gpdf

Generate PDF using high-level objects (text, lines, curves, shapes) using a percentage-based coordinate system.

Placemat

Initialize

canvas, err := SetupCanvas(width, height float64) (*Canvas, error)

Set page background

(c *Canvas) Background(color string)

Line between (x0,y0) and (x1, y1)

(c *Canvas) Line(x0, y0, x1, y1, size float64, color string, opacity ...float64)

Filled circle centered at (x,y) with radius r

(c *Canvas) Circle(x, y, r float64, color string, opacity ...float64)

Filled ellipse centered at (x,y), dimensions (w,h)

(c *Canvas) Ellipse(x, y, w, h float64, color string, opacity ...float64)

Filled rectangle upper left corner at (x,y), dimensions (w,h)

(c *Canvas) CornerRect(x, y, w, h float64, color string, opacity ...float64)

Filled rectangle centered at (x,y), dimensions (w,h)

(c *Canvas) Rect(x, y, w, h float64, color string, opacity ...float64)

Gradient filled rectangle

(c *Canvas) GradRect(x, y, w, h float64, color1 string, color2 string, percent float64)

Filled square centered at (x,y), both sized are w.

(c *Canvas) Square(x,y, w, float64 color string, opacity ...float64)

Text beginning at (x,y) at the specified size and color

(c *Canvas) Text(x, y, size float64, s string, color string, opacity ...float64)

(c *Canvas) BText(x, y, size float64, s string, color string, opacity ...float64)

Text centered at (x,y) at the specified size and color

(c *Canvas) CText(x, y, size float64, s string, color string, opacity ...float64)

Text end-aligned at (x,y) at the specified size and color

(c *Canvas) EText(x, y, size float64, s string, color string, opacity ...float64)

Rotated text at the specified angle, anchored at (x,y), with the specified size and color

(c *Canvas) RText(x, y, size, angle float64, s string, color string, opacity ...float64)

Filled polygon with specified coordinates

(c *Canvas) Polygon(x, y []float64, color string, opacity ...float64)

Stroked polyline with specified coordinates

(c *Canvas) Polyline(x, y []float64, size, color string, opacity ...float64)

Cubic Bezier curve; begin (bx,by), control1 (cx1,cy1), control2 (cx2,cy2), end (ex,ey), with specifed stroke size and color

(c *Canvas) CubicCurve(bx, by, cx1, cy1, cx2, cy2, ex, ey, size float64, strokecolor string, opacity ...float64)

Quadradic Bezier curve; begin (bx,by), control (cx,cy), end (ex,ey), with specifed stroke size and color

(c *Canvas) QuadCurve(bx, by, cx, cy, ex, ey, size float64, color string, opacity ...float64)

Circular arc; center at (x,y), radius r, between angles a1 and s2 (degrees), with specifed stroke size and color

(c *Canvas) Arc(x, y, r, a1, a2, size float64, fillcolor string, opacity ...float64)

Image centered at (x,y), dimensions (w, h)

(c *Canvas) ImageName(x, y, w, h float64, name string)

Plain and labeled grids between (xmin,ymin) and (xmax,ymax) at the specified increment, using specified size and color

(c *Canvas) Grid(xmin, xmax, ymin, ymax, size, incr float64, color string)

(c *Canvas) LGrid(xmin, xmax, ymin, ymax, size, incr float64, color string, opacity ...float64)

hello, world