82d1eb2fdb
Also changes the framework dart code to use the refactored APIs and fixes the various examples and tests. R=abarth@chromium.org, ianh@chromium.org Review URL: https://codereview.chromium.org/1190123003.
115 lines
3.3 KiB
Dart
115 lines
3.3 KiB
Dart
part of sprites;
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/// A Sprite is a [Node] that renders a bitmap image to the screen.
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class Sprite extends NodeWithSize {
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/// The texture that the sprite will render to screen.
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///
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/// If the texture is null, the sprite will be rendered as a red square
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/// marking the bounds of the sprite.
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///
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/// mySprite.texture = myTexture;
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Texture texture;
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/// If true, constrains the proportions of the image by scaling it down, if its proportions doesn't match the [size].
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///
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/// mySprite.constrainProportions = true;
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bool constrainProportions = false;
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double _opacity = 1.0;
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/// The color to draw on top of the sprite, null if no color overlay is used.
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///
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/// // Color the sprite red
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/// mySprite.colorOverlay = new Color(0x77ff0000);
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Color colorOverlay;
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/// The transfer mode used when drawing the sprite to screen.
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///
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/// // Add the colors of the sprite with the colors of the background
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/// mySprite.transferMode = TransferMode.plusMode;
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TransferMode transferMode;
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/// Creates a new sprite from the provided [texture].
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///
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/// var mySprite = new Sprite(myTexture)
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Sprite([this.texture]) {
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if (texture != null) {
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size = texture.size;
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pivot = texture.pivot;
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} else {
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pivot = new Point(0.5, 0.5);
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}
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}
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/// Creates a new sprite from the provided [image].
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///
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/// var mySprite = new Sprite.fromImage(myImage);
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Sprite.fromImage(Image image) {
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assert(image != null);
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texture = new Texture(image);
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size = texture.size;
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pivot = new Point(0.5, 0.5);
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}
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/// The opacity of the sprite in the range 0.0 to 1.0.
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///
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/// mySprite.opacity = 0.5;
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double get opacity => _opacity;
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void set opacity(double opacity) {
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assert(opacity != null);
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assert(opacity >= 0.0 && opacity <= 1.0);
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_opacity = opacity;
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}
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void paint(RenderCanvas canvas) {
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canvas.save();
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// Account for pivot point
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applyTransformForPivot(canvas);
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if (texture != null) {
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double w = texture.size.width;
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double h = texture.size.height;
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if (w <= 0 || h <= 0) return;
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double scaleX = size.width / w;
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double scaleY = size.height / h;
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if (constrainProportions) {
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// Constrain proportions, using the smallest scale and by centering the image
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if (scaleX < scaleY) {
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canvas.translate(0.0, (size.height - scaleX * h) / 2.0);
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scaleY = scaleX;
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} else {
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canvas.translate((size.width - scaleY * w) / 2.0, 0.0);
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scaleX = scaleY;
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}
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}
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canvas.scale(scaleX, scaleY);
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// Setup paint object for opacity and transfer mode
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Paint paint = new Paint();
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paint.color = new Color.fromARGB((255.0*_opacity).toInt(), 255, 255, 255);
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if (colorOverlay != null) {
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paint.setColorFilter(new ColorFilter.mode(colorOverlay, TransferMode.srcATop));
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}
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if (transferMode != null) {
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paint.setTransferMode(transferMode);
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}
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// Do actual drawing of the sprite
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canvas.drawImageRect(texture.image, texture.frame, texture.spriteSourceSize, paint);
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} else {
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// Paint a red square for missing texture
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canvas.drawRect(new Rect.fromLTRB(0.0, 0.0, size.width, size.height),
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new Paint()..color = const Color.fromARGB(255, 255, 0, 0));
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}
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canvas.restore();
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}
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}
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