149 lines
4.3 KiB
Objective-C
149 lines
4.3 KiB
Objective-C
// Copyright (c) 2024 Tencent. All rights reserved.
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// Author: eddardliu
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#import "TUIMultimediaGraffitiDrawView.h"
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#import <Masonry/Masonry.h>
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#import "TUIMultimediaPlugin/TUIMultimediaColorPanel.h"
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#import "TUIMultimediaPlugin/TUIMultimediaCommon.h"
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#import "TUIMultimediaPlugin/TUIMultimediaGeometry.h"
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#import "TUIMultimediaPlugin/TUIMultimediaDrawView.h"
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#define GRAFFITI_LINE_WIDTH 4
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#define CGPointMultiply(point, scalar) CGPointMake(point.x * scalar, point.y * scalar)
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@interface TUIMultimediaGraffitiDrawView () {
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NSMutableArray<NSValue *> *_currentPathPoints;
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UIBezierPath *_currentPath;
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NSMutableArray<TUIMultimediaPath *> *_pathList;
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NSMutableArray<TUIMultimediaPath *> *_redoPathList;
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}
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@end
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@implementation TUIMultimediaGraffitiDrawView
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- (id)initWithFrame:(CGRect)frame {
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self = [super initWithFrame:frame];
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if (self != nil) {
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self.backgroundColor = UIColor.clearColor;
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_pathList = [NSMutableArray array];
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_redoPathList = [NSMutableArray array];
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_currentPathPoints = [NSMutableArray array];
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_color = UIColor.whiteColor;
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}
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return self;
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}
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- (NSInteger) pathCount {
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return _pathList.count;
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}
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- (BOOL)canUndo {
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return _pathList.count != 0;
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}
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- (BOOL)canRedo {
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return _redoPathList.count != 0;
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}
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- (void)clearGraffiti {
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[_pathList removeAllObjects];
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[_redoPathList removeAllObjects];
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[_currentPath removeAllPoints];
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[_currentPathPoints removeAllObjects];
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[self setNeedsDisplay];
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}
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- (void)undo {
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if (_pathList.count == 0) {
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return;
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}
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TUIMultimediaPath *path = [_pathList lastObject];
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[_pathList removeLastObject];
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[_redoPathList addObject:path];
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[self setNeedsDisplay];
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}
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- (void)redo {
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if (_redoPathList.count == 0) {
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return;
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}
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TUIMultimediaPath *path = [_redoPathList lastObject];
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[_redoPathList removeLastObject];
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[_pathList addObject:path];
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[self setNeedsDisplay];
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}
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- (void)drawRect:(CGRect)rect {
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[super drawRect:rect];
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[[UIColor clearColor] setFill];
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UIRectFill(rect);
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for (TUIMultimediaPath *path in _pathList) {
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[path.color set];
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CGFloat scale = self.frame.size.width / path.originCanvasSize.width;
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UIBezierPath * bezierPath = [TUIMultimediaGraffitiDrawView smoothBezierPathFromPoints:path.pathPoints scale:scale];
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[bezierPath stroke];
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}
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if (_currentPath != nil) {
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[_color set];
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[_currentPath stroke];
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}
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}
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- (NSArray<TUIMultimediaPath *> *)pathList {
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return _pathList;
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}
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- (void)addPathPoint:(CGPoint) point {
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[_currentPathPoints addObject:@(point)];
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_currentPath = [TUIMultimediaGraffitiDrawView smoothBezierPathFromPoints:_currentPathPoints scale:1.0];
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[self setNeedsDisplay];
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}
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- (void)completeAddPoint {
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TUIMultimediaPath *path = [[TUIMultimediaPath alloc] init];
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path.pathPoints = [[NSMutableArray alloc] initWithArray:_currentPathPoints copyItems:YES];
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path.color = _color;
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path.originCanvasSize = self.frame.size;
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[_pathList addObject:path];
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[_redoPathList removeAllObjects];
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[_currentPathPoints removeAllObjects];
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_currentPath = nil;
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}
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+ (UIBezierPath *)smoothBezierPathFromPoints:(NSMutableArray<NSValue *> *) pathPoints scale:(CGFloat)scale{
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UIBezierPath *path = [UIBezierPath bezierPath];
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path.lineCapStyle = kCGLineCapRound;
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path.lineJoinStyle = kCGLineJoinRound;
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path.lineWidth = GRAFFITI_LINE_WIDTH * scale;
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if (pathPoints.count <= 1) {
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return nil;
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}
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[path moveToPoint:CGPointMultiply(pathPoints.firstObject.CGPointValue, scale)];
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if (pathPoints.count == 2) {
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[path addLineToPoint:CGPointMultiply(pathPoints.lastObject.CGPointValue,scale)];
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return path;
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}
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for (int i = 3; i < pathPoints.count; i++) {
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CGPoint p = CGPointMultiply(pathPoints[i].CGPointValue, scale);
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CGPoint prev = CGPointMultiply(pathPoints[i - 1].CGPointValue, scale);
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CGPoint midPoint = Vec2Mul(Vec2AddVector(p, prev), 0.5);
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[path addQuadCurveToPoint:midPoint controlPoint:prev];
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}
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[path addLineToPoint:CGPointMultiply(pathPoints.lastObject.CGPointValue, scale)];
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return path;
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}
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@end
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@implementation TUIMultimediaPath
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- (instancetype)init {
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self = [super init];
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_color = UIColor.clearColor;
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return self;
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}
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@end
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