mirror of
https://codeberg.org/scip/golsky.git
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Thomas von Dein
03e1101248
- renamed scene files - fixed options back using scene.Prev - fixed initial zooming (finally) - fixed reset zoom (key r) - fixed initial size, now works with state loading as well
82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
// this comes from the camera example but I enhanced it a little bit
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package main
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import (
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"fmt"
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"math"
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"github.com/hajimehoshi/ebiten/v2"
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"golang.org/x/image/math/f64"
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)
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type Camera struct {
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ViewPort f64.Vec2
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Position f64.Vec2
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ZoomFactor int
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InitialZoomFactor int
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InitialPosition f64.Vec2
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ZoomOutFactor int
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}
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func (c *Camera) String() string {
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return fmt.Sprintf(
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"T: %.1f, S: %d",
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c.Position, c.ZoomFactor,
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)
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}
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func (c *Camera) viewportCenter() f64.Vec2 {
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return f64.Vec2{
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c.ViewPort[0] * 0.5,
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c.ViewPort[1] * 0.5,
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}
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}
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func (c *Camera) worldMatrix() ebiten.GeoM {
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m := ebiten.GeoM{}
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m.Translate(-c.Position[0], -c.Position[1])
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viewportCenter := c.viewportCenter()
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// We want to scale and rotate around center of image / screen
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m.Translate(-viewportCenter[0], -viewportCenter[1])
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m.Scale(
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math.Pow(1.01, float64(c.ZoomFactor)),
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math.Pow(1.01, float64(c.ZoomFactor)),
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)
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m.Translate(viewportCenter[0], viewportCenter[1])
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return m
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}
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func (c *Camera) Render(world, screen *ebiten.Image) {
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screen.DrawImage(world, &ebiten.DrawImageOptions{
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GeoM: c.worldMatrix(),
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})
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}
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func (c *Camera) ScreenToWorld(posX, posY int) (float64, float64) {
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inverseMatrix := c.worldMatrix()
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if inverseMatrix.IsInvertible() {
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inverseMatrix.Invert()
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return inverseMatrix.Apply(float64(posX), float64(posY))
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} else {
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// When scaling it can happened that matrix is not invertable
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return math.NaN(), math.NaN()
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}
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}
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func (c *Camera) Setup() {
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c.Position[0] = c.InitialPosition[0]
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c.Position[1] = c.InitialPosition[1]
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c.ZoomFactor = c.InitialZoomFactor
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}
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func (c *Camera) Reset() {
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c.Position[0] = c.InitialPosition[0]
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c.Position[1] = c.InitialPosition[1]
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c.ZoomFactor = c.ZoomOutFactor
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}
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