A rendering engine library for Go supporting both SDL2 and WebAssembly (HTML Canvas) targets.
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// Package sdl provides an SDL2 renderer for Doodle.
package sdl
import (
"git.kirsle.net/go/render"
"github.com/veandco/go-sdl2/sdl"
)
// Clear the canvas and set this color.
func (r *Renderer) Clear(color render.Color) {
if color != r.lastColor {
r.renderer.SetDrawColor(color.Red, color.Green, color.Blue, color.Alpha)
}
r.renderer.Clear()
}
// DrawPoint puts a color at a pixel.
func (r *Renderer) DrawPoint(color render.Color, point render.Point) {
if color != r.lastColor {
r.renderer.SetDrawColor(color.Red, color.Green, color.Blue, color.Alpha)
}
r.renderer.DrawPoint(point.X, point.Y)
}
// DrawLine draws a line between two points.
func (r *Renderer) DrawLine(color render.Color, a, b render.Point) {
if color != r.lastColor {
r.renderer.SetDrawColor(color.Red, color.Green, color.Blue, color.Alpha)
}
r.renderer.DrawLine(a.X, a.Y, b.X, b.Y)
}
// DrawRect draws a rectangle.
func (r *Renderer) DrawRect(color render.Color, rect render.Rect) {
if color != r.lastColor {
r.renderer.SetDrawColor(color.Red, color.Green, color.Blue, color.Alpha)
}
r.renderer.DrawRect(&sdl.Rect{
X: rect.X,
Y: rect.Y,
W: rect.W,
H: rect.H,
})
}
// DrawBox draws a filled rectangle.
func (r *Renderer) DrawBox(color render.Color, rect render.Rect) {
if color != r.lastColor {
r.renderer.SetDrawColor(color.Red, color.Green, color.Blue, color.Alpha)
}
r.renderer.FillRect(&sdl.Rect{
X: rect.X,
Y: rect.Y,
W: rect.W,
H: rect.H,
})
}