feat: add bar series render

base_series.go

@@ -0,0 +1,121 @@
+// MIT License
+
+// Copyright (c) 2021 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"fmt"
+
+	"github.com/wcharczuk/go-chart/v2"
+)
+
+// Interface Assertions.
+var (
+	_ chart.Series              = (*BaseSeries)(nil)
+	_ chart.FirstValuesProvider = (*BaseSeries)(nil)
+	_ chart.LastValuesProvider  = (*BaseSeries)(nil)
+)
+
+// BaseSeries represents a line on a chart.
+type BaseSeries struct {
+	Name  string
+	Style chart.Style
+
+	YAxis chart.YAxisType
+
+	XValueFormatter chart.ValueFormatter
+	YValueFormatter chart.ValueFormatter
+
+	XValues []float64
+	YValues []float64
+}
+
+// GetName returns the name of the time series.
+func (cs BaseSeries) GetName() string {
+	return cs.Name
+}
+
+// GetStyle returns the line style.
+func (cs BaseSeries) GetStyle() chart.Style {
+	return cs.Style
+}
+
+// Len returns the number of elements in the series.
+func (cs BaseSeries) Len() int {
+	return len(cs.XValues)
+}
+
+// GetValues gets the x,y values at a given index.
+func (cs BaseSeries) GetValues(index int) (float64, float64) {
+	return cs.XValues[index], cs.YValues[index]
+}
+
+// GetFirstValues gets the first x,y values.
+func (cs BaseSeries) GetFirstValues() (float64, float64) {
+	return cs.XValues[0], cs.YValues[0]
+}
+
+// GetLastValues gets the last x,y values.
+func (cs BaseSeries) GetLastValues() (float64, float64) {
+	return cs.XValues[len(cs.XValues)-1], cs.YValues[len(cs.YValues)-1]
+}
+
+// GetValueFormatters returns value formatter defaults for the series.
+func (cs BaseSeries) GetValueFormatters() (x, y chart.ValueFormatter) {
+	if cs.XValueFormatter != nil {
+		x = cs.XValueFormatter
+	} else {
+		x = chart.FloatValueFormatter
+	}
+	if cs.YValueFormatter != nil {
+		y = cs.YValueFormatter
+	} else {
+		y = chart.FloatValueFormatter
+	}
+	return
+}
+
+// GetYAxis returns which YAxis the series draws on.
+func (cs BaseSeries) GetYAxis() chart.YAxisType {
+	return cs.YAxis
+}
+
+// Render renders the series.
+func (cs BaseSeries) Render(r chart.Renderer, canvasBox chart.Box, xrange, yrange chart.Range, defaults chart.Style) {
+	fmt.Println("should be override the function")
+}
+
+// Validate validates the series.
+func (cs BaseSeries) Validate() error {
+	if len(cs.XValues) == 0 {
+		return fmt.Errorf("continuous series; must have xvalues set")
+	}
+
+	if len(cs.YValues) == 0 {
+		return fmt.Errorf("continuous series; must have yvalues set")
+	}
+
+	if len(cs.XValues) != len(cs.YValues) {
+		return fmt.Errorf("continuous series; must have same length xvalues as yvalues")
+	}
+	return nil
+}