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const DEFAULT_APP_STATE = {
floor: 1,
plan: new Array(GRID_SIZE_X * GRID_SIZE_Y).fill(0),
// mouse_state can be “normal”, or “dnd”.
mouse_state: "normal",
};
function genGrid(x_count, y_count, cell_size)
{
let lines = [];
for(let x = 0; x < x_count+1; x++)
{
lines.push(h("line", {
"x1": x * cell_size + 0.5, "x2": x * cell_size + 0.5, "y1": 0.5,
"y2": y_count * cell_size + 0.5,
}));
}
for(let y = 0; y < y_count+1; y++)
{
lines.push(h("line", {
"y1": y * cell_size + 0.5, "y2": y * cell_size + 0.5, "x1": 0.5,
"x2": x_count * cell_size + 0.5,
}));
}
return h("g", {"stroke": "black", "stroke-width": 1}, lines);
}
function AssetView({asset_index, on_drag_begin, on_drag_end})
{
return h("div", {"class": "Asset", "draggable": true,
"data-asset-index": asset_index,
"ondragstart": on_drag_begin,
"ondragend": on_drag_end,},
h("svg", ASSET_SVG_PROPS, ASSET_WHITE_BG,
TILES[asset_index].inner_svg));
}
function AssetsView({on_drag_begin, on_drag_end})
{
let views = TILES.slice(1).map((t, i) =>
h(AssetView, {asset_index: i + 1, on_drag_begin: on_drag_begin,
on_drag_end: on_drag_end}));
return h("div", {}, views);
}
function PlanGridView({content, mouse_state})
{
const [mouse_coord, setMouseCoord] = preactHooks.useState(null);
function onDragOver(e)
{
e.preventDefault();
let b = e.target.getBoundingClientRect();
let x = e.clientX - b.left;
let y = e.clientY - b.top;
setMouseCoord([x, y]);
}
function onDragLeave(e)
{
setMouseCoord(null);
}
let hilight_box = null;
console.debug(mouse_coord);
if(mouse_coord !== null && mouse_state != "dnd")
{
setMouseCoord(null);
}
if(mouse_coord !== null && mouse_state == "dnd")
{
let cell_x = Math.floor(mouse_coord[0] / (CELL_SIZE + 1));
let cell_y = Math.floor(mouse_coord[1] / (CELL_SIZE + 1));
hilight_box = h("rect", {
"x": cell_x * (CELL_SIZE + 1) + 0.5, "y": cell_y * (CELL_SIZE + 1) + 0.5,
"width": CELL_SIZE + 1, "height": CELL_SIZE + 1,
"stroke": "#2ed573", "stroke-width": 3, "fill": "transparent"});
}
let grid_content = content.map((idx, i) => {
if(idx == 0) return null;
let cell_x = i % GRID_SIZE_X;
let cell_y = Math.floor(i / GRID_SIZE_Y);
return h("g", {"transform": `translate(${cell_x * (CELL_SIZE + 1) + 1} \
${cell_y * (CELL_SIZE + 1) + 1})`}, ASSET_WHITE_BG, TILES[idx].inner_svg);
});
let img_width = GRID_SIZE_X * (CELL_SIZE + 1) + 1;
let img_height = GRID_SIZE_Y * (CELL_SIZE + 1) + 1;
return h("svg", {"width": img_width, "height": img_height,
"version": "1.1", "ondragover": onDragOver,
"id": "Grid", "ondragleave": onDragLeave,},
h("rect", {x: 0, y: 0, width: img_width, height: img_height,
fill: "#a4b0be", "stroke-width": 0}),
grid_content, genGrid(GRID_SIZE_X, GRID_SIZE_Y, CELL_SIZE + 1),
hilight_box);
}
function PlanView({plan, mouse_state})
{
return h("div", {},
h("p", {}, "The plan:"),
h(PlanGridView, {content: plan, mouse_state: mouse_state}));
}
function App({initial_state})
{
const [state, setState] = preactHooks.useState(initial_state);
function onDragAssetBegin(e)
{
let new_state = structuredClone(state);
new_state.mouse_state = "dnd";
setState(new_state);
}
function onDragAssetEnd(e)
{
if(e.dragEffect === "none") return;
let grid = document.getElementById("Grid");
let b = grid.getBoundingClientRect();
let x = e.clientX - b.left;
let y = e.clientY - b.top;
if(x < 0 || y < 0 || x > b.width || y > b.height) return;
let cell_x = Math.floor(x / (CELL_SIZE + 1));
let cell_y = Math.floor(y / (CELL_SIZE + 1));
let cell_index = cell_y * GRID_SIZE_X + cell_x;
let asset_index = parseInt(e.target.getAttribute("data-asset-index"));
let new_state = structuredClone(state);
new_state.plan[cell_index] = asset_index;
new_state.mouse_state = "normal";
setState(new_state);
}
function onClickSaveImg()
{
let grid_width = GRID_SIZE_X * (CELL_SIZE + 1) + 1;
let grid_height = GRID_SIZE_Y * (CELL_SIZE + 1) + 1;
let canvas = document.createElement('canvas');
canvas.width = grid_width;
canvas.height = grid_height;
let context = canvas.getContext("2d");
var svg_str = new XMLSerializer().serializeToString(
document.getElementById("Grid"));
var img = new Image();
img.onload = function()
{
context.drawImage(this, 0, 0);
// Open PNG image in new tab.
var dataURL = canvas.toDataURL("image/png");
var new_tab = window.open('about:blank', 'image from canvas');
new_tab.document.write("<img src='" + dataURL + "' alt='from canvas'/>");
}
img.src = 'data:image/svg+xml; charset=utf8, ' +
encodeURIComponent(svg_str);
}
return h("div", {},
h(AssetsView, {on_drag_begin: onDragAssetBegin,
on_drag_end: onDragAssetEnd}),
h(PlanView, {plan: state.plan, mouse_state: state.mouse_state}),
h("div", {},
h("a", {"href": "javascript:void(0);", onclick: onClickSaveImg},
"Open Image!")));
}
preact.render(h(App, {initial_state: DEFAULT_APP_STATE}),
document.getElementById("Plan"));
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