diff options
Diffstat (limited to 'html/examples')
| -rw-r--r-- | html/examples/show_image_touch.wlua | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/html/examples/show_image_touch.wlua b/html/examples/show_image_touch.wlua index eaa9d7e..7e1575f 100644 --- a/html/examples/show_image_touch.wlua +++ b/html/examples/show_image_touch.wlua @@ -72,8 +72,9 @@ function cnv:multitouch_cb(count, pid, px, py, pstatus) if (pstatus[1] == 68 or pstatus[2] == 68) then -- 'D' DOWN diff_x = math.abs(px[2]-px[1]) diff_y = math.abs(py[2]-py[1]) - ref_x = (px[2]+px[1])/2 - ref_y = (py[2]+py[1])/2 + ref_x = img_x+img_w/2 -- center of the image as reference + ref_y = img_y+img_h/2 + old_angle = math.atan2(py[2]-py[1], px[2]-px[1]) zoom = 1 elseif (pstatus[1] == 85 or pstatus[2] == 85) then -- 'U' UP if (zoom == 1) then @@ -84,6 +85,7 @@ function cnv:multitouch_cb(count, pid, px, py, pstatus) -- zoom local new_diff_x = math.abs(px[2]-px[1]) local new_diff_y = math.abs(py[2]-py[1]) + local angle = math.atan2(py[2]-py[1], px[2]-px[1]) local abs_diff_x = new_diff_x-diff_x local abs_diff_y = new_diff_y-diff_y @@ -97,6 +99,10 @@ function cnv:multitouch_cb(count, pid, px, py, pstatus) local prev_h = img_h img_w = img_w + diff img_h = img_h + diff + + local str = string.format("%g %d %d", -(angle-old_angle)*cd.RAD2DEG, ref_x, ref_y) + print("ROTATE=", str) + canvas:SetAttribute("ROTATE", str) -- translate to maintain fixed the reference point local orig_x = ref_x - img_x |