how to add functions to CanvasRenderingContext2D prototype in typescript
I want to add a function on CanvasRenderingContext2D. what it does is to draw a circle text.
in javascript, all I need to do is write code like this:
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
however it desen't work in typescript.
I also try these two methods:
1.
add following code at the file header
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
2.
add this line in lib.dom.d.ts
interface CanvasRenderingContext2D extends CanvasState, CanvasTransform, CanvasCompositing, CanvasImageSmoothing, CanvasFillStrokeStyles, CanvasShadowStyles, CanvasFilters, CanvasRect, CanvasDrawPath, CanvasUserInterface, CanvasText, CanvasDrawImage, CanvasImageData, CanvasPathDrawingStyles, CanvasTextDrawingStyles, CanvasPath {
readonly canvas: HTMLCanvasElement;
fillTextCircle: any; //add this line in lib.dom.d.ts
}
but it still complains this error:
Property 'fillTextCircle' does not exist on type
'CanvasRenderingContext2D'.
javascript typescript
edited Nov 21 '18 at 7:01
Julian Stark
1,2681326
asked Nov 21 '18 at 3:09
JohnJohn
70111
add a comment |
I want to add a function on CanvasRenderingContext2D. what it does is to draw a circle text.
in javascript, all I need to do is write code like this:
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
however it desen't work in typescript.
I also try these two methods:
1.
add following code at the file header
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
2.
add this line in lib.dom.d.ts
interface CanvasRenderingContext2D extends CanvasState, CanvasTransform, CanvasCompositing, CanvasImageSmoothing, CanvasFillStrokeStyles, CanvasShadowStyles, CanvasFilters, CanvasRect, CanvasDrawPath, CanvasUserInterface, CanvasText, CanvasDrawImage, CanvasImageData, CanvasPathDrawingStyles, CanvasTextDrawingStyles, CanvasPath {
readonly canvas: HTMLCanvasElement;
fillTextCircle: any; //add this line in lib.dom.d.ts
}
but it still complains this error:
Property 'fillTextCircle' does not exist on type
'CanvasRenderingContext2D'.
javascript typescript
edited Nov 21 '18 at 7:01
Julian Stark
1,2681326
asked Nov 21 '18 at 3:09
JohnJohn
70111
1
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44
add a comment |
I want to add a function on CanvasRenderingContext2D. what it does is to draw a circle text.
in javascript, all I need to do is write code like this:
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
however it desen't work in typescript.
I also try these two methods:
1.
add following code at the file header
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
2.
add this line in lib.dom.d.ts
interface CanvasRenderingContext2D extends CanvasState, CanvasTransform, CanvasCompositing, CanvasImageSmoothing, CanvasFillStrokeStyles, CanvasShadowStyles, CanvasFilters, CanvasRect, CanvasDrawPath, CanvasUserInterface, CanvasText, CanvasDrawImage, CanvasImageData, CanvasPathDrawingStyles, CanvasTextDrawingStyles, CanvasPath {
readonly canvas: HTMLCanvasElement;
fillTextCircle: any; //add this line in lib.dom.d.ts
}
but it still complains this error:
Property 'fillTextCircle' does not exist on type
'CanvasRenderingContext2D'.
javascript typescript
edited Nov 21 '18 at 7:01
Julian Stark
1,2681326
asked Nov 21 '18 at 3:09
JohnJohn
70111
I want to add a function on CanvasRenderingContext2D. what it does is to draw a circle text.
in javascript, all I need to do is write code like this:
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
however it desen't work in typescript.
I also try these two methods:
1.
add following code at the file header
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
2.
add this line in lib.dom.d.ts
interface CanvasRenderingContext2D extends CanvasState, CanvasTransform, CanvasCompositing, CanvasImageSmoothing, CanvasFillStrokeStyles, CanvasShadowStyles, CanvasFilters, CanvasRect, CanvasDrawPath, CanvasUserInterface, CanvasText, CanvasDrawImage, CanvasImageData, CanvasPathDrawingStyles, CanvasTextDrawingStyles, CanvasPath {
readonly canvas: HTMLCanvasElement;
fillTextCircle: any; //add this line in lib.dom.d.ts
}
but it still complains this error:
Property 'fillTextCircle' does not exist on type
'CanvasRenderingContext2D'.
javascript typescript
javascript typescript
edited Nov 21 '18 at 7:01
Julian Stark
1,2681326
asked Nov 21 '18 at 3:09
JohnJohn
70111
edited Nov 21 '18 at 7:01
Julian Stark
1,2681326
asked Nov 21 '18 at 3:09
JohnJohn
70111
edited Nov 21 '18 at 7:01
Julian Stark
1,2681326
edited Nov 21 '18 at 7:01
Julian Stark
1,2681326
edited Nov 21 '18 at 7:01
Julian Stark
1,2681326
1,2681326
asked Nov 21 '18 at 3:09
JohnJohn
70111
asked Nov 21 '18 at 3:09
JohnJohn
70111
asked Nov 21 '18 at 3:09
JohnJohn
70111
70111
1
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44
add a comment |
1
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44
1
1
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44
add a comment |
1 Answer
1
active
oldest
votes
just add a global.d.ts,and add the following code:
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
It will work
link question
answered Nov 21 '18 at 6:46
JohnJohn
70111
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53404740%2fhow-to-add-functions-to-canvasrenderingcontext2d-prototype-in-typescript%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
just add a global.d.ts,and add the following code:
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
It will work
link question
answered Nov 21 '18 at 6:46
JohnJohn
70111
add a comment |
just add a global.d.ts,and add the following code:
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
It will work
link question
answered Nov 21 '18 at 6:46
JohnJohn
70111
add a comment |
just add a global.d.ts,and add the following code:
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
It will work
link question
answered Nov 21 '18 at 6:46
JohnJohn
70111
just add a global.d.ts,and add the following code:
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
It will work
link question
answered Nov 21 '18 at 6:46
JohnJohn
70111
answered Nov 21 '18 at 6:46
JohnJohn
70111
answered Nov 21 '18 at 6:46
JohnJohn
70111
answered Nov 21 '18 at 6:46
JohnJohn
70111
70111
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53404740%2fhow-to-add-functions-to-canvasrenderingcontext2d-prototype-in-typescript%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44