Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

menu: faster background drawing using FastHLines #6

Open
wants to merge 1 commit into
base: main
Choose a base branch
from
Open

menu: faster background drawing using FastHLines #6

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
81 changes: 75 additions & 6 deletions menu.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,75 @@ import (
"tinygo.org/x/tinyfont/proggy"
)

// FilledTriangle draws a filled triangle given three points
// Code from tinydraw, but faster and may not work on all displays
func FilledTriangle(x0 int16, y0 int16, x1 int16, y1 int16, x2 int16, y2 int16, color color.RGBA) {
if y0 > y1 {
x0, y0, x1, y1 = x1, y1, x0, y0
}
if y1 > y2 {
x1, y1, x2, y2 = x2, y2, x1, y1
}
if y0 > y1 {
x0, y0, x1, y1 = x1, y1, x0, y0
}

if y0 == y2 { // y0 = y1 = y2 : it's a line
a := x0
b := x0
if x1 < a {
a = x1
} else if x1 > b {
b = x1
}
if x2 < a {
a = x2
} else if x2 > b {
b = x2
}
// Line(display, a, y0, b, y0, color)
display.DrawFastHLine(a, b, y0, color)
return
}

dx01 := x1 - x0
dy01 := y1 - y0
dx02 := x2 - x0
dy02 := y2 - y0
dx12 := x2 - x1
dy12 := y2 - y1

sa := int16(0)
sb := int16(0)
a := int16(0)
b := int16(0)

last := y1 - 1
if y1 == y2 {
last = y1
}

y := y0
for ; y <= last; y++ {
a = x0 + sa/dy01
b = x0 + sb/dy02
sa += dx01
sb += dx02
display.DrawFastHLine(a, b, y, color)
}

sa = dx12 * (y - y1)
sb = dx02 * (y - y0)

for ; y <= y2; y++ {
a = x1 + sa/dy12
b = x0 + sb/dy02
sa += dx12
sb += dx02
display.DrawFastHLine(a, b, y, color)
}
}

func menu() int16 {
display.FillScreen(color.RGBA{0, 0, 0, 255})
options := []string{
Expand All @@ -23,12 +92,12 @@ func menu() int16 {

bgColor := color.RGBA{0, 40, 70, 255}
display.FillScreen(bgColor)
tinydraw.FilledTriangle(&display, 0, 128, 0, 45, 45, 0, color.RGBA{255, 255, 255, 255})
tinydraw.FilledTriangle(&display, 45, 0, 0, 128, 145, 0, color.RGBA{255, 255, 255, 255})
tinydraw.FilledTriangle(&display, 0, 128, 15, 128, 145, 0, color.RGBA{255, 255, 255, 255})
for i := int16(0); i < 8; i++ {
tinydraw.Line(&display, 0, 110+i, 110+i, 0, bgColor)
}
FilledTriangle(0, 128, 0, 45, 45, 0, color.RGBA{255, 255, 255, 255})
FilledTriangle(45, 0, 0, 128, 145, 0, color.RGBA{255, 255, 255, 255})
FilledTriangle(0, 128, 15, 128, 145, 0, color.RGBA{255, 255, 255, 255})

FilledTriangle(0, 110, 110, 0, 117, 0, bgColor)
FilledTriangle(0, 110, 0, 117, 117, 0, bgColor)

selected := int16(0)
numOpts := int16(len(options))
Expand Down