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