// main creates a new scene with a camera and 3 vectors, renders the scene,
// draws the result to an image and encodes the image as PNG into a file.
// Optionally specify the filename.
func main() {
var filename = flag.String("file", "triangle.png", "Filename to store image")
flag.Parse()
cam := render.NewDefCam()
v1 := geom.NewVec4(-1, -1, -3)
v2 := geom.NewVec4(0, 1, -5)
v3 := geom.NewVec4(1, -1, -3)
t := cam.PerspTransf(500, 500)
w1 := t.Transf(v1)
w1.Norm()
w2 := t.Transf(v2)
w2.Norm()
w3 := t.Transf(v3)
w3.Norm()
x1 := tmath.Round(w1[0])
y1 := tmath.Round(w1[1])
x2 := tmath.Round(w2[0])
y2 := tmath.Round(w2[1])
x3 := tmath.Round(w3[0])
y3 := tmath.Round(w3[1])
img := image.NewImage(500, 500)
col := color.RGBA{255, 255, 0, 255}
img.DrawDot(x1, y1, col)
img.DrawDot(x2, y2, col)
img.DrawDot(x3, y3, col)
img.DrawLine(x1, y1, x2, y2, col)
img.DrawLine(x2, y2, x3, y3, col)
img.DrawLine(x3, y3, x1, y1, col)
file, err := os.Create(*filename)
if err != nil {
panic(err)
}
defer file.Close()
img.WritePng(file)
}
// main creates a new scene with a camera and a triangle, renders the scene,
// draws the result to a window and displays it. The middle point of the
// triangle continuously changes position relative to the current time.
func main() {
win, err := window.NewWindow(1024, 768, "Three Render 2", true)
if err != nil {
panic(err)
}
defer window.Terminate()
cam := render.NewDefCam()
p := geom.NewTri4(-1, 0, -3, 0, 1, -3, 1, 0, -3)
for close := false; !close; close = win.ShouldClose() {
now := time.Now()
m := &p[1][1]
*m = math.Sin(float64(now.UnixNano()) / 1e9)
c := &cam.At[0]
*c = math.Cos(float64(now.UnixNano()) / 1e9)
cam.Ar = float64(win.Width()) / float64(win.Height())
t := cam.PerspTransf(win.Width(), win.Height())
q := p.Transf(t)
win.Clear()
q.Draw(win)
win.Update()
}
}
// main creates a new scene with a camera and a triangle, renders the scene,
// draws the result to a window and displays it. The middle point of the
// triangle continuously changes position relative to the current time.
func main() {
win, err := window.NewWindow(1024, 768, "Three Move", true)
if err != nil {
panic(err)
}
defer window.Terminate()
cam := render.NewDefCam()
p := geom.NewTri4(-1, 0, -3, 0, 1, -3, 1, 0, -3)
then := time.Now()
now := time.Now()
for close := false; !close; close = win.ShouldClose() || win.KeyDown(window.KeyQ) {
then = now
now = time.Now()
dt := now.Sub(then)
d := mgeom.Vec3{0, 0, 0}
if win.KeyDown(window.KeyW) {
d.Add(&cam.At)
}
if win.KeyDown(window.KeyS) {
d.Sub(&cam.At)
}
if win.KeyDown(window.KeyA) {
d.Add(mgeom.Cross(&cam.At, &cam.Up))
}
if win.KeyDown(window.KeyD) {
d.Add(mgeom.Cross(&cam.Up, &cam.At))
}
d.Norm()
d.Scale(dt.Seconds())
cam.Eye.Add(&d)
cam.Ar = float64(win.Width()) / float64(win.Height())
t := cam.PerspTransf(win.Width(), win.Height())
q := p.Transf(t)
win.Clear()
q.Draw(win)
win.Update()
}
}
