133 lines
3.3 KiB
Go
133 lines
3.3 KiB
Go
package d2mapengine
|
|
|
|
import (
|
|
"math"
|
|
|
|
"github.com/OpenDiablo2/OpenDiablo2/d2common"
|
|
)
|
|
|
|
type worldTrans struct {
|
|
x float64
|
|
y float64
|
|
}
|
|
|
|
type Viewport struct {
|
|
screenRect d2common.Rectangle
|
|
transStack []worldTrans
|
|
transCurrent worldTrans
|
|
camera *Camera
|
|
}
|
|
|
|
func NewViewport(x, y, width, height int) *Viewport {
|
|
return &Viewport{
|
|
screenRect: d2common.Rectangle{
|
|
Left: x,
|
|
Top: y,
|
|
Width: width,
|
|
Height: height,
|
|
},
|
|
}
|
|
}
|
|
|
|
func (v *Viewport) SetCamera(camera *Camera) {
|
|
v.camera = camera
|
|
}
|
|
|
|
func (v *Viewport) WorldToScreen(x, y float64) (int, int) {
|
|
return v.OrthoToScreen(v.WorldToOrtho(x, y))
|
|
}
|
|
|
|
func (v *Viewport) ScreenToWorld(x, y int) (float64, float64) {
|
|
return v.OrthoToWorld(v.ScreenToOrtho(x, y))
|
|
}
|
|
|
|
func (v *Viewport) OrthoToWorld(x, y float64) (float64, float64) {
|
|
worldX := (x/80 + y/40) / 2
|
|
worldY := (y/40 - x/80) / 2
|
|
return worldX, worldY
|
|
}
|
|
|
|
func (v *Viewport) WorldToOrtho(x, y float64) (float64, float64) {
|
|
orthoX := (x - y) * 80
|
|
orthoY := (x + y) * 40
|
|
return orthoX, orthoY
|
|
}
|
|
|
|
func (v *Viewport) ScreenToOrtho(x, y int) (float64, float64) {
|
|
camX, camY := v.getCameraOffset()
|
|
screenX := float64(x) + camX - float64(v.screenRect.Left)
|
|
screenY := float64(y) + camY - float64(v.screenRect.Top)
|
|
return screenX, screenY
|
|
}
|
|
|
|
func (v *Viewport) OrthoToScreen(x, y float64) (int, int) {
|
|
camOrthoX, camOrthoY := v.getCameraOffset()
|
|
orthoX := int(math.Floor(x - camOrthoX + float64(v.screenRect.Left)))
|
|
orthoY := int(math.Floor(y - camOrthoY + float64(v.screenRect.Top)))
|
|
return orthoX, orthoY
|
|
}
|
|
|
|
func (v *Viewport) IsTileVisible(x, y float64) bool {
|
|
orthoX1, orthoY1 := v.WorldToOrtho(x-3, y)
|
|
orthoX2, orthoY2 := v.WorldToOrtho(x+3, y)
|
|
return v.IsOrthoRectVisible(orthoX1, orthoY1, orthoX2, orthoY2)
|
|
}
|
|
|
|
func (v *Viewport) IsTileRectVisible(rect d2common.Rectangle) bool {
|
|
left := float64((rect.Left - rect.Bottom()) * 80)
|
|
top := float64((rect.Left + rect.Top) * 40)
|
|
right := float64((rect.Right() - rect.Top) * 80)
|
|
bottom := float64((rect.Right() + rect.Bottom()) * 40)
|
|
return v.IsOrthoRectVisible(left, top, right, bottom)
|
|
}
|
|
|
|
func (v *Viewport) IsOrthoRectVisible(x1, y1, x2, y2 float64) bool {
|
|
screenX1, screenY1 := v.OrthoToScreen(x1, y1)
|
|
screenX2, screenY2 := v.OrthoToScreen(x2, y2)
|
|
return !(screenX1 >= v.screenRect.Width || screenX2 < 0 || screenY1 >= v.screenRect.Height || screenY2 < 0)
|
|
}
|
|
|
|
func (v *Viewport) GetTranslationOrtho() (float64, float64) {
|
|
return v.transCurrent.x, v.transCurrent.y
|
|
}
|
|
|
|
func (v *Viewport) GetTranslationScreen() (int, int) {
|
|
return v.OrthoToScreen(v.transCurrent.x, v.transCurrent.y)
|
|
}
|
|
|
|
func (v *Viewport) PushTranslationOrtho(x, y float64) {
|
|
v.transStack = append(v.transStack, v.transCurrent)
|
|
v.transCurrent.x += x
|
|
v.transCurrent.y += y
|
|
}
|
|
|
|
func (v *Viewport) PushTranslationWorld(x, y float64) {
|
|
v.PushTranslationOrtho(v.WorldToOrtho(x, y))
|
|
}
|
|
|
|
func (v *Viewport) PushTranslationScreen(x, y int) {
|
|
v.PushTranslationOrtho(v.ScreenToOrtho(x, y))
|
|
}
|
|
|
|
func (v *Viewport) PopTranslation() {
|
|
count := len(v.transStack)
|
|
if count == 0 {
|
|
panic("empty stack")
|
|
}
|
|
|
|
v.transCurrent = v.transStack[count-1]
|
|
v.transStack = v.transStack[:count-1]
|
|
}
|
|
|
|
func (v *Viewport) getCameraOffset() (float64, float64) {
|
|
var camX, camY float64
|
|
if v.camera != nil {
|
|
camX, camY = v.camera.GetPosition()
|
|
}
|
|
|
|
camX -= float64(v.screenRect.Width / 2)
|
|
camY -= float64(v.screenRect.Height / 2)
|
|
|
|
return camX, camY
|
|
}
|