func (f *Font) Printf(format string, argv ...interface{}) (*shapes.Group, error) {
text := shapes.NewGroup()
str := fmt.Sprintf(format, argv...)
indices := []rune(str)
if len(indices) == 0 {
return nil, nil
}
// Runes form display list indices.
// For this purpose, they need to be offset by -FontConfig.Low
low := f.config.Low
x, y := float32(0), float32(0)
tw, th := f.Metrics(str)
for i := range indices {
id := indices[i] - low
letter := f.listbase[id].Clone()
letter.MoveTo(x, y)
text.Append(letter)
adv := f.config.Glyphs[id].Advance
x += float32(adv)
}
// Recalculate the center of the text group
verts := text.Vertices()
text.SetCenter(verts[0]+float32(tw/2), verts[1]+float32(th/2))
return text, nil
}
func (t *TestSuite) TestGroup() {
filename := "expected_group.png"
t.rlControl.drawFunc <- func() {
w, h := t.renderState.window.GetSize()
world := newWorld(w, h)
// Create first group, 2 small boxes
group1 := shapes.NewGroup()
b1 := shapes.NewBox(t.renderState.boxProgram, 20, 20)
b1.MoveTo(30, 40)
b2 := shapes.NewBox(t.renderState.boxProgram, 50, 50)
b2.MoveTo(45, -25)
b2.Rotate(20.0)
group1.Append(b1)
group1.Append(b2)
// Create the main group
group := shapes.NewGroup()
group.Append(group1)
group.Append(shapes.NewBox(t.renderState.boxProgram, 100, 100))
// Get the second element of the group
b3 := group.GetAt(1)
b3.MoveTo(float32(w/2), 0)
group.AttachToWorld(world)
gl.Clear(gl.COLOR_BUFFER_BIT)
group.Draw()
t.testDraw <- testlib.Screenshot(t.renderState.window)
t.renderState.window.SwapBuffers()
}
distance, exp, act, err := testlib.TestImage(filename, <-t.testDraw, imagetest.Center)
if err != nil {
panic(err)
}
t.True(distance < distanceThreshold, distanceError(distance, filename))
if t.Failed() {
saveExpAct(t.outputPath, "failed_"+filename, exp, act)
}
}