flashlightUpdate(self: *App) void {
const fl = &self.state.flashlight;
const dt = self.state.dt;
const cfg = &self.config;
fl.shadow = if (fl.enabled)
@min(fl.shadow + cfg.fade_speed * dt, cfg.max_shadow_opacity)
else
@max(fl.shadow - cfg.fade_speed * dt, 0.0);
if (@abs(fl.delta_radius) > cfg.radius_change_threshold) {
fl.radius = @max(0.0, fl.radius + fl.delta_radius * dt);
fl.delta_radius -= fl.delta_radius * cfg.radius_damping * dt;
}
}
fn worldPosition(camera: *Camera, pos: Vec2f) Vec2f {
return pos.div(camera.scale);
}
pub fn processEvents(self: *App, x11: anytype) void {
var ev: c.XEvent = undefined;
while (c.XPending(x11.display) != 0) {
_ = c.XNextEvent(x11.display, &ev);
switch (ev.type) {
c.KeyPress => self.handleKeypress(&ev.xkey),
c.MotionNotify => self.handleMousemove(&ev.xmotion, x11.refresh_rate),
c.ButtonPress => self.handleButtonpress(&ev.xbutton),
c.ButtonRelease => self.handleButtonrelease(&ev.xbutton),
c.ClientMessage => {
if (@as(c.Atom, @bitCast(ev.xclient.data.l[0])) == x11.wm_delete_window)
self.state.running = false;
},
else => {},
}
}
}
fn handleKeypress(self: *App, ke: *c.XKeyEvent) void {
const key = c.XLookupKeysym(ke, 0);
if (key == self.config.key_escape or key == c.XK_q)
self.state.running = false;
if (key == c.XK_r) {
if (self.config_path) |p| {
self.config.loadFromFile(p);
}
}
if (key == self.config.key_flashlight)
self.state.flashlight.enabled = !self.state.flashlight.enabled;
if (key == self.config.key_reset) {
self.state.camera = .{ .scale = 1.0 };
self.state.flashlight.shadow = 0.0;
self.state.flashlight.radius = self.config.initial_radius;
self.state.flashlight.delta_radius = 0.0;
}
if (key == self.config.key_mirror)
self.state.mirror = !self.state.mirror;
if (key == self.config.key_zoom_in) {
self.state.camera.delta_scale += self.config.scroll_speed;
self.state.camera.scale_pivot = self.state.mouse.curr;
}
if (key == self.config.key_zoom_out) {
self.state.camera.delta_scale -= self.config.scroll_speed;
self.state.camera.scale_pivot = self.state.mouse.curr;
}
}
fn handleMousemove(self: *App, motion: *c.XMotionEvent, rr: i32) void {
self.state.mouse.curr = .{ .x = @floatFromInt(motion.x), .y = @floatFromInt(motion.y) };
if (self.state.mouse.drag) {
const prev = worldPosition(&self.state.camera, self.state.mouse.prev);
const cur = worldPosition(&self.state.camera, self.state.mouse.curr);
self.state.camera.position = self.state.camera.position.add(prev.sub(cur));
self.state.camera.velocity = prev.sub(cur).mul(@floatFromInt(rr));
}
self.state.mouse.prev = self.state.mouse.curr;
}
fn handleButtonpress(self: *App, be: *c.XButtonEvent) void {
const ctrl_pressed = (be.state & self.config.modifier_flashlight) != 0;
if (be.button == self.config.button_drag) {
self.state.mouse.prev = self.state.mouse.curr;
self.state.mouse.drag = true;
self.state.camera.velocity = .{};
} else if (be.button == self.config.button_zoom_in) {
if (ctrl_pressed and self.state.flashlight.enabled) {
self.state.flashlight.delta_radius += self.config.initial_delta_radius;
} else {
self.state.camera.delta_scale += self.config.scroll_speed;
self.state.camera.scale_pivot = self.state.mouse.curr;
}
} else if (be.button == self.config.button_zoom_out) {
if (ctrl_pressed and self.state.flashlight.enabled) {
self.state.flashlight.delta_radius -= self.config.initial_delta_radius;
} else {
self.state.camera.delta_scale -= self.config.scroll_speed;
self.state.camera.scale_pivot = self.state.mouse.curr;
}
}
}
fn handleButtonrelease(self: *App, be: *c.XButtonEvent) void {
if (be.button == self.config.button_drag)
self.state.mouse.drag = false;
}
};
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