120 lines
3.7 KiB
ActionScript
120 lines
3.7 KiB
ActionScript
// Moving sprites example.
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// This sample demonstrates:
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// - Adding Sprite elements to the UI
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// - Storing custom data (sprite velocity) inside UI elements
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// - Handling frame update events in which the sprites are moved
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#include "Scripts/Utilities/Sample.as"
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// Number of sprites to draw
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const uint NUM_SPRITES = 100;
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Array<Sprite@> sprites;
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void Start()
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{
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// Execute the common startup for samples
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SampleStart();
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// Create the sprites to the user interface
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CreateSprites();
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// Hook up to the frame update events
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SubscribeToEvents();
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// Set the mouse mode to use in the sample
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SampleInitMouseMode(MM_FREE);
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}
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void CreateSprites()
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{
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// Get rendering window size as floats
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float width = graphics.width;
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float height = graphics.height;
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// Get the Urho3D fish texture
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Texture2D@ decalTex = cache.GetResource("Texture2D", "Textures/UrhoDecal.dds");
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for (uint i = 0; i < NUM_SPRITES; ++i)
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{
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// Create a new sprite, set it to use the texture
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Sprite@ sprite = Sprite();
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sprite.texture = decalTex;
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// The UI root element is as big as the rendering window, set random position within it
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sprite.position = Vector2(Random() * width, Random() * height);
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// Set sprite size & hotspot in its center
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sprite.size = IntVector2(128, 128);
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sprite.hotSpot = IntVector2(64, 64);
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// Set random rotation in degrees and random scale
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sprite.rotation = Random() * 360.0f;
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sprite.SetScale(Random(1.0f) + 0.5f);
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// Set random color and additive blending mode
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sprite.color = Color(Random(0.5f) + 0.5f, Random(0.5f) + 0.5f, Random(0.5f) + 0.5f);
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sprite.blendMode = BLEND_ADD;
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// Add as a child of the root UI element
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ui.root.AddChild(sprite);
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// Store sprite's velocity as a custom variable
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sprite.vars["Velocity"] = Vector2(Random(200.0f) - 100.0f, Random(200.0f) - 100.0f);
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// Store sprites to our own container for easy movement update iteration
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sprites.Push(sprite);
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}
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}
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void MoveSprites(float timeStep)
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{
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float width = graphics.width;
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float height = graphics.height;
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// Go through all sprites
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for (uint i = 0; i < sprites.length; ++i)
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{
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Sprite@ sprite = sprites[i];
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// Rotate
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float newRot = sprite.rotation + timeStep * 30.0f;
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sprite.rotation = newRot;
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// Move, wrap around rendering window edges
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Vector2 newPos = sprite.position + sprite.vars["Velocity"].GetVector2() * timeStep;
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if (newPos.x < 0.0f)
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newPos.x += width;
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if (newPos.x >= width)
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newPos.x -= width;
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if (newPos.y < 0.0f)
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newPos.y += height;
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if (newPos.y >= height)
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newPos.y -= height;
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sprite.position = newPos;
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}
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}
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void SubscribeToEvents()
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{
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// Subscribe HandleUpdate() function for processing update events
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SubscribeToEvent("Update", "HandleUpdate");
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}
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void HandleUpdate(StringHash eventType, VariantMap& eventData)
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{
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// Take the frame time step, which is stored as a float
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float timeStep = eventData["TimeStep"].GetFloat();
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// Move sprites, scale movement with time step
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MoveSprites(timeStep);
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}
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// Create XML patch instructions for screen joystick layout specific to this sample app
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String patchInstructions =
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"<patch>" +
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" <add sel=\"/element/element[./attribute[@name='Name' and @value='Hat0']]\">" +
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" <attribute name=\"Is Visible\" value=\"false\" />" +
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" </add>" +
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"</patch>";
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