tomo/ggfx
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Glaggle example draws glaggle as expected

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This commit is contained in:
Sasha Koshka 2023-07-01 04:01:03 -04:00
parent 5ca69d90e6
commit 1003203bb1
1 changed files with 27 additions and 12 deletions
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37
examples/glaggle/main.go
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@ -1,6 +1,7 @@
package main
import "os"
import "math"
import "image"
import "image/png"
import "git.tebibyte.media/tomo/ggfx"
@ -14,17 +15,20 @@ func main () {
Width: 4,
}
black := []uint8 { 0, 0, 0, 255 }
red := []uint8 { 255, 0, 0, 255 }
canvas.FillPolygon (
black,
image.Pt(10, 10),
image.Pt(70, 50),
image.Pt(20, 70))
canvas.StrokePolygon (
red, 1,
image.Pt(10, 10),
image.Pt(70, 50),
image.Pt(20, 70))
yellow := []uint8 { 255, 255, 0, 255 }
midpoint := image.Pt(canvas.Bounds.Dx() / 2, canvas.Bounds.Dy() / 2)
face := circle(32, 100, midpoint)
canvas.FillPolygon(yellow, face...)
canvas.StrokePolygon(black, 2, face...)
eye := circle(12, 16, midpoint.Add(image.Pt(-40, -30)))
canvas.FillPolygon(black, eye...)
eye = circle(12, 16, midpoint.Add(image.Pt(40, -30)))
canvas.FillPolygon(black, eye...)
mouth := circle(16, 70, midpoint)
canvas.StrokePolygon(black, 2, mouth[1:8]...)
file, err := os.Create("TEST.png")
if err != nil { panic(err.Error()) }
@ -35,3 +39,14 @@ func main () {
println("Open TEST.png to see the result.")
}
func circle (resolution int, radius float64, center image.Point) []image.Point {
points := make([]image.Point, resolution)
for index := range points {
angle := float64(index) * ((2 * math.Pi) / float64(len(points)))
point := image.Pt (
int(math.Cos(angle) * radius),
int(math.Sin(angle) * radius))
points[index] = point.Add(center)
}
return points
}