85 lines
2.3 KiB
Go
85 lines
2.3 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
|
|
rl "github.com/gen2brain/raylib-go/raylib"
|
|
)
|
|
|
|
const screenW = int32(1280)
|
|
const screenH = int32(720)
|
|
const virtualScreenW = screenW / 5
|
|
const virtualScreenH = screenH / 5
|
|
const virtualRatio = float32(screenW) / float32(virtualScreenW)
|
|
|
|
func main() {
|
|
|
|
rl.InitWindow(screenW, screenH, "raylib [core] example - smooth pixel-perfect camera")
|
|
|
|
worldSpaceCam := rl.Camera2D{}
|
|
worldSpaceCam.Zoom = 1
|
|
|
|
screenSpaceCam := rl.Camera2D{}
|
|
screenSpaceCam.Zoom = 1
|
|
|
|
target := rl.LoadRenderTexture(virtualScreenW, virtualScreenH)
|
|
|
|
rec1 := rl.NewRectangle(120, 60, 80, 40)
|
|
rec2 := rl.NewRectangle(130, 70, 90, 30)
|
|
rec3 := rl.NewRectangle(140, 80, 65, 45)
|
|
|
|
sourceRec := rl.NewRectangle(0, 0, float32(target.Texture.Width), -float32(target.Texture.Height))
|
|
destRec := rl.NewRectangle(-virtualRatio, -virtualRatio, float32(screenW)+(virtualRatio*2), float32(screenH)+(virtualRatio*2))
|
|
|
|
origin := rl.NewVector2(0, 0)
|
|
|
|
rotation, camX, camY := float32(0), float32(0), float32(0)
|
|
|
|
rl.SetTargetFPS(60)
|
|
|
|
for !rl.WindowShouldClose() {
|
|
|
|
rotation += 60 * rl.GetFrameTime()
|
|
|
|
camX = float32(math.Sin(rl.GetTime()) * 50)
|
|
camY = float32(math.Cos(rl.GetTime()) * 30)
|
|
|
|
screenSpaceCam.Target = rl.NewVector2(camX, camY)
|
|
|
|
worldSpaceCam.Target.X = screenSpaceCam.Target.X
|
|
screenSpaceCam.Target.X -= worldSpaceCam.Target.X
|
|
screenSpaceCam.Target.X *= virtualRatio
|
|
|
|
worldSpaceCam.Target.Y = screenSpaceCam.Target.Y
|
|
screenSpaceCam.Target.Y -= worldSpaceCam.Target.Y
|
|
screenSpaceCam.Target.Y *= virtualRatio
|
|
|
|
rl.BeginTextureMode(target)
|
|
rl.ClearBackground(rl.RayWhite)
|
|
rl.BeginMode2D(worldSpaceCam)
|
|
|
|
rl.DrawRectanglePro(rec1, origin, rotation, rl.Black)
|
|
rl.DrawRectanglePro(rec2, origin, -rotation, rl.Red)
|
|
rl.DrawRectanglePro(rec3, origin, rotation+45, rl.Blue)
|
|
|
|
rl.EndMode2D()
|
|
rl.EndTextureMode()
|
|
|
|
rl.BeginDrawing()
|
|
rl.ClearBackground(rl.Red)
|
|
rl.BeginMode2D(screenSpaceCam)
|
|
rl.DrawTexturePro(target.Texture, sourceRec, destRec, origin, 0, rl.White)
|
|
rl.EndMode2D()
|
|
|
|
rl.DrawText("screen res "+fmt.Sprint(screenW)+"x"+fmt.Sprint(screenH), 10, 10, 20, rl.Black)
|
|
rl.DrawText("world res "+fmt.Sprint(virtualScreenW)+"x"+fmt.Sprint(virtualScreenH), 10, 30, 20, rl.Black)
|
|
rl.DrawFPS(screenW-100, 10)
|
|
|
|
rl.EndDrawing()
|
|
}
|
|
|
|
rl.UnloadRenderTexture(target)
|
|
|
|
rl.CloseWindow()
|
|
}
|