Basic cursor

editor.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+	"math"
 	"os"
 	"path/filepath"
 
@@ -9,7 +11,8 @@ import (
 )
 
 const (
-	linesPerNode int = 100
+	linesPerNode = 100
+	textPadding  = 10
 )
 
 type Line struct {
@@ -26,8 +29,8 @@ type Editor struct {
 	FilePath     string
 	FileContents string
 
-	CursorX int
-	CursorY int
+	MouseX int
+	MouseY int
 
 	SelectionStart  int
 	SelectionLength int
@@ -39,14 +42,13 @@ type Editor struct {
 }
 
 func (e *Editor) SetCursorPos(x, y int) {
-	e.CursorX = x
-	e.CursorY = y
+	e.MouseX = x
+	e.MouseY = y
 }
 
 func (e *Editor) Render(drawStartPos, winSize *imgui.Vec2) {
 
-	e.CursorY = clampInt(e.CursorY, 0, e.LineCount)
-	e.CursorX = clampInt(e.CursorX, 0, e.GetLineCharCount(e.CursorY))
+	origDrawStartPos := *drawStartPos
 
 	//Draw window
 	imgui.SetNextWindowPos(*drawStartPos)
@@ -57,19 +59,40 @@ func (e *Editor) Render(drawStartPos, winSize *imgui.Vec2) {
 	imgui.PushStyleColor(imgui.StyleColorTextSelectedBg, settings.TextSelectionColor)
 
 	//Add padding to text
-	drawStartPos.X += 10
-	drawStartPos.Y += 10
+	drawStartPos.X += textPadding
+	drawStartPos.Y += textPadding
 
 	//Draw lines
 	lineHeight := imgui.TextLineHeightWithSpacing()
+	charWidth := imgui.CalcTextSize("a", false, 1000).X
 	linesToDraw := int(winSize.Y / lineHeight)
-	println("Lines to draw:", linesToDraw)
+	// println("Lines to draw:", linesToDraw)
+
+	cx := clampInt(e.MouseX-int(drawStartPos.X), 0, int(winSize.X))
+	cy := clampInt(e.MouseY-int(drawStartPos.Y), 0, int(winSize.Y))
+
+	clickedLine := clampInt(cy/int(lineHeight), 0, e.LineCount)
+	clickedCol := clampInt(cx/int(charWidth), 0, e.GetLineCharCount(clickedLine))
 
 	dl := imgui.WindowDrawList()
 	for i := 0; i < linesToDraw; i++ {
-		dl.AddText(*drawStartPos, imgui.PackedColorFromVec4(imgui.Vec4{X: 1, Y: 1, Z: 1, W: 1}), string(e.GetLine(e.CursorY+i).chars))
+		dl.AddText(*drawStartPos, imgui.PackedColorFromVec4(imgui.Vec4{X: 1, Y: 1, Z: 1, W: 1}), string(e.GetLine(0+i).chars))
 		drawStartPos.Y += lineHeight
 	}
+
+	fmt.Printf("line,col: %v,%v\n", clickedLine, clickedCol)
+
+	origDrawStartPos.X += textPadding
+	origDrawStartPos.Y += textPadding
+	lineStart := imgui.Vec2{
+		X: origDrawStartPos.X + float32(clickedCol)*charWidth,
+		Y: origDrawStartPos.Y + float32(clickedLine)*lineHeight - lineHeight*0.25,
+	}
+	lineEnd := imgui.Vec2{
+		X: origDrawStartPos.X + float32(clickedCol)*charWidth,
+		Y: origDrawStartPos.Y + float32(clickedLine)*lineHeight + lineHeight*0.75,
+	}
+	dl.AddLineV(lineStart, lineEnd, imgui.PackedColorFromVec4(imgui.Vec4{Z: 0.7, W: 1}), 5)
 }
 
 func (e *Editor) GetLine(lineNum int) *Line {
@@ -163,6 +186,10 @@ func clampInt(x, min, max int) int {
 	return x
 }
 
+func roundF32(x float32) float32 {
+	return float32(math.Round(float64(x)))
+}
+
 func NewScratchEditor() *Editor {
 
 	e := &Editor{

main.go

@@ -166,6 +166,11 @@ func (g *Gopad) Update() {
 		g.showErrorPopup()
 	}
 
+	if input.MouseClicked(sdl.BUTTON_LEFT) {
+		x, y := input.GetMousePos()
+		g.getActiveEditor().SetCursorPos(int(x), int(y))
+	}
+
 	//Close editor if needed
 	if input.KeyDown(sdl.K_LCTRL) && input.KeyClicked(sdl.K_w) {
 		g.closeEditor(g.activeEditor)