Graphics Primitives : Subroutine Descriptions
Group GG : General Graphics
| IGrGetPixel | Get a screen pixel value as a 24-bit value |
| IGrInit | Re-initialise graphics output |
| IGrSelect | Select target drawing surface (window/bitmap/field/metafile) |
Group GA : Graphics Area/Units
| IGrArea | Define size of graphics area |
| IGrAreaClear | Clear the current graphics screen area |
| IGrUnits | Define plotting units to be used |
| IGrUnitsFromPixels | Convert to user-unit co-ordinate from a pixel co-ord |
| IGrUnitsToPixels | Convert from user-unit co-ordinate to a pixel co-ord |
| IGrViewport | Define size of graphics viewport |
Group GS : Graphics Style Selection
| IGrColour | Select graphics colour using a colour name |
| IGrColourModel | Select 8-bit or 24-bit colour model |
| IGrColourN | Select graphics colour using a colour number |
| IGrFillPattern | Define fill pattern (solid/stippled/hatched) |
| IGrLineType | Select line type (solid, dots, dashes, etc.) |
| IGrLineWidth | Set line width |
| IGrPalette | Redefine colour palette |
| IGrPaletteInit | Re-initialise palette |
| IGrPlotMode | Select plotting mode (normal/and/or/exclusive-or) |
Group GD : Graphics Drawing/Movement Primitives
| IGrArc | Draw/fill circular arc at an absolute position |
| IGrArcRel | Draw/fill circular arc at the current position |
| IGrArrow | Draw an arrow pointing to a specified position |
| IGrArrowJoin | Draw an arrow joining two points |
| IGrBlockCopy | Bit block copy |
| IGrBlockMove | Bit block move |
| IGrBorder | Draw border around current graphics area |
| IGrCircle | Draw/fill circle at an absolute position |
| IGrCircleRel | Draw/fill circle at the current position |
| IGrEllipse | Draw/fill an ellipse at an absolute position |
| IGrEllipseRel | Draw/fill an ellipse at the current position |
| IGrJoin | Draw line between two absolute plotting positions |
| IGrJoinRel | Draw line from absolute position to a relative pos |
| IGrLineTo | Draw line to a new absolute position |
| IGrLineToRel | Draw line to a new relative position |
| IGrMarker | Draw predefined marker at an absolute position |
| IGrMarkerRel | Draw predefined marker at the current position |
| IGrMoveTo | Move current plotting position to a new absolute pos |
| IGrMoveToRel | Move current plotting position to a new relative pos |
| IGrParallel | Draw/fill parallelogram given absolute co-ordinates |
| IGrParallelRel | Draw/fill parallelogram given height & width |
| IGrPoint | Draw a single point at new absolute position |
| IGrPointRel | Draw a single point at new relative position |
| IGrPolygonComplex | Draw/fill a complex (possibly intersecting) polygon |
| IGrPolygonGrad | Fill a horizontally/vertically graduated polygon |
| IGrPolygonShaded | Fill a shaded polygon, RGB value specified for each vertex |
| IGrPolygonSimple | Draw/fill a simple non-intersecting polygon |
| IGrPolyLine | Draw a polyline through a set of absolute co-ordinates |
| IGrRectangle | Draw/fill rectangle given absolute co-ordinates |
| IGrRectangleRel | Draw/fill rectangle given height & width |
| IGrTrapezium | Draw/fill trapezium given absolute co-ordinates |
| IGrTrapeziumRel | Draw/fill trapezium given height & width |
| IGrTriangle | Draw/fill triangle given absolute co-ordinates |
| IGrTriangleRel | Draw/fill triangle given two relative co-ordinates |
| WGrBezier | Draw a Bezier curve |
| WGrBezierPoints | Calculate and return the points of a Bezier curve |
| WGrBSpline | Draw a cubic B-Spline curve |
| WGrBSplinePoints | Calculate and return the points of a cubic B-Spline curve |
| WGrCurve | Draw a curve which passes through all the supplied points |
| WGrCurvePoints | Calculate and return the points of a coincident curve |
Group GP : Graphics Proximity Checks
| IGrDistanceLine | Measure distance from a point to a line |
| IGrInsideCircle | Is a given point inside a given circle? |
| IGrInsideEllipse | Is a given point inside a given ellipse? |
| IGrInsidePolygon | Is a given point inside a given polygon? |
| IGrIntersectLine | Calculate point at which two lines intersect |