add default picture for image not exist

go.mod

@@ -1,3 +1,8 @@
 module github.com/tiechui1994/gopdf
 
 go 1.14
+
+require (
+	github.com/signintech/gopdf v0.9.8
+	golang.org/x/image v0.0.0-20200801110659-972c09e46d76
+)

go.sum

@@ -0,0 +1,10 @@
+github.com/phpdave11/gofpdi v1.0.8 h1:9HRg0Z0qDfWeMU7ska+YNQ13RHxTxqP5KTg/dBl4o7c=
+github.com/phpdave11/gofpdi v1.0.8/go.mod h1:vBmVV0Do6hSBHC8uKUQ71JGW+ZGQq74llk/7bXwjDoI=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/signintech/gopdf v0.9.8 h1:tafWEjYhorfHMl9JT9II43fvf5XhUwrjUKVNwQqqyJQ=
+github.com/signintech/gopdf v0.9.8/go.mod h1:MrARAC6LaOgbnV6vrC5885VuoWCXazhAqx8L8zmjYy4=
+golang.org/x/image v0.0.0-20200801110659-972c09e46d76 h1:U7GPaoQyQmX+CBRWXKrvRzWTbd+slqeSh8uARsIyhAw=
+golang.org/x/image v0.0.0-20200801110659-972c09e46d76/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

image.go

@@ -19,7 +19,8 @@ type Image struct {
 
 func NewImage(path string, pdf *core.Report) *Image {
 	if _, err := os.Stat(path); err != nil {
-		panic(fmt.Sprintf("the path error, %v", path))
+		path = fmt.Sprintf("/tmp/%v.png", time.Now().Unix())
+		DrawPNG(path)
 	}
 
 	dstPath := fmt.Sprintf("/tmp/%v.jpeg", time.Now().UnixNano())
@@ -55,7 +56,8 @@ func NewImageWithWidthAndHeight(path string, width, height float64, pdf *core.Re
 	}
 
 	if _, err := os.Stat(path); err != nil {
-		panic("the path error")
+		path = fmt.Sprintf("/tmp/%v.png", time.Now().Unix())
+		DrawPNG(path)
 	}
 
 	dstPath := fmt.Sprintf("/tmp/%v.jpeg", time.Now().UnixNano())

markdown_test.go

@@ -4,11 +4,11 @@ import (
 	"testing"
 	"io/ioutil"
 	"encoding/json"
-	"bytes"
-	"fmt"
 	"log"
 
 	"github.com/tiechui1994/gopdf/core"
+	"bytes"
+	"fmt"
 )
 
 func init() {
@@ -85,3 +85,7 @@ func TestTokens(t *testing.T) {
 		fmt.Printf("\n")
 	}
 }
+
+func TestDrawJPEG(t *testing.T) {
+	DrawPNG("./test.png")
+}

picture.go

@@ -13,6 +13,7 @@ import (
 	"golang.org/x/image/bmp"
 	"golang.org/x/image/webp"
 	"golang.org/x/image/tiff"
+	"math"
 )
 
 const (
@@ -178,8 +179,8 @@ func ConvertTIFF2JPEG(srcPath, dstPath string) (err error) {
 
 func DrawPNG(srcPath string) {
 	const (
-		width  = 300
-		height = 500
+		width  = 200
+		height = 200
 	)
 
 	// 文件
@@ -188,13 +189,21 @@ func DrawPNG(srcPath string) {
 
 	// Image, 进行绘图操作
 	pngImage := image.NewRGBA(image.Rect(0, 0, width, height))
-	for y := 0; y < height; y++ {
-		for x := 0; x < width; x++ {
+	draw.Draw(pngImage, pngImage.Bounds(), image.White, image.ZP, draw.Src)
 
-			pngImage.Set(x, y, color.RGBA{uint8(256 % (x + 1)), uint8(y % 256), uint8((x ^ y) % 256), uint8((x ^ y) % 256)})
-		}
+	a, b, c := 5.70, 7.0, 2.2
+	for p := 0.0; p <= 720.0; p += 0.03125 {
+		x := int(20*((a-b)*math.Cos(p)+c*math.Cos((a/b-1)*p))) + 100
+		y := int(20*((a-b)*math.Sin(p)-c*math.Sin((a/b-1)*p))) + 100
+
+		pngImage.Set(x, y, color.RGBA{
+			R: uint8(250),
+			G: uint8(4),
+			B: uint8(4),
+			A: uint8(255),
+		})
 	}
 
-	// 以png的格式写入文件
+	// 以 png 的格式写入文件
 	png.Encode(pngFile, pngImage)
 }