steffo/better-tee
steffo/better-tee
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Smooth lines

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This commit is contained in:
Steffo 2019-09-10 18:44:25 +02:00
parent 3238ab9ae6
commit 7c5beef670
6 changed files with 116 additions and 18 deletions
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2
Assets/Drawing/Drawable Frame/DrawableFrame.cs.meta
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@ -4,7 +4,7 @@ MonoImporter:
externalObjects: {}
serializedVersion: 2
defaultReferences: []
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105
Assets/Drawing/Drawable Frame/PencilTool.cs
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@ -4,9 +4,14 @@ using UnityEngine;
public class PencilTool : DrawTool
{
public Color color = Color.black;
public Color selectedColor = Color.black;
public float size = 1f;
protected Color[] colors;
private Vector2Int? previousPixel;
private Vector2Int? pixel;
protected Vector2Int? HoveredPixel() {
Vector2 worldPoint = Camera.main.ScreenToWorldPoint(Input.mousePosition);
if(frame.Bounds.Contains(worldPoint)) {
@ -19,31 +24,107 @@ public class PencilTool : DrawTool
protected override void Start() {
base.Start();
InvokeRepeating("Apply", 0.05f, 0.05f);
colors = frame.texture.GetPixels();
}
protected void Update() {
Color[] colors = frame.texture.GetPixels();
previousPixel = pixel;
if(Input.GetMouseButton(0)) {
Vector2Int? pixel = HoveredPixel();
pixel = HoveredPixel();
if(pixel.HasValue) {
int x_start = Mathf.Clamp(Mathf.CeilToInt((float)pixel.Value.x - size), 0, frame.resolution.x);
int x_end = Mathf.Clamp(Mathf.CeilToInt((float)pixel.Value.x + size), 0, frame.resolution.x);
int y_start = Mathf.Clamp(Mathf.CeilToInt((float)pixel.Value.y - size), 0, frame.resolution.y);
int y_end = Mathf.Clamp(Mathf.CeilToInt((float)pixel.Value.y + size), 0, frame.resolution.y);
for(int x = x_start; x < x_end; x++) {
for(int y = y_start; y < y_end; y++) {
if(Vector2Int.Distance(new Vector2Int(x, y), pixel.Value) < size) {
if(previousPixel.HasValue) {
DrawBresenhamsThickLine(previousPixel.Value, pixel.Value, size, selectedColor);
}
else {
DrawFilledCircle(pixel.Value, size, selectedColor);
}
}
Apply();
}
else {
pixel = null;
}
}
protected void DrawPixel(int x, int y, Color color) {
if(x < 0 || x >= frame.resolution.x || y < 0 || y >= frame.resolution.y) return;
colors[x + y*frame.resolution.x] = color;
}
protected void DrawCircleEightPoints(Vector2Int center, int x_radius, int y_radius, Color color) {
DrawPixel(center.x+x_radius, center.y+y_radius, color);
DrawPixel(center.x-x_radius, center.y+y_radius, color);
DrawPixel(center.x+x_radius, center.y-y_radius, color);
DrawPixel(center.x-x_radius, center.y-y_radius, color);
DrawPixel(center.x+y_radius, center.y+x_radius, color);
DrawPixel(center.x-y_radius, center.y+x_radius, color);
DrawPixel(center.x+y_radius, center.y-x_radius, color);
DrawPixel(center.x-y_radius, center.y-x_radius, color);
}
// No idea on how does it work
// https://www.geeksforgeeks.org/bresenhams-circle-drawing-algorithm/
protected void DrawBresenhamEmptyCircle(Vector2Int center, int radius, Color color) {
int x = 0;
int y = radius;
int d = 3 - 2 * radius;
DrawCircleEightPoints(center, x, y, color);
while(y >= x) {
x++;
if(d > 0) {
y--;
d = d + 4 * (x - y) + 10;
}
else {
d = d + 4 * x + 6;
}
DrawCircleEightPoints(center, x, y, color);
}
}
protected void DrawFilledCircle(Vector2Int center, float radius, Color color) {
int x_start = Mathf.CeilToInt((float)center.x - radius);
int x_end = Mathf.CeilToInt((float)center.x + radius);
int y_start = Mathf.CeilToInt((float)center.y - radius);
int y_end = Mathf.CeilToInt((float)center.y + radius);
for(int x = x_start; x < x_end; x++) {
for(int y = y_start; y < y_end; y++) {
if(Vector2Int.Distance(new Vector2Int(x, y), center) < radius) {
DrawPixel(x, y, color);
}
}
}
}
frame.texture.SetPixels(colors);
// http://www.roguebasin.com/index.php?title=Bresenham%27s_Line_Algorithm
protected void DrawBresenhamsThickLine(Vector2Int start, Vector2Int end, float radius, Color color) {
int start_x = start.x, start_y = start.y, end_x = end.x, end_y = end.y;
bool steep = Mathf.Abs(end_y - start_y) > Mathf.Abs(end_x - start_x);
if (steep) {
Utils.Swap<int>(ref start_x, ref start_y);
Utils.Swap<int>(ref end_x, ref end_y);
}
if (start_x > end_x) {
Utils.Swap<int>(ref start_x, ref end_x);
Utils.Swap<int>(ref start_y, ref end_y);
}
int dX = (end_x - start_x), dY = Mathf.Abs(end_y - start_y), err = (dX / 2), ystep = (start_y < end_y ? 1 : -1), y = start_y;
for (int x = start_x; x <= end_x; ++x)
{
if(steep) {
DrawFilledCircle(new Vector2Int(y, x), radius, color);
}
else {
DrawFilledCircle(new Vector2Int(x, y), radius, color);
}
err = err - dY;
if (err < 0) { y += ystep; err += dX; }
}
}
protected void Apply() {
frame.texture.SetPixels(colors);
frame.texture.Apply();
}
}

2
Assets/Drawing/Drawable Frame/SetSpriteFromDrawableFrame.cs.meta
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@ -4,7 +4,7 @@ MonoImporter:
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2
Assets/Drawing/PencilColorFromButtonColor.cs
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@ -16,6 +16,6 @@ public class PencilColorFromButtonColor : MonoBehaviour
public void OnClick()
{
pencil.color = image.color;
pencil.selectedColor = image.color;
}
}

6
Assets/Swap.cs Normal file
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@ -0,0 +1,6 @@
public class Utils {
public static void Swap<T>(ref T lhs, ref T rhs) {
T temp; temp = lhs; lhs = rhs; rhs = temp;
}
}

11
Assets/Swap.cs.meta Normal file
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