worked without scaling!!
This commit is contained in:
parent
7cb416041d
commit
cb5c2df263
3 changed files with 53 additions and 6 deletions
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@ -149,8 +149,7 @@ func (rgc *RasterGraphicContext) CreateStringPath(s string, x, y float64) (curso
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return
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}
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// GetStringBounds returns the approximate points bounds of a string.
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// It will be required to convert points to pixels for measurement.
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// GetStringBounds returns the approximate pixel bounds of a string.
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func (rgc *RasterGraphicContext) GetStringBounds(s string) (left, top, right, bottom float64, err error) {
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f := rgc.GetFont()
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if f == nil {
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@ -132,10 +132,8 @@ func (rr *rasterRenderer) MeasureText(body string) (width int, height int) {
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if err != nil {
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return
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}
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dw := r - l
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dh := b - t
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width = int(drawing.PointsToPixels(rr.gc.GetDPI(), dw))
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height = int(drawing.PointsToPixels(rr.gc.GetDPI(), dh))
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width = int(r - l)
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height = int(b - t)
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return
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}
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@ -5,6 +5,7 @@ import (
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"net/http"
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"github.com/wcharczuk/go-chart"
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"github.com/wcharczuk/go-chart/drawing"
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"github.com/wcharczuk/go-web"
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)
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@ -83,6 +84,54 @@ func chartHandler(rc *web.RequestContext) web.ControllerResult {
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return nil
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}
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func measureTestHandler(rc *web.RequestContext) web.ControllerResult {
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format, err := rc.RouteParameter("format")
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if err != nil {
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format = "png"
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}
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if format == "png" {
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rc.Response.Header().Set("Content-Type", "image/png")
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} else {
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rc.Response.Header().Set("Content-Type", "image/svg+xml")
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}
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var r chart.Renderer
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if format == "png" {
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r, err = chart.PNG(512, 512)
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} else {
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r, err = chart.SVG(512, 512)
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}
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if err != nil {
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return rc.API().InternalError(err)
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}
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f, err := chart.GetDefaultFont()
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if err != nil {
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return rc.API().InternalError(err)
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}
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r.SetDPI(96)
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r.SetFont(f)
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r.SetFontSize(24.0)
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r.SetFontColor(drawing.ColorBlack)
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r.SetStrokeColor(drawing.ColorBlack)
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tx, ty := 64, 64
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tw, th := r.MeasureText("test")
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r.MoveTo(tx, ty)
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r.LineTo(tx+tw, ty)
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r.LineTo(tx+tw, ty-th)
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r.LineTo(tx, ty-th)
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r.LineTo(tx, ty)
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r.Stroke()
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r.Text("test", tx, ty)
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r.Save(rc.Response)
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return nil
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}
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func main() {
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app := web.New()
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app.SetName("Chart Test Server")
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@ -92,5 +141,6 @@ func main() {
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app.GET("/favico.ico", func(rc *web.RequestContext) web.ControllerResult {
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return rc.Raw([]byte{})
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})
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app.GET("/measure", measureTestHandler)
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log.Fatal(app.Start())
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}
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