50 lines
850 B
Go
50 lines
850 B
Go
|
package render
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Pixel TODO: not a global
|
||
|
|
// TODO get rid of this ugly thing.
|
||
|
|
type Pixel struct {
|
||
|
|
Start bool
|
||
|
|
X int32
|
||
|
|
Y int32
|
||
|
|
DX int32
|
||
|
|
DY int32
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p Pixel) String() string {
|
||
|
|
return fmt.Sprintf("(%d,%d) delta (%d,%d)",
|
||
|
|
p.X, p.Y,
|
||
|
|
p.DX, p.DY,
|
||
|
|
)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Grid is a 2D grid of pixels in X,Y notation.
|
||
|
|
type Grid map[Pixel]interface{}
|
||
|
|
|
||
|
|
// Exists returns true if the point exists on the grid.
|
||
|
|
func (g *Grid) Exists(p Pixel) bool {
|
||
|
|
if _, ok := (*g)[p]; ok {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
// Draw the grid efficiently.
|
||
|
|
func (g *Grid) Draw(e Engine) {
|
||
|
|
for pixel := range *g {
|
||
|
|
if pixel.DX == 0 && pixel.DY == 0 {
|
||
|
|
e.DrawPoint(Black, Point{
|
||
|
|
X: pixel.X,
|
||
|
|
Y: pixel.Y,
|
||
|
|
})
|
||
|
|
} else {
|
||
|
|
for point := range IterLine(pixel.X, pixel.Y, pixel.DX, pixel.DY) {
|
||
|
|
e.DrawPoint(Black, point)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|