Reference · Surface maze rules and geometry
pickCellfunction
The cell the point (x, y) of the picture is on, or -1 for none. The point is on a cell when it is inside the outline the cell is drawn with;
a point on the line between two cells is on the lower numbered. Where outlines overlap (they do not on a convex solid, but a flattened globe's might at the very
edge, and a star, a cross or a heart has parts in front of parts) the cell nearest the viewer at that point wins.
Import it
import { pickCell } from "@johnmorrisdotca/meikyuu/3d";Definition
function pickCell(frame: SolidFrame, grid: SolidGrid, x: number, y: number): numberParameters
| Name | Type | Description |
|---|---|---|
frame | SolidFrame | The current projected surface-view arrays and dimensions. |
grid | SolidGrid | The valid native flat or surface cell graph. |
x | number | The horizontal viewport coordinate. |
y | number | The vertical viewport coordinate. |
Returns
number
The cell the point (x, y) of the picture is on, or -1 for none. The point is on a cell when it is inside the outline the cell is drawn with; a point on the line between two cells is on the lower numbered. Where outlines overlap (they do not on a convex solid, but a flattened globe's might at the very edge, and a star, a cross or a heart has parts in front of parts) the cell nearest the viewer at that point wins.
Examples
import type { MazeRecipe } from "@johnmorrisdotca/meikyuu";
import { buildMaze } from "@johnmorrisdotca/meikyuu";
import type { Quat, SolidRecipe } from "@johnmorrisdotca/meikyuu/3d";
import { buildSolidMaze, createFrame, pickCell, projectFrame } from "@johnmorrisdotca/meikyuu/3d";
const recipe: MazeRecipe = {shape:"square",w:5,h:5,algorithm:"backtracker",mode:"to-goal",seed:42};
const maze = buildMaze(recipe);
const grid = maze.grid;
const solidRecipe: SolidRecipe = {kind:"cube",n:2,algorithm:"backtracker",seed:42};
const solid = buildSolidMaze(solidRecipe);
const solidGrid = solid.grid;
const q: Quat = [0,0,0,1];
const frame = projectFrame(createFrame(solidGrid),solidGrid,q,1,640,480);
console.log(pickCell(frame,solidGrid,320,240));16What it prints (run when this page was built)