blooblib/draw_text.go

package bloob

import "math"

func (image *Image) DrawText(str string, font *Font, pos Vec2i, color Color) {
	origX := pos.X
	for _, ch := range str {
		c := font.chars[ch]
		if ch == 10 {
			pos.X = origX
			pos.Y += font.lineHeight
			continue
		}
		image.DrawColor(c.image, pos, color)
		pos.X += c.xForward
	}
}

func (image *Image) DrawTextCenter(str string, font *Font, rect Recti, color Color) {
	size := font.StringBounds(str)
	pos := Add(DivScalar(Sub(rect.Size, size), 2), Add(rect.Pos, Vec2i{X: 0, Y: 1}))
	image.DrawText(str, font, pos, color)
}

func (image *Image) DrawTextSin(str string, font *Font, pos Vec2i, color Color, freq, amplitude, phase float64) {
	origX := pos.X
	for _, ch := range str {
		c := font.chars[ch]
		if ch == 10 {
			pos.X = origX
			pos.Y += font.lineHeight
			continue
		}
		image.DrawColor(c.image, Vec2i{X: pos.X, Y: int(math.Sin(float64(pos.X)*math.Pi/4/freq+phase*math.Pi*2)*amplitude) + pos.Y}, color)
		pos.X += c.xForward
	}
}

func (image *Image) DrawTextOutline(str string, font *Font, pos Vec2i, color, outlineColor Color) {
	origX := pos.X
	for _, ch := range str {
		c := font.chars[ch]
		if ch == 10 {
			pos.X = origX
			pos.Y += font.lineHeight
			continue
		}
		x := pos.X
		y := pos.Y
		image.DrawColor(c.image, Vec2i{X: x - 1, Y: y}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x + 1, Y: y}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x, Y: y - 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x, Y: y + 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x - 1, Y: y - 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x + 1, Y: y + 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x + 1, Y: y - 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x - 1, Y: y + 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x, Y: y + 2}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x - 1, Y: y + 2}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x + 1, Y: y + 2}, outlineColor)
		image.DrawColor(c.image, pos, color)
		pos.X += c.xForward
	}
}

func (image *Image) DrawTextOutlineCenter(str string, font *Font, rect Recti, color, outlineColor Color) {
	size := font.StringBounds(str)
	pos := Add(DivScalar(Sub(rect.Size, size), 2), Add(rect.Pos, Vec2i{X: 0, Y: 1}))
	image.DrawTextOutline(str, font, pos, color, outlineColor)
}

func (image *Image) DrawTextOutlineSin(str string, font *Font, pos Vec2i, color, outlineColor Color, freq, amplitude, phase float64) {
	origX := pos.X
	for _, ch := range str {
		c := font.chars[ch]
		if ch == 10 {
			pos.X = origX
			pos.Y += font.lineHeight
			continue
		}
		x := pos.X
		y := int(math.Sin(float64(pos.X)*math.Pi/4/freq+phase*math.Pi*2)*amplitude) + pos.Y
		image.DrawColor(c.image, Vec2i{X: x - 1, Y: y}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x + 1, Y: y}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x, Y: y - 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x, Y: y + 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x - 1, Y: y - 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x + 1, Y: y + 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x + 1, Y: y - 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x - 1, Y: y + 1}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x, Y: y + 2}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x - 1, Y: y + 2}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x + 1, Y: y + 2}, outlineColor)
		image.DrawColor(c.image, Vec2i{X: x, Y: y}, color)
		pos.X += c.xForward
	}
}