appview/ogcard: add utility to draw rounded rectangles

··· 257 257 return textWidth, err 258 258 } 259 259 260 + func (c *Card) FontHeight(sizePt float64) int { 261 + ft := freetype.NewContext() 262 + ft.SetDPI(72) 263 + ft.SetFont(c.Font) 264 + ft.SetFontSize(sizePt) 265 + return ft.PointToFixed(sizePt).Ceil() 266 + } 267 + 268 + func (c *Card) TextWidth(text string, sizePt float64) int { 269 + face := truetype.NewFace(c.Font, &truetype.Options{Size: sizePt, DPI: 72}) 270 + lineWidth := font.MeasureString(face, text) 271 + textWidth := lineWidth.Ceil() 272 + return textWidth 273 + } 274 + 260 275 // DrawBoldText draws bold text by rendering multiple times with slight offsets 261 276 func (c *Card) DrawBoldText(text string, x, y int, textColor color.Color, sizePt float64, valign VAlign, halign HAlign) (int, error) { 262 277 // Draw the text multiple times with slight offsets to create bold effect ··· 582 597 func (c *Card) DrawRect(startX, startY, endX, endY int, color color.Color) { 583 598 draw.Draw(c.Img, image.Rect(startX, startY, endX, endY), &image.Uniform{color}, image.Point{}, draw.Src) 584 599 } 600 + 601 + // drawRoundedRect draws a filled rounded rectangle on the given card 602 + func (card *Card) DrawRoundedRect(x, y, width, height, cornerRadius int, fillColor color.RGBA) { 603 + cardBounds := card.Img.Bounds() 604 + for py := y; py < y+height; py++ { 605 + for px := x; px < x+width; px++ { 606 + // calculate distance from corners 607 + dx := 0 608 + dy := 0 609 + 610 + // check which corner region we're in 611 + if px < x+cornerRadius && py < y+cornerRadius { 612 + // top-left corner 613 + dx = x + cornerRadius - px 614 + dy = y + cornerRadius - py 615 + } else if px >= x+width-cornerRadius && py < y+cornerRadius { 616 + // top-right corner 617 + dx = px - (x + width - cornerRadius - 1) 618 + dy = y + cornerRadius - py 619 + } else if px < x+cornerRadius && py >= y+height-cornerRadius { 620 + // bottom-left corner 621 + dx = x + cornerRadius - px 622 + dy = py - (y + height - cornerRadius - 1) 623 + } else if px >= x+width-cornerRadius && py >= y+height-cornerRadius { 624 + // Bottom-right corner 625 + dx = px - (x + width - cornerRadius - 1) 626 + dy = py - (y + height - cornerRadius - 1) 627 + } 628 + 629 + // if we're in a corner, check if we're within the radius 630 + inCorner := (dx > 0 || dy > 0) 631 + withinRadius := dx*dx+dy*dy <= cornerRadius*cornerRadius 632 + 633 + // draw pixel if not in corner, or in corner and within radius 634 + // check bounds relative to the card's image bounds 635 + if (!inCorner || withinRadius) && px >= 0 && px < cardBounds.Dx() && py >= 0 && py < cardBounds.Dy() { 636 + card.Img.Set(px+cardBounds.Min.X, py+cardBounds.Min.Y, fillColor) 637 + } 638 + } 639 + } 640 + }