Computer Graphics & Visualization @ufrj.br
Published
Edited
Apr 5, 2022
1 star
desenho = html`<svg width=600 height=400 style="border:1px solid gray" >`
S1 = ({
u0 : [60, 0, 0],
u1 : [15, 40, 0],
o : [40,100, 1]
})
M1 = [...S1.u0, ...S1.u1, ...S1.o]
M1Inv = mat3.invert([], M1)
mutable P = [100,200,1]
P_S1 = vec3.transformMat3([],P,M1Inv)
// Função para retornar a especificação de path (atributo d) de uma seta de p para q
function arrow (p,q) {
const u = vec2.scale([], vec2.normalize([], vec2.sub([], q, p)), 8);
const q1 = vec2.add ([], q, vec2.rotate([], u, [0,0], Math.PI*0.8));
const q2 = vec2.add ([], q, vec2.rotate([], u, [0,0], -Math.PI*0.8));
return `M ${p[0]},${p[1]} L${q[0]},${q[1]} m0,0 L${q1[0]},${q1[1]} L${q2[0]},${q2[1]} Z`
}
{
desenho.innerHTML = `
<path d="${arrow(S1.o, vec2.add([],S1.o, S1.u0))}" stroke=black />
<path d="${arrow(S1.o, vec2.add([],S1.o, S1.u1))}" stroke=black />
<circle cx=${S1.o[0]} cy=${S1.o[1]} r=5 />
<circle cx=${P[0]} cy=${P[1]} r=5 fill=blue />`;
for (let ix = 0; ix < 8; ix++) {
for (let iy = 0; iy < 8; iy++) {
let q = vec2.add([], S1.o,
vec2.add ([],
vec2.scale ([], S1.u0, ix),
vec2.scale ([], S1.u1, iy)));
desenho.append(svg`<circle cx=${q[0]} cy=${q[1]} r=1.5 fill=red >`)
}
}
let [x,y] = P_S1.map( _ => _.toFixed(2));
desenho.append (svg`<text x=${P[0]} y=${P[1]} dx=10 >(${x}, ${y})</text>` )
desenho.onclick = (e) => {
mutable P = [e.offsetX, e.offsetY, 1]
}
}
import {vec2, vec3, mat3 } from "@esperanc/vec2-utils"
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