mirror of
https://github.com/hajimehoshi/ebiten.git
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123 lines
3.8 KiB
Go
123 lines
3.8 KiB
Go
// Copyright 2022 The Ebitengine Authors
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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 vector
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import (
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"image"
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"image/color"
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"math"
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"github.com/hajimehoshi/ebiten/v2"
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)
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var (
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whiteImage = ebiten.NewImage(3, 3)
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whiteSubImage = whiteImage.SubImage(image.Rect(1, 1, 2, 2)).(*ebiten.Image)
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)
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func init() {
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b := whiteImage.Bounds()
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pix := make([]byte, 4*b.Dx()*b.Dy())
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for i := range pix {
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pix[i] = 0xff
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}
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// This is hacky, but WritePixels is better than Fill in term of automatic texture packing.
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whiteImage.WritePixels(pix)
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}
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func drawVerticesForUtil(dst *ebiten.Image, vs []ebiten.Vertex, is []uint16, clr color.Color, antialias bool) {
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r, g, b, a := clr.RGBA()
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for i := range vs {
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vs[i].SrcX = 1
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vs[i].SrcY = 1
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vs[i].ColorR = float32(r) / 0xffff
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vs[i].ColorG = float32(g) / 0xffff
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vs[i].ColorB = float32(b) / 0xffff
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vs[i].ColorA = float32(a) / 0xffff
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}
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op := &ebiten.DrawTrianglesOptions{}
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op.ColorScaleMode = ebiten.ColorScaleModePremultipliedAlpha
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op.AntiAlias = antialias
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dst.DrawTriangles(vs, is, whiteSubImage, op)
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}
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// StrokeLine strokes a line (x0, y0)-(x1, y1) with the specified width and color.
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func StrokeLine(dst *ebiten.Image, x0, y0, x1, y1 float32, strokeWidth float32, clr color.Color, antialias bool) {
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var path Path
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path.MoveTo(x0, y0)
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path.LineTo(x1, y1)
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strokeOp := &StrokeOptions{}
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strokeOp.Width = strokeWidth
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vs, is := path.AppendVerticesAndIndicesForStroke(nil, nil, strokeOp)
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drawVerticesForUtil(dst, vs, is, clr, antialias)
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}
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// DrawFilledRect fills a rectangle with the specified width and color.
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func DrawFilledRect(dst *ebiten.Image, x, y, width, height float32, clr color.Color, antialias bool) {
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var path Path
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path.MoveTo(x, y)
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path.LineTo(x, y+height)
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path.LineTo(x+width, y+height)
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path.LineTo(x+width, y)
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vs, is := path.AppendVerticesAndIndicesForFilling(nil, nil)
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drawVerticesForUtil(dst, vs, is, clr, antialias)
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}
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// StrokeRect strokes a rectangle with the specified width and color.
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//
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// clr has be to be a solid (non-transparent) color.
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func StrokeRect(dst *ebiten.Image, x, y, width, height float32, strokeWidth float32, clr color.Color, antialias bool) {
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var path Path
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path.MoveTo(x, y)
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path.LineTo(x, y+height)
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path.LineTo(x+width, y+height)
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path.LineTo(x+width, y)
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path.Close()
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strokeOp := &StrokeOptions{}
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strokeOp.Width = strokeWidth
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strokeOp.MiterLimit = 10
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vs, is := path.AppendVerticesAndIndicesForStroke(nil, nil, strokeOp)
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drawVerticesForUtil(dst, vs, is, clr, antialias)
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}
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// DrawFilledCircle fills a circle with the specified center position (cx, cy), the radius (r), width and color.
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func DrawFilledCircle(dst *ebiten.Image, cx, cy, r float32, clr color.Color, antialias bool) {
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var path Path
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path.Arc(cx, cy, r, 0, 2*math.Pi, Clockwise)
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vs, is := path.AppendVerticesAndIndicesForFilling(nil, nil)
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drawVerticesForUtil(dst, vs, is, clr, antialias)
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}
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// StrokeCircle strokes a circle with the specified center position (cx, cy), the radius (r), width and color.
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//
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// clr has be to be a solid (non-transparent) color.
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func StrokeCircle(dst *ebiten.Image, cx, cy, r float32, strokeWidth float32, clr color.Color, antialias bool) {
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var path Path
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path.Arc(cx, cy, r, 0, 2*math.Pi, Clockwise)
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path.Close()
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strokeOp := &StrokeOptions{}
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strokeOp.Width = strokeWidth
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vs, is := path.AppendVerticesAndIndicesForStroke(nil, nil, strokeOp)
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drawVerticesForUtil(dst, vs, is, clr, antialias)
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}
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