107 lines
3.7 KiB
JavaScript
107 lines
3.7 KiB
JavaScript
import { NS } from '../../../packages/svgcanvas/core/namespaces.js'
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import * as math from '../../../packages/svgcanvas/core/math.js'
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describe('math', function () {
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const svg = document.createElementNS(NS.SVG, 'svg')
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it('Test svgedit.math package', function () {
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assert.ok(math)
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assert.ok(math.transformPoint)
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assert.ok(math.isIdentity)
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assert.ok(math.matrixMultiply)
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assert.equal(typeof math.transformPoint, typeof function () { /* empty fn */ })
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assert.equal(typeof math.isIdentity, typeof function () { /* empty fn */ })
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assert.equal(typeof math.matrixMultiply, typeof function () { /* empty fn */ })
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})
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it('Test svgedit.math.transformPoint() function', function () {
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const { transformPoint } = math
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const m = svg.createSVGMatrix()
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m.a = 1; m.b = 0
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m.c = 0; m.d = 1
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m.e = 0; m.f = 0
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let pt = transformPoint(100, 200, m)
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assert.equal(pt.x, 100)
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assert.equal(pt.y, 200)
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m.e = 300; m.f = 400
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pt = transformPoint(100, 200, m)
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assert.equal(pt.x, 400)
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assert.equal(pt.y, 600)
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m.a = 0.5; m.b = 0.75
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m.c = 1.25; m.d = 2
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pt = transformPoint(100, 200, m)
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assert.equal(pt.x, 100 * m.a + 200 * m.c + m.e)
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assert.equal(pt.y, 100 * m.b + 200 * m.d + m.f)
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})
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it('Test svgedit.math.isIdentity() function', function () {
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assert.ok(math.isIdentity(svg.createSVGMatrix()))
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const m = svg.createSVGMatrix()
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m.a = 1; m.b = 0
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m.c = 0; m.d = 1
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m.e = 0; m.f = 0
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assert.ok(math.isIdentity(m))
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})
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it('Test svgedit.math.matrixMultiply() function', function () {
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const mult = math.matrixMultiply
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const { isIdentity } = math
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// translate there and back
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const tr1 = svg.createSVGMatrix().translate(100, 50)
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const tr2 = svg.createSVGMatrix().translate(-90, 0)
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const tr3 = svg.createSVGMatrix().translate(-10, -50)
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let I = mult(tr1, tr2, tr3)
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assert.ok(isIdentity(I), 'Expected identity matrix when translating there and back')
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// rotate there and back
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// TODO: currently Mozilla fails this when rotating back at -50 and then -40 degrees
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// (b and c are *almost* zero, but not zero)
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const rotThere = svg.createSVGMatrix().rotate(90)
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const rotBack = svg.createSVGMatrix().rotate(-90) // TODO: set this to -50
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const rotBackMore = svg.createSVGMatrix().rotate(0) // TODO: set this to -40
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I = mult(rotThere, rotBack, rotBackMore)
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assert.ok(isIdentity(I), 'Expected identity matrix when rotating there and back')
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// scale up and down
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const scaleUp = svg.createSVGMatrix().scale(4)
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const scaleDown = svg.createSVGMatrix().scaleNonUniform(0.25, 1)
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const scaleDownMore = svg.createSVGMatrix().scaleNonUniform(1, 0.25)
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I = mult(scaleUp, scaleDown, scaleDownMore)
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assert.ok(isIdentity(I), 'Expected identity matrix when scaling up and down')
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// test multiplication with its inverse
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I = mult(rotThere, rotThere.inverse())
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assert.ok(isIdentity(I), 'Expected identity matrix when multiplying a matrix by its inverse')
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I = mult(rotThere.inverse(), rotThere)
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assert.ok(isIdentity(I), 'Expected identity matrix when multiplying a matrix by its inverse')
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})
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it('Test svgedit.math.transformBox() function', function () {
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const { transformBox } = math
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const m = svg.createSVGMatrix()
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m.a = 1; m.b = 0
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m.c = 0; m.d = 1
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m.e = 0; m.f = 0
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const r = transformBox(10, 10, 200, 300, m)
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assert.equal(r.tl.x, 10)
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assert.equal(r.tl.y, 10)
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assert.equal(r.tr.x, 210)
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assert.equal(r.tr.y, 10)
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assert.equal(r.bl.x, 10)
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assert.equal(r.bl.y, 310)
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assert.equal(r.br.x, 210)
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assert.equal(r.br.y, 310)
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assert.equal(r.aabox.x, 10)
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assert.equal(r.aabox.y, 10)
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assert.equal(r.aabox.width, 200)
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assert.equal(r.aabox.height, 300)
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})
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})
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