package drawing import ( "image/color" "git.gutmet.org/golang-freetype.git/truetype" ) // FillRule defines the type for fill rules type FillRule int const ( // FillRuleEvenOdd determines the "insideness" of a point in the shape // by drawing a ray from that point to infinity in any direction // and counting the number of path segments from the given shape that the ray crosses. // If this number is odd, the point is inside; if even, the point is outside. FillRuleEvenOdd FillRule = iota // FillRuleWinding determines the "insideness" of a point in the shape // by drawing a ray from that point to infinity in any direction // and then examining the places where a segment of the shape crosses the ray. // Starting with a count of zero, add one each time a path segment crosses // the ray from left to right and subtract one each time // a path segment crosses the ray from right to left. After counting the crossings, // if the result is zero then the point is outside the path. Otherwise, it is inside. FillRuleWinding ) // LineCap is the style of line extremities type LineCap int const ( // RoundCap defines a rounded shape at the end of the line RoundCap LineCap = iota // ButtCap defines a squared shape exactly at the end of the line ButtCap // SquareCap defines a squared shape at the end of the line SquareCap ) // LineJoin is the style of segments joint type LineJoin int const ( // BevelJoin represents cut segments joint BevelJoin LineJoin = iota // RoundJoin represents rounded segments joint RoundJoin // MiterJoin represents peaker segments joint MiterJoin ) // StrokeStyle keeps stroke style attributes // that is used by the Stroke method of a Drawer type StrokeStyle struct { // Color defines the color of stroke Color color.Color // Line width Width float64 // Line cap style rounded, butt or square LineCap LineCap // Line join style bevel, round or miter LineJoin LineJoin // offset of the first dash DashOffset float64 // array represented dash length pair values are plain dash and impair are space between dash // if empty display plain line Dash []float64 } // SolidFillStyle define style attributes for a solid fill style type SolidFillStyle struct { // Color defines the line color Color color.Color // FillRule defines the file rule to used FillRule FillRule } // Valign Vertical Alignment of the text type Valign int const ( // ValignTop top align text ValignTop Valign = iota // ValignCenter centered text ValignCenter // ValignBottom bottom aligned text ValignBottom // ValignBaseline align text with the baseline of the font ValignBaseline ) // Halign Horizontal Alignment of the text type Halign int const ( // HalignLeft Horizontally align to left HalignLeft = iota // HalignCenter Horizontally align to center HalignCenter // HalignRight Horizontally align to right HalignRight ) // TextStyle describe text property type TextStyle struct { // Color defines the color of text Color color.Color // Size font size Size float64 // The font to use Font *truetype.Font // Horizontal Alignment of the text Halign Halign // Vertical Alignment of the text Valign Valign } // ScalingPolicy is a constant to define how to scale an image type ScalingPolicy int const ( // ScalingNone no scaling applied ScalingNone ScalingPolicy = iota // ScalingStretch the image is stretched so that its width and height are exactly the given width and height ScalingStretch // ScalingWidth the image is scaled so that its width is exactly the given width ScalingWidth // ScalingHeight the image is scaled so that its height is exactly the given height ScalingHeight // ScalingFit the image is scaled to the largest scale that allow the image to fit within a rectangle width x height ScalingFit // ScalingSameArea the image is scaled so that its area is exactly the area of the given rectangle width x height ScalingSameArea // ScalingFill the image is scaled to the smallest scale that allow the image to fully cover a rectangle width x height ScalingFill ) // ImageScaling style attributes used to display the image type ImageScaling struct { // Horizontal Alignment of the image Halign Halign // Vertical Alignment of the image Valign Valign // Width Height used by scaling policy Width, Height float64 // ScalingPolicy defines the scaling policy to applied to the image ScalingPolicy ScalingPolicy }