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import h from '../Util/DomUtil.js';
import { dist, AABB, QuadTree } from '../Geometry/Geometry.js';
import { Shape } from './Shapes.js';
class Transform {
constructor() {
this.scale = 1;
this.pan = {
x: 0,
y: 0,
};
}
screenToDrawing(x, y) {
return [
(this.scale * x) - this.pan.x,
(this.scale * y) - this.pan.y,
];
}
drawingToScreen(x, y) {
return [
(x + this.pan.x) / this.scale,
(y + this.pan.y) / this.scale,
];
}
}
class Mouse {
constructor(canvas) {
this.position = { x: 0, y: 0 };
this.onMouseMove = null;
this.onClick = null;
canvas.addEventListener('mousemove', e => {
this.position.x = e.offsetX;
this.position.y = e.offsetY;
if (this.onMouseMove) this.onMouseMove();
});
canvas.addEventListener('click', e => {
if (this.onClick) this.onClick();
});
}
getPosition(transform) {
const { x, y } = this.position;
return transform.screenToDrawing(x, y);
}
}
class Canvas {
constructor(parentId) {
const parentElement = document.getElementById(parentId);
this.canvas = h('canvas',
{
width: parentElement.clientWidth,
height: parentElement.clientHeight
}
);
this.context = this.canvas.getContext('2d');
parentElement.appendChild(this.canvas);
}
/* ~~~~~~~~~~~~~~~~ drawing ~~~~~~~~~~~~~~~~ */
render(transform, shapes) {
this.context.save();
this.context.setTransform(1, 0, 0, 1, 0, 0);
this.context.scale(transform.scale, transform.scale);
this.context.translate(transform.pan.x, transform.pan.y);
for (let shape of shapes) {
switch(shape.type) {
case Shape.Point:
this.drawPoint(shape);
break;
case Shape.Path:
this.drawPath(shape);
break;
case Shape.Polygon:
this.drawPolygon(shape);
break;
case Shape.Text:
this.drawText(shape);
break;
default:
break;
}
}
this.context.restore();
}
drawPoint(shape) {
const ct = this.context;
ct.beginPath();
ct.arc(shape.nodes[0].x, shape.nodes[0].y, 2, 0, 2*Math.PI);
ct.closePath();
ct.fill();
}
drawPath(shape) {
const ct = this.context;
ct.beginPath();
ct.moveTo(shape.nodes[0].x, shape.nodes[0].y);
for(let point of shape.nodes.slice(1)) {
ct.lineTo(point.x, point.y);
}
ct.stroke();
ct.closePath();
}
drawPolygon(shape) {
const ct = this.context;
ct.beginPath();
ct.moveTo(shape.nodes[0].x, shape.nodes[0].y);
for (let point of shape.nodes.slice(1)) {
ct.lineTo(point.x, point.y);
}
ct.closePath();
ct.stroke();
ct.fill();
}
drawText(shape) {
console.log('yes');
const ct = this.context;
ct.fillText(shape.text, shape.nodes[0].x, shape.nodes[0].y);
}
}
export { Transform, Mouse, Canvas };
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