ebiten/examples/vector/main.go

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// Copyright 2019 The Ebiten Authors
//
// 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.
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//go:build example
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// +build example
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package main
import (
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"fmt"
"image"
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"image/color"
"log"
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"math"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
"github.com/hajimehoshi/ebiten/v2/vector"
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)
var (
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emptyImage = ebiten.NewImage(3, 3)
// emptySubImage is an internal sub image of emptyImage.
// Use emptySubImage at DrawTriangles instead of emptyImage in order to avoid bleeding edges.
emptySubImage = emptyImage.SubImage(image.Rect(1, 1, 2, 2)).(*ebiten.Image)
)
func init() {
emptyImage.Fill(color.White)
}
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const (
screenWidth = 640
screenHeight = 480
)
func drawEbitenText(screen *ebiten.Image) {
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var path vector.Path
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// E
path.MoveTo(20, 20)
path.LineTo(20, 70)
path.LineTo(70, 70)
path.LineTo(70, 60)
path.LineTo(30, 60)
path.LineTo(30, 50)
path.LineTo(70, 50)
path.LineTo(70, 40)
path.LineTo(30, 40)
path.LineTo(30, 30)
path.LineTo(70, 30)
path.LineTo(70, 20)
// B
path.MoveTo(80, 20)
path.LineTo(80, 70)
path.LineTo(100, 70)
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path.QuadTo(150, 57.5, 100, 45)
path.QuadTo(150, 32.5, 100, 20)
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// I
path.MoveTo(140, 20)
path.LineTo(140, 70)
path.LineTo(150, 70)
path.LineTo(150, 20)
// T
path.MoveTo(160, 20)
path.LineTo(160, 30)
path.LineTo(180, 30)
path.LineTo(180, 70)
path.LineTo(190, 70)
path.LineTo(190, 30)
path.LineTo(210, 30)
path.LineTo(210, 20)
// E
path.MoveTo(220, 20)
path.LineTo(220, 70)
path.LineTo(270, 70)
path.LineTo(270, 60)
path.LineTo(230, 60)
path.LineTo(230, 50)
path.LineTo(270, 50)
path.LineTo(270, 40)
path.LineTo(230, 40)
path.LineTo(230, 30)
path.LineTo(270, 30)
path.LineTo(270, 20)
// N
path.MoveTo(280, 20)
path.LineTo(280, 70)
path.LineTo(290, 70)
path.LineTo(290, 35)
path.LineTo(320, 70)
path.LineTo(330, 70)
path.LineTo(330, 20)
path.LineTo(320, 20)
path.LineTo(320, 55)
path.LineTo(290, 20)
op := &ebiten.DrawTrianglesOptions{
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FillRule: ebiten.EvenOdd,
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}
vs, is := path.AppendVerticesAndIndicesForFilling(nil, nil)
for i := range vs {
vs[i].SrcX = 1
vs[i].SrcY = 1
vs[i].ColorR = 0xdb / float32(0xff)
vs[i].ColorG = 0x56 / float32(0xff)
vs[i].ColorB = 0x20 / float32(0xff)
}
screen.DrawTriangles(vs, is, emptySubImage, op)
}
func drawEbitenLogo(screen *ebiten.Image, x, y int) {
const unit = 16
var path vector.Path
xf, yf := float32(x), float32(y)
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// TODO: Add curves
path.MoveTo(xf, yf+4*unit)
path.LineTo(xf, yf+6*unit)
path.LineTo(xf+2*unit, yf+6*unit)
path.LineTo(xf+2*unit, yf+5*unit)
path.LineTo(xf+3*unit, yf+5*unit)
path.LineTo(xf+3*unit, yf+4*unit)
path.LineTo(xf+4*unit, yf+4*unit)
path.LineTo(xf+4*unit, yf+2*unit)
path.LineTo(xf+6*unit, yf+2*unit)
path.LineTo(xf+6*unit, yf+1*unit)
path.LineTo(xf+5*unit, yf+1*unit)
path.LineTo(xf+5*unit, yf)
path.LineTo(xf+4*unit, yf)
path.LineTo(xf+4*unit, yf+2*unit)
path.LineTo(xf+2*unit, yf+2*unit)
path.LineTo(xf+2*unit, yf+3*unit)
path.LineTo(xf+unit, yf+3*unit)
path.LineTo(xf+unit, yf+4*unit)
op := &ebiten.DrawTrianglesOptions{
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FillRule: ebiten.EvenOdd,
}
vs, is := path.AppendVerticesAndIndicesForFilling(nil, nil)
for i := range vs {
vs[i].SrcX = 1
vs[i].SrcY = 1
vs[i].ColorR = 0xdb / float32(0xff)
vs[i].ColorG = 0x56 / float32(0xff)
vs[i].ColorB = 0x20 / float32(0xff)
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}
screen.DrawTriangles(vs, is, emptySubImage, op)
}
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func drawArc(screen *ebiten.Image, count int) {
var path vector.Path
path.MoveTo(350, 100)
const cx, cy, r = 450, 100, 70
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theta1 := math.Pi * float64(count) / 180
x := cx + r*math.Cos(theta1)
y := cy + r*math.Sin(theta1)
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path.ArcTo(450, 100, float32(x), float32(y), 30)
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theta2 := math.Pi * float64(count) / 180 / 3
path.MoveTo(550, 100)
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path.Arc(550, 100, 50, float32(theta1), float32(theta2), vector.Clockwise)
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op := &ebiten.DrawTrianglesOptions{
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FillRule: ebiten.EvenOdd,
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}
vs, is := path.AppendVerticesAndIndicesForFilling(nil, nil)
for i := range vs {
vs[i].SrcX = 1
vs[i].SrcY = 1
vs[i].ColorR = 0x33 / float32(0xff)
vs[i].ColorG = 0xcc / float32(0xff)
vs[i].ColorB = 0x66 / float32(0xff)
}
screen.DrawTriangles(vs, is, emptySubImage, op)
}
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func maxCounter(index int) int {
return 128 + (17*index+32)%64
}
func drawWave(screen *ebiten.Image, counter int) {
var path vector.Path
const npoints = 8
indexToPoint := func(i int, counter int) (float32, float32) {
x, y := float32(i*screenWidth/(npoints-1)), float32(screenHeight/2)
y += float32(30 * math.Sin(float64(counter)*2*math.Pi/float64(maxCounter(i))))
return x, y
}
for i := 0; i <= npoints; i++ {
if i == 0 {
path.MoveTo(indexToPoint(i, counter))
continue
}
cpx0, cpy0 := indexToPoint(i-1, counter)
x, y := indexToPoint(i, counter)
cpx1, cpy1 := x, y
cpx0 += 30
cpx1 -= 30
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path.CubicTo(cpx0, cpy0, cpx1, cpy1, x, y)
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}
path.LineTo(screenWidth, screenHeight)
path.LineTo(0, screenHeight)
op := &ebiten.DrawTrianglesOptions{
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FillRule: ebiten.EvenOdd,
}
vs, is := path.AppendVerticesAndIndicesForFilling(nil, nil)
for i := range vs {
vs[i].SrcX = 1
vs[i].SrcY = 1
vs[i].ColorR = 0x33 / float32(0xff)
vs[i].ColorG = 0x66 / float32(0xff)
vs[i].ColorB = 0xff / float32(0xff)
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}
screen.DrawTriangles(vs, is, emptySubImage, op)
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}
type Game struct {
counter int
}
func (g *Game) Update() error {
g.counter++
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
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screen.Fill(color.White)
drawEbitenText(screen)
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drawEbitenLogo(screen, 20, 90)
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drawArc(screen, g.counter)
drawWave(screen, g.counter)
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ebitenutil.DebugPrint(screen, fmt.Sprintf("TPS: %0.2f\nFPS: %0.2f", ebiten.ActualTPS(), ebiten.ActualFPS()))
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
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}
func main() {
g := &Game{counter: 0}
ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Vector (Ebiten Demo)")
if err := ebiten.RunGame(g); err != nil {
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log.Fatal(err)
}
}