Monorepo for Tangled
appview/ogcard: add utility to draw rounded rectangles
Signed-off-by: oppiliappan <me@oppi.li>
authored by
oppiliappan
and committed by
tangled.org
(Feb 6, 2026, 6:56 AM UTC)
0250a132
a5aa3f1e
+56
+56
appview/ogcard/card.go
+56
appview/ogcard/card.go
···
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return textWidth, err
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}
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+
func (c *Card) FontHeight(sizePt float64) int {
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ft := freetype.NewContext()
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ft.SetDPI(72)
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ft.SetFont(c.Font)
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ft.SetFontSize(sizePt)
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return ft.PointToFixed(sizePt).Ceil()
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}
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func (c *Card) TextWidth(text string, sizePt float64) int {
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face := truetype.NewFace(c.Font, &truetype.Options{Size: sizePt, DPI: 72})
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lineWidth := font.MeasureString(face, text)
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textWidth := lineWidth.Ceil()
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return textWidth
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}
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// DrawBoldText draws bold text by rendering multiple times with slight offsets
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func (c *Card) DrawBoldText(text string, x, y int, textColor color.Color, sizePt float64, valign VAlign, halign HAlign) (int, error) {
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// Draw the text multiple times with slight offsets to create bold effect
···
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func (c *Card) DrawRect(startX, startY, endX, endY int, color color.Color) {
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draw.Draw(c.Img, image.Rect(startX, startY, endX, endY), &image.Uniform{color}, image.Point{}, draw.Src)
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}
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// drawRoundedRect draws a filled rounded rectangle on the given card
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func (card *Card) DrawRoundedRect(x, y, width, height, cornerRadius int, fillColor color.RGBA) {
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cardBounds := card.Img.Bounds()
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for py := y; py < y+height; py++ {
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for px := x; px < x+width; px++ {
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// calculate distance from corners
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dx := 0
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dy := 0
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// check which corner region we're in
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if px < x+cornerRadius && py < y+cornerRadius {
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// top-left corner
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dx = x + cornerRadius - px
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dy = y + cornerRadius - py
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} else if px >= x+width-cornerRadius && py < y+cornerRadius {
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// top-right corner
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dx = px - (x + width - cornerRadius - 1)
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dy = y + cornerRadius - py
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} else if px < x+cornerRadius && py >= y+height-cornerRadius {
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// bottom-left corner
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dx = x + cornerRadius - px
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dy = py - (y + height - cornerRadius - 1)
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} else if px >= x+width-cornerRadius && py >= y+height-cornerRadius {
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// Bottom-right corner
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dx = px - (x + width - cornerRadius - 1)
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dy = py - (y + height - cornerRadius - 1)
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}
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// if we're in a corner, check if we're within the radius
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inCorner := (dx > 0 || dy > 0)
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withinRadius := dx*dx+dy*dy <= cornerRadius*cornerRadius
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// draw pixel if not in corner, or in corner and within radius
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// check bounds relative to the card's image bounds
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if (!inCorner || withinRadius) && px >= 0 && px < cardBounds.Dx() && py >= 0 && py < cardBounds.Dy() {
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card.Img.Set(px+cardBounds.Min.X, py+cardBounds.Min.Y, fillColor)
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}
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}
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}
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}