96 lines
3.3 KiB
Go
96 lines
3.3 KiB
Go
package main
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import (
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"github.com/gen2brain/raylib-go/physics"
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"github.com/gen2brain/raylib-go/raylib"
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)
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const (
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velocity = 0.5
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)
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func main() {
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screenWidth := float32(800)
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screenHeight := float32(450)
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raylib.SetConfigFlags(raylib.FlagMsaa4xHint)
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raylib.InitWindow(int32(screenWidth), int32(screenHeight), "Physac [raylib] - physics restitution")
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// Physac logo drawing position
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logoX := int32(screenWidth) - raylib.MeasureText("Physac", 30) - 10
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logoY := int32(15)
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// Initialize physics and default physics bodies
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physics.Init()
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// Create floor rectangle physics body
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floor := physics.NewBodyRectangle(raylib.NewVector2(screenWidth/2, screenHeight), screenWidth, 100, 10)
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floor.Enabled = false // Disable body state to convert it to static (no dynamics, but collisions)
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floor.Restitution = 1
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// Create circles physics body
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circleA := physics.NewBodyCircle(raylib.NewVector2(screenWidth*0.25, screenHeight/2), 30, 10)
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circleA.Restitution = 0
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circleB := physics.NewBodyCircle(raylib.NewVector2(screenWidth*0.5, screenHeight/2), 30, 10)
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circleB.Restitution = 0.5
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circleC := physics.NewBodyCircle(raylib.NewVector2(screenWidth*0.75, screenHeight/2), 30, 10)
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circleC.Restitution = 1
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raylib.SetTargetFPS(60)
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for !raylib.WindowShouldClose() {
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// Update created physics objects
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physics.Update()
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if raylib.IsKeyPressed(raylib.KeyR) { // Reset physics input
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// Reset circles physics bodies position and velocity
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circleA.Position = raylib.NewVector2(screenWidth*0.25, screenHeight/2)
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circleA.Velocity = raylib.NewVector2(0, 0)
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circleB.Position = raylib.NewVector2(screenWidth*0.5, screenHeight/2)
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circleB.Velocity = raylib.NewVector2(0, 0)
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circleC.Position = raylib.NewVector2(screenWidth*0.75, screenHeight/2)
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circleC.Velocity = raylib.NewVector2(0, 0)
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}
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raylib.BeginDrawing()
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raylib.ClearBackground(raylib.Black)
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raylib.DrawFPS(int32(screenWidth)-90, int32(screenHeight)-30)
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// Draw created physics bodies
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for i, body := range physics.GetBodies() {
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vertexCount := physics.GetShapeVerticesCount(i)
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for j := 0; j < vertexCount; j++ {
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// Get physics bodies shape vertices to draw lines
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// NOTE: GetShapeVertex() already calculates rotation transformations
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vertexA := body.GetShapeVertex(j)
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jj := 0
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if j+1 < vertexCount { // Get next vertex or first to close the shape
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jj = j + 1
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}
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vertexB := body.GetShapeVertex(jj)
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raylib.DrawLineV(vertexA, vertexB, raylib.Green) // Draw a line between two vertex positions
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}
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}
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raylib.DrawText("Restitution amount", (int32(screenWidth)-raylib.MeasureText("Restitution amount", 30))/2, 75, 30, raylib.White)
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raylib.DrawText("0", int32(circleA.Position.X)-raylib.MeasureText("0", 20)/2, int32(circleA.Position.Y)-7, 20, raylib.White)
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raylib.DrawText("0.5", int32(circleB.Position.X)-raylib.MeasureText("0.5", 20)/2, int32(circleB.Position.Y)-7, 20, raylib.White)
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raylib.DrawText("1", int32(circleC.Position.X)-raylib.MeasureText("1", 20)/2, int32(circleC.Position.Y)-7, 20, raylib.White)
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raylib.DrawText("Press 'R' to reset example", 10, 10, 10, raylib.White)
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raylib.DrawText("Physac", logoX, logoY, 30, raylib.White)
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raylib.DrawText("Powered by", logoX+50, logoY-7, 10, raylib.White)
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raylib.EndDrawing()
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}
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physics.Close() // Unitialize physics
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raylib.CloseWindow()
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}
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