Entry 144

The target cursor turned and the drain gauge shaded: TRF and TG sprites

2026-09-26ui

Filescrates/piney-desktop/src/sprite.rscrates/piney-fieldui/src/render.rscrates/piney-game/src/session/tests/shrine.rsdocs/engine/field-ui.md

A GAPS drawing item. The menus' packets were right, and the harness compares them with the game. The drawing of two sprite types was not:

• The target cursor (targetCursol, SetPrim TRF) drew as a square where the game draws a diamond. Its middle cell turns by pi/4.
• The bracelet's gauge (menuDrain, TG) drew each cell in its first corner's colour. The game shades the virus cells between two colour pairs.

The game

ccSprite::MakePacketStr (main 0x0015aed0) makes both as a textured TRIANGLE_STRIP of four corners, where TF makes a SPRITE.

• The strip. The corners are (top left, bottom left, top right, bottom right), with the UV of each. Mirroring swaps the pairs as the sprite does.
• The rotated types (bit 0x2). The corner is RotZ(-rot) of (cx, cy) plus (dx, dy). The edges are the turned (sx, 0) and (0, sy). Each corner goes through ApplyLayerScreenMatrix. A cell is dropped only when all four corners are off the screen. dx and dy move on by the turned first edge, and a shadow moves the corner by the view's scales.
• The Gouraud types (bit 0x4). They send an RGBAQ before each UV and XYZ2, from the colour word pairs at +0x68, +0x78, +0x88 and +0x98 in corner order. Each alpha is multiplied by transp.

The minimap's second sprites had the rotated path already (piney-world map::sprite, bit-exact through the VU's cossin).

The port

piney_desktop::sprite::Sprite gains rot and vcol. make_packet draws either kind as the strip (make_strip), and TF stays the SPRITE it was. piney-fieldui's render sets rot for targetCursol and vcol from the packet.

• Unit tests. a_rotated_cell_is_a_turned_strip checks the diamond's corners and the turned step. a_gouraud_cell_keeps_its_corners checks the colours by corner.
• The picture. target_cursor_shot (ignored) walks Kite up to event 17's Administrator and saves the frames with him targeted. The diamond and its four corner marks are drawn as on the console.