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main.go
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main.go
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package main
import (
"github.com/gen2brain/raylib-go/physics"
"github.com/gen2brain/raylib-go/raylib"
)
func main() {
screenWidth := int32(800)
screenHeight := int32(450)
rl.SetConfigFlags(rl.FlagMsaa4xHint)
rl.InitWindow(screenWidth, screenHeight, "Physac [raylib] - physics demo")
// Physac logo drawing position
logoX := screenWidth - rl.MeasureText("Physac", 30) - 10
logoY := int32(15)
// Initialize physics and default physics bodies
physics.Init()
// Create floor rectangle physics body
floor := physics.NewBodyRectangle(rl.NewVector2(float32(screenWidth)/2, float32(screenHeight)), 500, 100, 10)
floor.Enabled = false // Disable body state to convert it to static (no dynamics, but collisions)
// Create obstacle circle physics body
circle := physics.NewBodyCircle(rl.NewVector2(float32(screenWidth)/2, float32(screenHeight)/2), 45, 10)
circle.Enabled = false // Disable body state to convert it to static (no dynamics, but collisions)
rl.SetTargetFPS(60)
for !rl.WindowShouldClose() {
// Update created physics objects
physics.Update()
if rl.IsKeyPressed(rl.KeyR) { // Reset physics input
physics.Reset()
floor = physics.NewBodyRectangle(rl.NewVector2(float32(screenWidth)/2, float32(screenHeight)), 500, 100, 10)
floor.Enabled = false
circle = physics.NewBodyCircle(rl.NewVector2(float32(screenWidth)/2, float32(screenHeight)/2), 45, 10)
circle.Enabled = false
}
// Physics body creation inputs
if rl.IsMouseButtonPressed(rl.MouseLeftButton) {
physics.NewBodyPolygon(rl.GetMousePosition(), float32(rl.GetRandomValue(20, 80)), int(rl.GetRandomValue(3, 8)), 10)
} else if rl.IsMouseButtonPressed(rl.MouseRightButton) {
physics.NewBodyCircle(rl.GetMousePosition(), float32(rl.GetRandomValue(10, 45)), 10)
}
// Destroy falling physics bodies
for _, body := range physics.GetBodies() {
if body.Position.Y > float32(screenHeight)*2 {
physics.DestroyBody(body)
}
}
rl.BeginDrawing()
rl.ClearBackground(rl.Black)
rl.DrawFPS(screenWidth-90, screenHeight-30)
// Draw created physics bodies
for i, body := range physics.GetBodies() {
vertexCount := physics.GetShapeVerticesCount(i)
for j := 0; j < vertexCount; j++ {
// Get physics bodies shape vertices to draw lines
// NOTE: GetShapeVertex() already calculates rotation transformations
vertexA := body.GetShapeVertex(j)
jj := 0
if j+1 < vertexCount { // Get next vertex or first to close the shape
jj = j + 1
}
vertexB := body.GetShapeVertex(jj)
rl.DrawLineV(vertexA, vertexB, rl.Green) // Draw a line between two vertex positions
}
}
rl.DrawText("Left mouse button to create a polygon", 10, 10, 10, rl.White)
rl.DrawText("Right mouse button to create a circle", 10, 25, 10, rl.White)
rl.DrawText("Press 'R' to reset example", 10, 40, 10, rl.White)
rl.DrawText("Physac", logoX, logoY, 30, rl.White)
rl.DrawText("Powered by", logoX+50, logoY-7, 10, rl.White)
rl.EndDrawing()
}
physics.Close() // Unitialize physics
rl.CloseWindow()
}