Add response time badge and chart

vendor/github.com/wcharczuk/go-chart/v2/drawing/graphic_context.go

@@ -0,0 +1,82 @@
+package drawing
+
+import (
+	"image"
+	"image/color"
+
+	"github.com/golang/freetype/truetype"
+)
+
+// GraphicContext describes the interface for the various backends (images, pdf, opengl, ...)
+type GraphicContext interface {
+	// PathBuilder describes the interface for path drawing
+	PathBuilder
+	// BeginPath creates a new path
+	BeginPath()
+	// GetMatrixTransform returns the current transformation matrix
+	GetMatrixTransform() Matrix
+	// SetMatrixTransform sets the current transformation matrix
+	SetMatrixTransform(tr Matrix)
+	// ComposeMatrixTransform composes the current transformation matrix with tr
+	ComposeMatrixTransform(tr Matrix)
+	// Rotate applies a rotation to the current transformation matrix. angle is in radian.
+	Rotate(angle float64)
+	// Translate applies a translation to the current transformation matrix.
+	Translate(tx, ty float64)
+	// Scale applies a scale to the current transformation matrix.
+	Scale(sx, sy float64)
+	// SetStrokeColor sets the current stroke color
+	SetStrokeColor(c color.Color)
+	// SetFillColor sets the current fill color
+	SetFillColor(c color.Color)
+	// SetFillRule sets the current fill rule
+	SetFillRule(f FillRule)
+	// SetLineWidth sets the current line width
+	SetLineWidth(lineWidth float64)
+	// SetLineCap sets the current line cap
+	SetLineCap(cap LineCap)
+	// SetLineJoin sets the current line join
+	SetLineJoin(join LineJoin)
+	// SetLineDash sets the current dash
+	SetLineDash(dash []float64, dashOffset float64)
+	// SetFontSize sets the current font size
+	SetFontSize(fontSize float64)
+	// GetFontSize gets the current font size
+	GetFontSize() float64
+	// SetFont sets the font for the context
+	SetFont(f *truetype.Font)
+	// GetFont returns the current font
+	GetFont() *truetype.Font
+	// DrawImage draws the raster image in the current canvas
+	DrawImage(image image.Image)
+	// Save the context and push it to the context stack
+	Save()
+	// Restore remove the current context and restore the last one
+	Restore()
+	// Clear fills the current canvas with a default transparent color
+	Clear()
+	// ClearRect fills the specified rectangle with a default transparent color
+	ClearRect(x1, y1, x2, y2 int)
+	// SetDPI sets the current DPI
+	SetDPI(dpi int)
+	// GetDPI gets the current DPI
+	GetDPI() int
+	// GetStringBounds gets pixel bounds(dimensions) of given string
+	GetStringBounds(s string) (left, top, right, bottom float64)
+	// CreateStringPath creates a path from the string s at x, y
+	CreateStringPath(text string, x, y float64) (cursor float64)
+	// FillString draws the text at point (0, 0)
+	FillString(text string) (cursor float64)
+	// FillStringAt draws the text at the specified point (x, y)
+	FillStringAt(text string, x, y float64) (cursor float64)
+	// StrokeString draws the contour of the text at point (0, 0)
+	StrokeString(text string) (cursor float64)
+	// StrokeStringAt draws the contour of the text at point (x, y)
+	StrokeStringAt(text string, x, y float64) (cursor float64)
+	// Stroke strokes the paths with the color specified by SetStrokeColor
+	Stroke(paths ...*Path)
+	// Fill fills the paths with the color specified by SetFillColor
+	Fill(paths ...*Path)
+	// FillStroke first fills the paths and than strokes them
+	FillStroke(paths ...*Path)
+}