insightdock::charts::DrawTarget

Pixel-space drawing surface shared by all built-in charts.

Synopsis

Declared in <insightdock/draw_target.h>

class DrawTarget;

Types

Name
`Point`

Member Functions

Name	Description
`~DrawTarget` [destructor] [virtual]	Destructor
`clear` [virtual]	Fill the whole surface with `color.`
`draw_dashed_line` [virtual]	Dashed segment; an empty `dash` draws a solid line.
`draw_dashed_polyline` [virtual]	Dashed polyline with the dash phase carried across vertices.
`draw_line` [virtual]
`draw_polygon_outline` [virtual]
`draw_polyline` [virtual]
`draw_text` [virtual]	Draw UTF-8 text using `font's` size, anchored per `align` / `baseline.`
`draw_text_rotated_ccw` [virtual]	Text rotated 90° counter-clockwise (reads bottom-to-top), centered on (cx, cy).
`draw_text_rotated_cw` [virtual]	Text rotated 90° clockwise (reads top-to-bottom), centered on (cx, cy).
`fill_circle` [virtual]
`fill_polygon` [virtual]	Fill a polygon (area charts rely on concave polygons being filled correctly).
`fill_rect` [virtual]
`fill_rounded_rect` [virtual]
`fill_sector` [virtual]	Fill a clockwise circular sector; angles are radians from the positive x-axis.
`height` [virtual]	Surface height in chart pixels.
`width` [virtual]	Surface width in chart pixels.

Non-Member Functions

Name	Description
`detail::draw_marker`	Draws a single point marker of the given shape, centered at (x, y).
`detail::draw_text_lines`	Draws possibly multi-line text, aligning each line independently.
`detail::fill_bar`	Fills one bar rectangle, optionally rounded and/or bordered.

Derived Classes

Name	Description
`RasterTarget`	`DrawTarget` that paints into an `ImageBuffer` (the original raster path).
`ScaledTarget`
`SvgTarget`	`DrawTarget` that records native SVG elements (`<rect>`, `<path>`, `<text>`…).

Description

Coordinates are in chart pixels with the origin at the top-left and y growing downwards. The same chart code drives every output: RasterTarget paints an ImageBuffer, while the SVG and PDF targets record vector primitives. Text is always measured with the embedded Font so layout is identical across targets; vector targets emit real text objects instead of glyph bitmaps.