mirror of https://github.com/mum4k/termdash.git
78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package draw
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// box.go contains code that draws boxes.
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import (
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"fmt"
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"image"
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"github.com/mum4k/termdash/canvas"
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"github.com/mum4k/termdash/cell"
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)
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// boxChar returns the correct box character from the parts for the use at the
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// specified point of the box. Returns -1 if no character should be at this point.
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func boxChar(p image.Point, box image.Rectangle, parts map[linePart]rune) rune {
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switch {
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case p.X == box.Min.X && p.Y == box.Min.Y:
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return parts[topLeftCorner]
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case p.X == box.Max.X-1 && p.Y == box.Min.Y:
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return parts[topRightCorner]
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case p.X == box.Min.X && p.Y == box.Max.Y-1:
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return parts[bottomLeftCorner]
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case p.X == box.Max.X-1 && p.Y == box.Max.Y-1:
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return parts[bottomRightCorner]
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case p.X == box.Min.X || p.X == box.Max.X-1:
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return parts[vLine]
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case p.Y == box.Min.Y || p.Y == box.Max.Y-1:
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return parts[hLine]
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}
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return -1
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}
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// Box draws a box on the canvas.
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func Box(c *canvas.Canvas, box image.Rectangle, ls LineStyle, opts ...cell.Option) error {
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if ar := c.Area(); !box.In(ar) {
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return fmt.Errorf("the requested box %+v falls outside of the provided canvas %+v", box, ar)
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}
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const minSize = 2
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if box.Dx() < minSize || box.Dy() < minSize {
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return fmt.Errorf("the smallest supported box is %dx%d, got: %dx%d", minSize, minSize, box.Dx(), box.Dy())
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}
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parts, err := lineParts(ls)
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if err != nil {
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return err
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}
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for col := box.Min.X; col < box.Max.X; col++ {
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for row := box.Min.Y; row < box.Max.Y; row++ {
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p := image.Point{col, row}
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r := boxChar(p, box, parts)
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if r == -1 {
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continue
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}
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if err := c.SetCell(p, r, opts...); err != nil {
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return err
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}
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}
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}
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return nil
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}
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