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const std = @import("std");
const rl = @cImport(@cInclude("raylib.h"));
const context = @import("context.zig");
const grid_size: usize = 21;
const grid_central_row = grid_size / 2 + 1;
pub const MyRect = struct {
rect: rl.Rectangle,
color: rl.Color,
};
const hex_radius: f32 = 100.0;
const hex_rotation = 30.0;
pub const HexCoord = struct {
q: i32,
r: i32,
pub inline fn fracS(q: f32, r: f32) f32 {
return -q - r;
}
pub inline fn index(self: HexCoord) usize {
return self.r / grid_size + self.q % grid_size;
}
pub inline fn qrToWorld(q: i32, r: i32) rl.Vector2 {
return .{
.x = hex_radius * (@sqrt(3.0) * @as(f32, @floatFromInt(q)) + @sqrt(3.0) / 2.0 * @as(f32, @floatFromInt(r))),
.y = hex_radius * (3.0 / 2.0 * @as(f32, @floatFromInt(r))),
};
}
pub inline fn worldToQr(point: rl.Vector2) HexCoord {
const q = (@sqrt(3.0) / 3.0 * point.x - 1.0 / 3.0 * point.y) / hex_radius;
const r = (2.0 / 3.0 * point.y) / hex_radius;
return axialRound(.{ .x = q, .y = r });
}
pub inline fn axialRound(frac: rl.Vector2) HexCoord {
return cubeRound(rl.Vector3{ .x = frac.x, .y = frac.y, .z = fracS(frac.x, frac.y) });
}
pub inline fn cubeRound(frac: rl.Vector3) HexCoord {
var q = @round(frac.x);
var r = @round(frac.y);
var s = @round(frac.z);
const q_diff = @abs(q - frac.x);
const r_diff = @abs(r - frac.y);
const s_diff = @abs(s - frac.z);
if (q_diff > r_diff and q_diff > s_diff) {
q = -r - s;
} else if (r_diff > s_diff) {
r = -q - s;
} else {
s = -q - r;
}
return .{
.q = @as(i32, @intFromFloat(q)),
.r = @as(i32, @intFromFloat(r)),
};
}
};
pub const Hex = struct {
// todo perhaps worth having a sentiental value somewhere to state if a hex is alive or perhaps make the list optinals?
color: rl.Color,
};
pub fn setup() !void {
const target = HexCoord.qrToWorld(grid_central_row, grid_central_row);
context.camera = rl.Camera2D{ .target = target, .offset = rl.Vector2{ .x = 0, .y = 0 }, .rotation = 0, .zoom = 1 };
context.hex_grid = try context.Grid.init(context.gpa, grid_size);
// TODO think what it means to populate a hex grid
for (0..grid_size) |_| {
for (0..grid_size) |_| {
try context.hex_grid.initPush(Hex{
// TODO real colors
.color = rl.DARKGREEN,
});
}
}
}
pub fn update() !void {
//----------------------------------------------------------------------------------
const mouse_pos = rl.GetMousePosition();
const mouse_world_pos = rl.GetScreenToWorld2D(mouse_pos, context.camera);
context.hovered_coords = HexCoord.worldToQr(mouse_world_pos);
const zoom_scale = context.camera.zoom;
if (rl.IsKeyDown(rl.KEY_D)) {
context.camera.target.x += 2 / zoom_scale;
}
if (rl.IsKeyDown(rl.KEY_A)) {
context.camera.target.x -= 2 / zoom_scale;
}
if (rl.IsKeyDown(rl.KEY_W)) {
context.camera.target.y -= 2 / zoom_scale;
}
if (rl.IsKeyDown(rl.KEY_S)) {
context.camera.target.y += 2 / zoom_scale;
}
if (rl.IsMouseButtonDown(rl.MOUSE_BUTTON_MIDDLE)) {
const delta = rl.GetMouseDelta();
context.camera.target.x -= delta.x / zoom_scale;
context.camera.target.y -= delta.y / zoom_scale;
}
const wm = rl.GetMouseWheelMove();
if (wm != 0.0) {
context.camera.zoom += wm * 0.05;
context.camera.target = mouse_world_pos;
context.camera.offset = mouse_pos;
if (context.camera.zoom > 3.0) context.camera.zoom = 3.0;
if (context.camera.zoom < 0.1) context.camera.zoom = 0.1;
}
}
pub fn draw() !void {
rl.BeginDrawing();
rl.ClearBackground(rl.SKYBLUE);
rl.BeginMode2D(context.camera);
const slice = context.hex_grid.buffer.slice();
const colors = slice.items(.color);
for (0..grid_size) |r| {
var start: usize = 0;
var end: usize = 0;
if (r < grid_central_row) {
start = grid_central_row - r;
end = grid_size;
} else {
start = 0;
end = grid_size - (r - grid_central_row);
}
for (start..end) |q| {
const idx = r * grid_size + q;
const center = HexCoord.qrToWorld(@intCast(q), @intCast(r));
rl.DrawPoly(center, 6, hex_radius, hex_rotation, colors[idx]);
rl.DrawPolyLines(center, 6, hex_radius, hex_rotation, rl.BLACK);
}
}
const center = HexCoord.qrToWorld(@intCast(context.hovered_coords.q), @intCast(context.hovered_coords.r));
rl.DrawPolyLines(center, 6, hex_radius, hex_rotation, rl.WHITE);
rl.EndMode2D();
rl.EndDrawing();
}
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