ActionScript 3 mouse painting

This article uses AS3 to describe the curve, straight line, circle, ellipse, and rectangle. I hope this will help you! (1): curve knowledge points: 1. Add the mouse to listen to the event MouseEvent; 2. Specify the canvas size; 3. moveTo and lineTo; 4. Draw the start and end judgment. Code: var huabu: Sprite = new Sprite (); huabu. graphics. beginFill (0 xFFFFFF); huabu. graphics. drawRect (20, 20, 510,360); huabu. graphics. endFill (); addChild (huabu); var _ drawing: Boolean; var quxian: Sprite = new Sprite (); quxian. graphics. lineStyle (2, 0xFF0000); huabu. addChild (quxian); _ drawing = false; huabu. addEventListener (MouseEvent. MOUSE_DOWN, startDrawing); huabu. addEventListener (MouseEvent. MOUSE_MOVE, m Oving); huabu. addEventListener (MouseEvent. MOUSE_UP, stopDrawing); stage. addEventListener (MouseEvent. MOUSE_UP, stopDrawing); function startDrawing (event: MouseEvent): void {quxian. graphics. moveTo (mouseX, mouseY); _ drawing = true;} function moving (event: MouseEvent): void {if (_ drawing) {quxian. graphics. lineTo (mouseX, mouseY) ;}} function stopDrawing (event: MouseEvent): void {_ drawing = False;} (2): line knowledge point: 1. Add the mouse to listen to the event MouseEvent; 2. Specify the canvas size; 3. moveTo and lineTo; 4. Draw the start and end judgment. Difficulty: Draw multiple lines of code: var huabu: Sprite = new Sprite (); huabu. graphics. beginFill (0 xFFFFFF); huabu. graphics. drawRect (20, 20, 510,360); huabu. graphics. endFill (); addChild (huabu); var _ drawing: Boolean = false; var zhixian: Sprite = new Sprite (); huabu. addChild (zhixian); var _ color: Number = 0xFF0000; var zx: int = 1; var ys_x: Number; var ys_y: Number; huabu. addEventListener (MouseEvent. MOUSE_DOWN, startDrawing); huabu. addEvent Listener (MouseEvent. MOUSE_MOVE, moving); huabu. addEventListener (MouseEvent. MOUSE_UP, stopDrawing); stage. addEventListener (MouseEvent. MOUSE_UP, stopDrawing); function startDrawing (event: MouseEvent): void {ys_x = mouseX; ys_y = mouseY; _ drawing = true;} function moving (event: MouseEvent ): void {if (_ drawing) {huabu. removeChild (zhixian); zhixian = new Sprite (); zhixian. graphics. lineStyle (zx, _ col Or); zhixian. graphics. moveTo (ys_x, ys_y); zhixian. graphics. lineTo (mouseX, mouseY); huabu. addChild (zhixian) ;}} function stopDrawing (event: MouseEvent): void {zhixian = new Sprite (); huabu. addChild (zhixian); // you can draw only one straight line (_ drawing = false) without the preceding two sentences;} (3): Circle knowledge point: 1. Add the mouse to listen to the event MouseEvent; 2. display the radius (Point distance between two points) during painting. distance (coordinate 1, coordinate 2); 3. drawCircle, moveTo, and lineTo; 4. Draw start and end judgment. Difficulty: Draw multiple circles: var _ drawing: Boolean; var yuan: Sprite = new Sprite (); addChild (yuan); var banjing: Sprite = new Sprite (); addChild (banjing); var yuanxin_x: Number; var yuanxin_y: Number; var zuobiao1: Point; var zuobiao2: Point; var bj: Number; _ drawing = false; stage. addEventListener (MouseEvent. MOUSE_DOWN, startDrawing); stage. addEventListener (MouseEvent. MOUSE_MOVE, yd); stage. addEventListener (MouseEvent. MOUS E_UP, stopDrawing); function startDrawing (event: MouseEvent): void {yuanxin_x = mouseX; // The cursor is the center of the circle yuanxin_y = mouseY; _ drawing = true ;} function yd (event: MouseEvent): void {if (_ drawing) {zuobiao1 = new Point (yuanxin_x, yuanxin_y); zuobiao2 = new Point (mouseX, mouseY); bj = Point. distance (zuobiao1, zuobiao2); // the distance between two points is displayed as the radius removeChild (yuan); yuan = new Sprite (); yuan. graphics. lineStyle (2, 0xFF0000); yuan. graphics. drawCircle (yuanxin_x, yuanxin_y, bj); addChild (yuan); removeChild (banjing); banjing = new Sprite (); banjing. graphics. lineStyle (2, 0xFF0000, 0.5); banjing. graphics. moveTo (yuanxin_x, yuanxin_y); banjing. graphics. lineTo (mouseX, mouseY); addChild (banjing) ;}} function stopDrawing (event: MouseEvent): void {removeChild (banjing ); // The radius line disappears when the painting ends. banjing = new Sprite (); // The radius is displayed during each circle painting. addChil D (banjing); yuan = new Sprite (); // you can draw multiple circles addChild (yuan); _ drawing = false;} (4): elliptical knowledge point: 1. Add the mouse listening event MouseEvent and keyboard listening event KeyboardEvent; 2. width and height of the ellipse; 3. drawEllipse; 4. Draw start and end judgment; 5. Press Shift to draw a positive circle. Difficulty: press Shift to draw the positive circle code: var _ drawing: Boolean = false; var ellipse: Sprite = new Sprite (); addChild (ellipse); var kaishi_x: Number; var kaishi_y: number; var w: Number; var h: Number; var _ max: Number; stage. addEventListener (MouseEvent. MOUSE_DOWN, startDrawing); stage. addEventListener (MouseEvent. MOUSE_MOVE, moving); stage. addEventListener (MouseEvent. MOUSE_UP, stopDrawing); function startDrawing (event: MouseEven T): void {kaishi_x = mouseX; kaishi_y = mouseY; _ drawing = true;} function moving (event: MouseEvent): void {if (_ drawing) {w = mouseX-kaishi_x; h = mouseY-kaishi_y; removeChild (ellipse); ellipse = new Sprite (); ellipse. graphics. lineStyle (2, 0xFF0000); ellipse. graphics. drawEllipse (kaishi_x, kaishi_y, w, h); addChild (ellipse) ;}} function stopDrawing (event: MouseEvent): void {ellipse = new Sprite (); addChi Ld (ellipse); _ drawing = false;} stage. focus = this; stage. addEventListener (KeyboardEvent. KEY_DOWN, shift); function shift (event: KeyboardEvent): void {if (event. charCode = 0) {if (_ drawing) {w = mouseX-kaishi_x; h = mouseY-kaishi_y; _ max = Math. max (Math. abs (w), Math. abs (h); if (w <0 & h <0) {w =-_ max; h =-_ max ;} if (w> 0 & h> 0) {w = _ max; h = _ max;} if (w <0 & h> 0) {w =-_ max; h = _ max;} if (w> 0 & h <0) {w = _ Max; h =-_ max;} removeChild (ellipse); ellipse = new Sprite (); ellipse. graphics. lineStyle (2, 0xFF0000); ellipse. graphics. drawEllipse (kaishi_x, kaishi_y, w, h); addChild (ellipse) ;}}( 5): rectangular knowledge points: 1. Add a mouse listener event MouseEvent and a keyboard listener event KeyboardEvent; 2. width and height of the ellipse; 3. drawRect; 4. start and end of the painting; 5. Press Shift to draw a square. Difficulty: press Shift to draw the square code: var _ drawing: Boolean = false; var _ drawrect: Sprite = new Sprite (); addChild (_ drawrect); var yx_x: Number; var yx_y: Number; var w: Number; var h: Number; var _ max: Number; stage. addEventListener (MouseEvent. MOUSE_DOWN, startDrawing); stage. addEventListener (MouseEvent. MOUSE_MOVE, moving); stage. addEventListener (MouseEvent. MOUSE_UP, stopDrawing); function startDrawing (event: MouseEvent): void {yx_x = mouseX; yx_y = mouseY; _ drawing = true;} function moving (event: MouseEvent ): void {if (_ drawing) {w = mouseX-yx_x; h = mouseY-yx_y; removeChild (_ drawrect); _ drawrect = new Sprite (); _ drawrect. graphics. lineStyle (2, 0xFF0000); _ drawrect. graphics. drawRect (yx_x, yx_y, w, h); addChild (_ drawrect) ;}} function stopDrawing (event: MouseEvent): void {_ drawrect = new Sprite (); addChild (_ drawrect); _ drawing = false;} stage. focus = this; stage. addEventListener (KeyboardEvent. KEY_DOWN, shift); function shift (event: KeyboardEvent): void {if (event. charCode = 0) {if (_ drawing) {_ max = Math. max (Math. abs (w), Math. abs (h); if (w <0 & h <0) {w =-_ max; h =-_ max ;} if (w> 0 & h> 0) {w = _ max; h = _ max;} if (w <0 & h> 0) {w =-_ max; h = _ max;} if (w> 0 & h <0) {w = _ max; h =-_ max ;} removeChild (_ drawrect); _ drawrect = new Sprite (); _ drawrect. graphics. lineStyle (2, 0xFF0000); _ drawrect. graphics. drawRect (yx_x, yx_y, w, h); addChild (_ drawrect );}}}