109 lines
2.3 KiB
Go
109 lines
2.3 KiB
Go
package main
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import (
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"fmt"
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"github.com/gen2brain/raylib-go/raylib"
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"github.com/ojrac/opensimplex-go"
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)
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func main() {
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const (
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screenWidth = 2200
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screenHeight = 1200
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)
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rl.InitWindow(screenWidth, screenHeight, "sumi sierpinski arrow")
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var camera rl.Camera2D
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camera.Zoom = 1.0
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rl.SetTargetFPS(60)
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angles := make([]float32, 1000)
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noise := opensimplex.NewNormalized(0)
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for i := range len(angles) {
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angles[i] = float32(noise.Eval2(float64(i)*0.0001, 0.00)) * 2 - 1
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fmt.Printf("angles[%d] = %.2f\n", i, angles[i])
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}
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frameNum := 0
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for !rl.WindowShouldClose() {
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frameNum++
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if rl.IsMouseButtonDown(rl.MouseRightButton) {
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delta := rl.GetMouseDelta()
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delta = rl.Vector2Scale(delta, -1.0/camera.Zoom)
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camera.Target = rl.Vector2Add(camera.Target, delta)
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}
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// Zoom based on mouse wheel
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wheel := rl.GetMouseWheelMove()
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if wheel != 0 {
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// Get the world point that is under the mouse
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mouseWorldPos := rl.GetScreenToWorld2D(rl.GetMousePosition(), camera)
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// Set the offset to where the mouse is
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camera.Offset = rl.GetMousePosition()
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// Set the target to match, so that the camera maps the world space point
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// under the cursor to the screen space point under the cursor at any zoom
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camera.Target = mouseWorldPos
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// Zoom increment
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const zoomIncrement float32 = 0.125
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camera.Zoom += (wheel * zoomIncrement)
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if camera.Zoom < zoomIncrement {
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camera.Zoom = zoomIncrement
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}
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}
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rl.BeginDrawing()
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rl.ClearBackground(rl.RayWhite)
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rl.BeginMode2D(camera)
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rl.PushMatrix()
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rl.Translatef(screenWidth/2, screenHeight/2, 0);
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// initial transform by halfway again through angle array
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angleIndex := frameNum%len(angles)
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angle := angles[angleIndex]
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initAngle := angles[(angleIndex + len(angles)/2)%len(angles)]
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rl.Rotatef(250*initAngle, 0, 0, 1)
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rl.Translatef(100*initAngle, 100*initAngle, 0)
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for range 1000 {
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rl.DrawLine(0, 0, 10, 0, rl.Black)
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rl.Translatef(10, 0, 0)
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rl.Rotatef(angle, 0, 0, 1)
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angleIndex++
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angleIndex = angleIndex%len(angles)
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angle += angles[angleIndex]
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}
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rl.PopMatrix()
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/*
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rl.PushMatrix()
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rl.Translatef(0, 25*50, 0)
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rl.Rotatef(90, 1, 0, 0)
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rl.DrawGrid(100, 50)
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rl.PopMatrix()
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*/
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rl.EndMode2D()
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rl.DrawText("Mouse right button drag to move, mouse wheel to zoom", 10, 10, 20, rl.White)
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rl.EndDrawing()
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}
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rl.CloseWindow()
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}
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