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Core Concepts
Graphics deals with images, which are, in their simplest form, nothing more than two-dimensional arrays of pixels, containing color information for each pixel:
At the core, there are two main interfaces:
image.Image and image/draw.Image. One serves as a readable image source, the other is used for drawing:// image.Image
type Image interface {
ColorModel() color.Model
Bounds() Rectangle
At(x, y int) color.Color
}
// draw.Image is an image.Image with a Set method to change a single pixel.
type Image interface {
image.Image
Set(x, y int, c color.Color)
}
TBA
type circle struct {
p image.Point
r int
}
func (c *circle) ColorModel() color.Model {
return color.AlphaModel
}
func (c *circle) Bounds() image.Rectangle {
return image.Rect(c.p.X-c.r, c.p.Y-c.r, c.p.X+c.r, c.p.Y+c.r)
}
func (c *circle) At(x, y int) color.Color {
xx, yy, rr := float64(x-c.p.X)+0.5, float64(y-c.p.Y)+0.5, float64(c.r)
if xx*xx+yy*yy < rr*rr {
return color.Alpha{255}
}
return color.Alpha{0}
}
Last modified 3yr ago