ebiten/shapes.go
2015-01-17 23:33:57 +09:00

97 lines
1.9 KiB
Go

// Copyright 2015 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ebiten
import (
"image/color"
)
// A Lines represents the set of lines.
type Lines interface {
Len() int
Points(i int) (x0, y0, x1, y1 int)
Color(i int) color.Color
}
type line struct {
x0, y0 int
x1, y1 int
color color.Color
}
func (l *line) Len() int {
return 1
}
func (l *line) Points(i int) (x0, y0, x1, y1 int) {
return l.x0, l.y0, l.x1, l.y1
}
func (l *line) Color(i int) color.Color {
return l.color
}
type rectsAsLines struct {
Rects
}
func (r *rectsAsLines) Len() int {
return r.Rects.Len() * 4
}
func (r *rectsAsLines) Points(i int) (x0, y0, x1, y1 int) {
x, y, w, h := r.Rects.Rect(i / 4)
switch i % 4 {
case 0:
return x, y, x + w, y
case 1:
return x, y + 1, x, y + h - 1
case 2:
return x, y + h - 1, x + w, y + h - 1
case 3:
return x + w - 1, y + 1, x + w - 1, y + h - 1
}
panic("not reach")
}
func (r *rectsAsLines) Color(i int) color.Color {
return r.Rects.Color(i / 4)
}
// A Rects represents the set of rectangles.
type Rects interface {
Len() int
Rect(i int) (x, y, width, height int)
Color(i int) color.Color
}
type rect struct {
x, y int
width, height int
color color.Color
}
func (r *rect) Len() int {
return 1
}
func (r *rect) Rect(i int) (x, y, width, height int) {
return r.x, r.y, r.width, r.height
}
func (r *rect) Color(i int) color.Color {
return r.color
}