72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
package termui
|
|
|
|
import (
|
|
"image"
|
|
)
|
|
|
|
type Canvas struct {
|
|
CellMap map[image.Point]Cell
|
|
Block
|
|
}
|
|
|
|
func NewCanvas() *Canvas {
|
|
return &Canvas{
|
|
Block: *NewBlock(),
|
|
CellMap: make(map[image.Point]Cell),
|
|
}
|
|
}
|
|
|
|
// points given as arguments correspond to dots within a braille character
|
|
// and therefore have 2x4 times the resolution of a normal cell
|
|
func (self *Canvas) Line(p0, p1 image.Point, color Color) {
|
|
leftPoint, rightPoint := p0, p1
|
|
if leftPoint.X > rightPoint.X {
|
|
leftPoint, rightPoint = rightPoint, leftPoint
|
|
}
|
|
|
|
xDistance := AbsInt(leftPoint.X - rightPoint.X)
|
|
yDistance := AbsInt(leftPoint.Y - rightPoint.Y)
|
|
slope := float64(yDistance) / float64(xDistance)
|
|
slopeDirection := 1
|
|
if rightPoint.Y < leftPoint.Y {
|
|
slopeDirection = -1
|
|
}
|
|
|
|
targetYCoordinate := float64(leftPoint.Y)
|
|
currentYCoordinate := leftPoint.Y
|
|
for i := leftPoint.X; i < rightPoint.X; i++ {
|
|
targetYCoordinate += (slope * float64(slopeDirection))
|
|
if currentYCoordinate == int(targetYCoordinate) {
|
|
point := image.Pt(i/2, currentYCoordinate/4)
|
|
self.CellMap[point] = Cell{
|
|
self.CellMap[point].Rune | BRAILLE[currentYCoordinate%4][i%2],
|
|
NewStyle(color),
|
|
}
|
|
}
|
|
for currentYCoordinate != int(targetYCoordinate) {
|
|
point := image.Pt(i/2, currentYCoordinate/4)
|
|
self.CellMap[point] = Cell{
|
|
self.CellMap[point].Rune | BRAILLE[currentYCoordinate%4][i%2],
|
|
NewStyle(color),
|
|
}
|
|
currentYCoordinate += slopeDirection
|
|
}
|
|
}
|
|
}
|
|
|
|
func (self *Canvas) Point(p image.Point, color Color) {
|
|
point := image.Pt(p.X/2, p.Y/4)
|
|
self.CellMap[point] = Cell{
|
|
self.CellMap[point].Rune | BRAILLE[p.X%4][p.Y%2],
|
|
NewStyle(color),
|
|
}
|
|
}
|
|
|
|
func (self *Canvas) Draw(buf *Buffer) {
|
|
for point, cell := range self.CellMap {
|
|
if point.In(self.Rectangle) {
|
|
buf.SetCell(Cell{cell.Rune + BRAILLE_OFFSET, cell.Style}, point)
|
|
}
|
|
}
|
|
}
|