Reference · Surface maze rules and geometry
trackballPointfunction
The point of the trackball a point of the picture is on, for turning by a drag: the unit sphere seen from the front, and, outside it, the rim.
Import it
import { trackballPoint } from "@johnmorrisdotca/meikyuu/3d";Definition
function trackballPoint(frame: SolidFrame, x: number, y: number): Vec3Parameters
| Name | Type | Description |
|---|---|---|
frame | SolidFrame | The current projected surface-view arrays and dimensions. |
x | number | The horizontal viewport coordinate. |
y | number | The vertical viewport coordinate. |
Returns
Vec3
The point of the trackball a point of the picture is on, for turning by a drag: the unit sphere seen from the front, and, outside it, the rim.
Examples
import type { MazeRecipe } from "@johnmorrisdotca/meikyuu";
import { buildMaze } from "@johnmorrisdotca/meikyuu";
import type { Quat, SolidRecipe } from "@johnmorrisdotca/meikyuu/3d";
import { buildSolidMaze, createFrame, projectFrame, trackballPoint } 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(trackballPoint(frame,320,240));[ 0, 0, 1 ]What it prints (run when this page was built)